mirror of
https://git.savannah.gnu.org/git/parallel.git
synced 2024-11-22 05:57:54 +00:00
Added comments for return statements
This commit is contained in:
Ole Tange
parent
9fd660be71
commit
c8c60db5bf
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@ -1,3 +1,5 @@
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TODO CaMelCase removal
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# Hvordan udregnes system limits på remote systems hvis jeg ikke ved, hvormange
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# argumenter, der er? Lav system limits lokalt og lad det være max
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156
src/parallel
156
src/parallel
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@ -1617,6 +1617,7 @@ if($::opt_halt_on_error) {
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}
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sub parse_options {
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# Returns: N/A
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# Defaults:
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$Global::version = 20100620;
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$Global::progname = 'parallel';
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@ -1801,6 +1802,7 @@ sub parse_options {
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}
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sub cleanup {
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# Returns: N/A
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if(@::opt_basefile) {
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cleanup_basefile();
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}
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@ -1811,12 +1813,17 @@ sub cleanup {
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#
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sub no_extension {
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# Returns:
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# argument with .extension removed if any
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my $no_ext = shift;
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$no_ext =~ s:\.[^/\.]*$::; # Remove .ext from argument
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return $no_ext;
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}
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sub generate_command_line {
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# Returns:
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# the full job line to run
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# list of quoted arguments on that line
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my $command = shift;
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my ($job_line,$last_good);
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my ($next_arg,@quoted_args,@quoted_args_no_ext,$arg_length);
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@ -1902,6 +1909,13 @@ sub generate_command_line {
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sub xargs_computations {
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# Returns:
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# $number_of_substitution = number of {}'s
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# $number_of_substitution_no_ext = number of {.}'s
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# $spaces = is a single space needed at the start?
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# $length_of_command_no_args = length of command line with args removed
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# $length_of_context = context needed for each additional arg
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my $command = shift;
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if(not @Calculated::xargs_computations) {
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my ($number_of_substitution, $number_of_substitution_no_ext,
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@ -1951,6 +1965,8 @@ sub xargs_computations {
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sub shell_quote {
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# Quote the string so shell will not expand any special chars
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# Returns:
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# string quoted with \ as needed by the shell
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my (@strings) = (@_);
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my $arg;
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for $arg (@strings) {
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@ -1966,6 +1982,8 @@ sub shell_quote {
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sub shell_unquote {
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# Unquote strings from shell_quote
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# Returns:
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# string with shell quoting removed
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my (@strings) = (@_);
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my $arg;
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for $arg (@strings) {
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@ -1978,8 +1996,10 @@ sub shell_unquote {
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}
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# Replace foo{}bar or foo{.}bar
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sub context_replace {
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# Replace foo{}bar or foo{.}bar
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# Returns:
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# jobline with {} and {.} expanded to args
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my ($job_line,$quoted,$no_ext) = (@_);
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while($job_line =~/\Q$Global::replacestring\E|\Q$Global::replace_no_ext\E/o) {
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$job_line =~ /(\S*(\Q$Global::replacestring\E|\Q$Global::replace_no_ext\E)\S*)/o
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@ -2007,6 +2027,8 @@ sub context_replace {
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# Maximal command line length (for -m and -X)
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sub max_length_of_command_line {
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# Find the max_length of a command line
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# Returns:
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# number of chars on the longest command line allowed
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# First find an upper bound
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if(not $Global::command_line_max_len) {
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$Global::command_line_max_len = real_max_length();
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@ -2023,6 +2045,8 @@ sub max_length_of_command_line {
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}
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sub real_max_length {
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# Returns:
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# number of chars on the longest command line allowed
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my $len = 10;
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do {
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$len *= 10;
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@ -2031,9 +2055,10 @@ sub real_max_length {
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return binary_find_max_length(int(($len)/10),$len);
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}
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sub binary_find_max_length {
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# Given a lower and upper bound find the max_length of a command line
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# Returns:
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# number of chars on the longest command line allowed
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my ($lower, $upper) = (@_);
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if($lower == $upper or $lower == $upper-1) { return $lower; }
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my $middle = int (($upper-$lower)/2 + $lower);
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@ -2047,6 +2072,9 @@ sub binary_find_max_length {
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sub is_acceptable_command_line_length {
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# Test if a command line of this length can run
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# Returns:
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# 0 if the command line length is too long
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# 1 otherwise
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my $len = shift;
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$Global::is_acceptable_command_line_length++;
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debug("$Global::is_acceptable_command_line_length $len\n");
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@ -2061,6 +2089,8 @@ sub is_acceptable_command_line_length {
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sub compute_number_of_processes {
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# Number of processes wanted and limited by system ressources
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# Returns:
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# Number of processes
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my $opt_P = shift;
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my $sshlogin = shift;
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my $wanted_processes = user_requested_processes($opt_P,$sshlogin);
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@ -2076,6 +2106,8 @@ sub processes_available_by_system_limit {
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# Limit them to the system limits
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# Limits are: File handles, number of input lines, processes,
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# and taking > 1 second to spawn 10 extra processes
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# Returns:
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# Number of processes
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my $wanted_processes = shift;
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my $sshlogin = shift;
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@ -2171,6 +2203,9 @@ sub processes_available_by_system_limit {
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sub simultaneous_sshlogin {
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# Using $sshlogin try to see if we can do $wanted_processes
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# simultaneous logins
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# (ssh host echo simultaneouslogin & ssh host echo simultaneouslogin & ...)|grep simul|wc -l
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# Returns:
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# Number of succesful logins
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my $sshlogin = shift;
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my $wanted_processes = shift;
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my ($sshcmd,$serverlogin) = sshcommand_of_sshlogin($sshlogin);
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@ -2185,8 +2220,8 @@ sub simultaneous_sshlogin {
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sub simultaneous_sshlogin_limit {
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# Test by logging in wanted number of times simultaneously
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# (ssh e echo simultaneouslogin &ssh e echo simultaneouslogin &...)|grep simul|wc -l
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# Return min($wanted_processes,$working_simultaneous_ssh_logins-1)
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# Returns:
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# min($wanted_processes,$working_simultaneous_ssh_logins-1)
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my $sshlogin = shift;
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my $wanted_processes = shift;
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my ($sshcmd,$serverlogin) = sshcommand_of_sshlogin($sshlogin);
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@ -2212,6 +2247,10 @@ sub simultaneous_sshlogin_limit {
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sub enough_file_handles {
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# check that we have enough filehandles available for starting
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# another job
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# Returns:
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# 1 if ungrouped (thus not needing extra filehandles)
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# 0 if too few filehandles
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# 1 if enough filehandles
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if($Global::grouped) {
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my %fh;
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my $enough_filehandles = 1;
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@ -2228,7 +2267,9 @@ sub enough_file_handles {
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}
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sub user_requested_processes {
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# Parse the number of processes that the user asked for
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# Parse the number of processes that the user asked for using -j
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# Returns:
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# the number of processes to run on this sshlogin
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my $opt_P = shift;
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my $sshlogin = shift;
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my $processes;
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@ -2265,6 +2306,8 @@ sub user_requested_processes {
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sub no_of_processing_units_sshlogin {
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# Number of processing units (CPUs or cores) at this sshlogin
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# Returns:
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# number of CPUs or cores at the sshlogin
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my $sshlogin = shift;
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my ($sshcmd,$serverlogin) = sshcommand_of_sshlogin($sshlogin);
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if(not $Global::host{$sshlogin}{'ncpus'}) {
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@ -2296,6 +2339,8 @@ sub no_of_processing_units_sshlogin {
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}
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sub no_of_cpus {
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# Returns:
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# Number of physical CPUs
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if(not $Global::no_of_cpus) {
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local $/="\n"; # If delimiter is set, then $/ will be wrong
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my $no_of_cpus = (no_of_cpus_freebsd()
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@ -2314,6 +2359,8 @@ sub no_of_cpus {
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}
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sub no_of_cores {
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# Returns:
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# Number of CPU cores
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if(not $Global::no_of_cores) {
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local $/="\n"; # If delimiter is set, then $/ will be wrong
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my $no_of_cores = (no_of_cores_freebsd()
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@ -2332,6 +2379,8 @@ sub no_of_cores {
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}
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sub no_of_cpus_gnu_linux {
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# Returns:
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# Number of physical CPUs on GNU/Linux
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my $no_of_cpus;
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if(-e "/proc/cpuinfo") {
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$no_of_cpus = 0;
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@ -2348,6 +2397,8 @@ sub no_of_cpus_gnu_linux {
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}
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sub no_of_cores_gnu_linux {
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# Returns:
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# Number of CPU cores on GNU/Linux
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my $no_of_cores;
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if(-e "/proc/cpuinfo") {
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$no_of_cores = 0;
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@ -2361,26 +2412,36 @@ sub no_of_cores_gnu_linux {
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}
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sub no_of_cpus_darwin {
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# Returns:
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# Number of physical CPUs on Mac Darwin
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my $no_of_cpus = `sysctl -a hw 2>/dev/null | grep -w physicalcpu | awk '{ print \$2 }'`;
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return $no_of_cpus;
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}
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sub no_of_cores_darwin {
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# Returns:
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# Number of CPU cores on Mac Darwin
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my $no_of_cores = `sysctl -a hw 2>/dev/null | grep -w logicalcpu | awk '{ print \$2 }'`;
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return $no_of_cores;
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}
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sub no_of_cpus_freebsd {
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# Returns:
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# Number of physical CPUs on FreeBSD
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my $no_of_cpus = `sysctl hw.ncpu 2>/dev/null | awk '{ print \$2 }'`;
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return $no_of_cpus;
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}
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sub no_of_cores_freebsd {
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# Returns:
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# Number of CPU cores on FreeBSD
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my $no_of_cores = `sysctl -a hw 2>/dev/null | grep -w logicalcpu | awk '{ print \$2 }'`;
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return $no_of_cores;
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}
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sub no_of_cpus_solaris {
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# Returns:
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# Number of physical CPUs on Solaris
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if(-x "/usr/sbin/psrinfo") {
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my @psrinfo = `/usr/sbin/psrinfo`;
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if($#psrinfo >= 0) {
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@ -2397,6 +2458,8 @@ sub no_of_cpus_solaris {
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}
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sub no_of_cores_solaris {
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# Returns:
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# Number of CPU cores on Solaris
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if(-x "/usr/sbin/psrinfo") {
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my @psrinfo = `/usr/sbin/psrinfo`;
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if($#psrinfo >= 0) {
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@ -2417,6 +2480,8 @@ sub no_of_cores_solaris {
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#
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sub min {
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# Returns:
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# Minimum value of array
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my $min = shift;
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my @args = @_;
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for my $a (@args) {
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@ -2448,6 +2513,7 @@ sub min {
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sub init_run_jobs {
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# Remember the original STDOUT and STDERR
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# Returns: N/A
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open $Global::original_stdout, ">&STDOUT" or die "Can't dup STDOUT: $!";
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open $Global::original_stderr, ">&STDERR" or die "Can't dup STDERR: $!";
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open $Global::original_stdin, "<&STDIN" or die "Can't dup STDIN: $!";
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@ -2464,12 +2530,16 @@ sub init_run_jobs {
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}
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sub login_and_host {
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# Returns:
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# login@hostname
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my $sshlogin = shift;
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$sshlogin =~ /(\S+$)/ or die;
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return $1;
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}
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sub next_command_line_with_sshlogin {
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# Returns:
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# next command to run with ssh command wrapping if remote
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my $sshlogin = shift;
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my ($next_command_line, $args_ref) = next_command_line();
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my ($sshcmd,$serverlogin) = sshcommand_of_sshlogin($sshlogin);
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@ -2501,6 +2571,9 @@ sub next_command_line_with_sshlogin {
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}
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sub next_command_line {
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# Returns:
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# next command line
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# list of arguments for the line
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my ($cmd_line,$args_ref);
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if(@Global::unget_next_command_line) {
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$cmd_line = shift @Global::unget_next_command_line;
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@ -2514,10 +2587,13 @@ sub next_command_line {
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}
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sub unget_command_line {
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# Returns: N/A
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push @Global::unget_next_command_line, @_;
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}
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sub get_next_arg {
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# Returns:
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# next argument from input
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my $arg;
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if(@Global::unget_arg) {
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$arg = shift @Global::unget_arg;
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@ -2554,10 +2630,12 @@ sub get_next_arg {
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}
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sub unget_arg {
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# Returns: N/A
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push @Global::unget_arg, @_;
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}
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sub drain_job_queue {
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# Returns: N/A
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if($::opt_progress) {
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DoNotReap();
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print init_progress();
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@ -2586,6 +2664,7 @@ sub drain_job_queue {
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sub toggle_progress {
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# Turn on/off progress view
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# Returns: N/A
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$::opt_progress = not $::opt_progress;
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if($::opt_progress) {
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print init_progress();
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@ -2593,6 +2672,8 @@ sub toggle_progress {
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}
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sub init_progress {
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# Returns:
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# list of computers for progress output
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$|=1;
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my %progress = progress();
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return ("\nComputers / CPU cores / Max jobs to run\n",
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@ -2600,6 +2681,10 @@ sub init_progress {
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}
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sub progress {
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# Returns:
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# list of workers
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# header that will fit on the screen
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# status message that will fit on the screen
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my $termcols = columns();
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my ($status, $header)=("x"x($termcols+1),"");
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my @workers = sort keys %Global::host;
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@ -2737,6 +2822,8 @@ sub progress {
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sub columns {
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# Get the number of columns of the display
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# Returns:
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# number of columns of the screen
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if(not $Global::columns) {
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$Global::columns = $ENV{'COLUMNS'};
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if(not $Global::columns) {
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@ -2749,6 +2836,8 @@ sub columns {
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}
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sub start_more_jobs {
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# Returns:
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# number of jobs started
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my $jobs_started = 0;
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if(not $Global::StartNoNewJobs) {
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for my $sshlogin (keys %Global::host) {
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@ -2769,12 +2858,13 @@ sub start_more_jobs {
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}
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sub start_another_job {
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# Grab a job from @Global::command, start it
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# Grab a job from @Global::command, start it at sshlogin
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# and remember the pid, the STDOUT and the STDERR handles
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# Return 1.
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# If no more jobs: do nothing and return 0
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# Do we have enough file handles to start another job?
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# Returns:
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# 1 if another jobs was started
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# 0 otherwise
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my $sshlogin = shift;
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# Do we have enough file handles to start another job?
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if(enough_file_handles()) {
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my $command = next_command_line_with_sshlogin($sshlogin);
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if(defined $command) {
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@ -2799,6 +2889,13 @@ sub start_another_job {
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sub start_job {
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# Setup STDOUT and STDERR for a job and start it.
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# Returns:
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# "seq" => sequence number of job
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# "pid" => process id
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# "out" => STDOUT filehandle (if grouped)
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# "err" => STDERR filehandle (if grouped)
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# "sshlogin" => sshlogin
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# "command" => command being run
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my $command = shift;
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my $sshlogin = shift;
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my ($pid,$out,$err,%out,%err,$outname,$errname,$name);
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|
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@ -2878,6 +2975,7 @@ sub start_job {
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sub print_job {
|
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# Print the output of the jobs
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# Returns: N/A
|
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# Only relevant for grouping
|
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$Global::grouped or return;
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my $fhs = shift;
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@ -2919,6 +3017,7 @@ sub print_job {
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#
|
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|
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sub read_sshloginfile {
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# Returns: N/A
|
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my $file = shift;
|
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open(IN, $file) || die "Cannot open $file";
|
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while(<IN>) {
|
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|
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@ -2929,6 +3028,7 @@ sub read_sshloginfile {
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}
|
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sub parse_sshlogin {
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||||
# Returns: N/A
|
||||
my (@login);
|
||||
if(not @Global::sshlogin) { @Global::sshlogin = (":"); }
|
||||
for my $sshlogin (@Global::sshlogin) {
|
||||
|
|
@ -2966,6 +3066,8 @@ sub parse_sshlogin {
|
|||
|
||||
sub remote_hosts {
|
||||
# Return sshlogins that are not ':'
|
||||
# Returns:
|
||||
# list of sshlogins with ':' removed
|
||||
return grep !/^:$/, keys %Global::host;
|
||||
}
|
||||
|
||||
|
|
@ -2975,6 +3077,9 @@ sub sshcommand_of_sshlogin {
|
|||
# 'myssh user@server' -> ('myssh','user@server')
|
||||
# 'myssh -l user server' -> ('myssh -l user','server')
|
||||
# '/usr/local/bin/myssh -l user server' -> ('/usr/local/bin/myssh -l user','server')
|
||||
# Returns:
|
||||
# sshcommand - defaults to 'ssh'
|
||||
# login@host
|
||||
my $sshlogin = shift;
|
||||
my ($sshcmd, $serverlogin);
|
||||
if($sshlogin =~ /(.+) (\S+)$/) {
|
||||
|
|
@ -3007,6 +3112,8 @@ sub sshcommand_of_sshlogin {
|
|||
}
|
||||
|
||||
sub control_path_dir {
|
||||
# Returns:
|
||||
# path to directory
|
||||
if(not $Global::control_path_dir) {
|
||||
$Global::control_path_dir = tempdir("/tmp/parallel-ssh-XXXX", CLEANUP => 1 );
|
||||
}
|
||||
|
|
@ -3015,23 +3122,31 @@ sub control_path_dir {
|
|||
|
||||
sub sshtransfer {
|
||||
# Return the sshcommand needed to transfer the file
|
||||
# Returns:
|
||||
# ssh command needed to transfer file to sshlogin
|
||||
return sshtransferreturn(@_,1,0);
|
||||
}
|
||||
|
||||
sub sshreturn {
|
||||
# Return the sshcommand needed to returning the file
|
||||
# Returns:
|
||||
# ssh command needed to transfer file from sshlogin
|
||||
my $removesource = $::opt_cleanup;
|
||||
return sshtransferreturn(@_,0,$removesource);
|
||||
}
|
||||
|
||||
sub sshcleanup {
|
||||
# Return the sshcommand needed to remove the file
|
||||
# Returns:
|
||||
# ssh command needed to remove file from sshlogin
|
||||
my ($sshlogin,$file) = (@_);
|
||||
my ($sshcmd,$serverlogin) = sshcommand_of_sshlogin($sshlogin);
|
||||
return "$sshcmd $serverlogin rm -f ".shell_quote($file);
|
||||
}
|
||||
|
||||
sub sshtransferreturn {
|
||||
# Returns:
|
||||
# ssh comands needed to transfer file to/from sshlogin
|
||||
my ($sshlogin,$file,$transfer,$removesource) = (@_);
|
||||
my ($sshcmd,$serverlogin) = sshcommand_of_sshlogin($sshlogin);
|
||||
my $rsync_opt = "-rlDzRE -e".shell_quote($sshcmd);
|
||||
|
|
@ -3073,7 +3188,7 @@ sub sshtransferreturn {
|
|||
sub setup_basefile {
|
||||
# Transfer basefiles to each $sshlogin
|
||||
# This needs to be done before first jobs on $sshlogin is run
|
||||
# Can we do this in parallel?
|
||||
# Returns: N/A
|
||||
my $cmd = "";
|
||||
for my $sshlogin (keys %Global::host) {
|
||||
if($sshlogin eq ":") { next }
|
||||
|
|
@ -3096,6 +3211,7 @@ sub setup_basefile {
|
|||
|
||||
sub cleanup_basefile {
|
||||
# Remove the basefiles transferred
|
||||
# Returns: N/A
|
||||
my $cmd="";
|
||||
for my $sshlogin (keys %Global::host) {
|
||||
if($sshlogin eq ":") { next }
|
||||
|
|
@ -3114,12 +3230,14 @@ sub cleanup_basefile {
|
|||
#
|
||||
|
||||
sub ListRunningJobs {
|
||||
# Returns: N/A
|
||||
for my $v (values %Global::running) {
|
||||
print STDERR "$Global::progname: ",$v->{'command'},"\n";
|
||||
}
|
||||
}
|
||||
|
||||
sub StartNoNewJobs {
|
||||
# Returns: N/A
|
||||
print STDERR
|
||||
("$Global::progname: SIGTERM received. No new jobs will be started.\n",
|
||||
"$Global::progname: Waiting for these ", scalar(keys %Global::running),
|
||||
|
|
@ -3130,18 +3248,21 @@ sub StartNoNewJobs {
|
|||
}
|
||||
|
||||
sub CountSigChild {
|
||||
# Returns: N/A
|
||||
$Global::SigChildCaught++;
|
||||
}
|
||||
|
||||
sub DoNotReap {
|
||||
# This will postpone SIGCHILD for sections that cannot be distracted by a dying child
|
||||
# (Racecondition)
|
||||
# Returns: N/A
|
||||
$SIG{CHLD} = \&CountSigChild;
|
||||
}
|
||||
|
||||
sub ReapIfNeeded {
|
||||
# Do the postponed SIGCHILDs if any and re-install normal reaper for SIGCHILD
|
||||
# (Racecondition)
|
||||
# Returns: N/A
|
||||
if($Global::SigChildCaught) {
|
||||
$Global::SigChildCaught = 0;
|
||||
Reaper();
|
||||
|
|
@ -3153,6 +3274,7 @@ sub Reaper {
|
|||
# A job finished.
|
||||
# Print the output.
|
||||
# Start another job
|
||||
# Returns: N/A
|
||||
DoNotReap();
|
||||
$Global::reaperlevel++;
|
||||
my $stiff;
|
||||
|
|
@ -3219,11 +3341,13 @@ sub Reaper {
|
|||
#
|
||||
|
||||
sub die_usage {
|
||||
# Returns: N/A
|
||||
usage();
|
||||
exit(255);
|
||||
}
|
||||
|
||||
sub usage {
|
||||
# Returns: N/A
|
||||
print "Usage:\n";
|
||||
print "$Global::progname [options] [command [arguments]] < list_of_arguments\n";
|
||||
print "\n";
|
||||
|
|
@ -3231,6 +3355,7 @@ sub usage {
|
|||
}
|
||||
|
||||
sub version {
|
||||
# Returns: N/A
|
||||
print join("\n",
|
||||
"$Global::progname $Global::version",
|
||||
"Copyright (C) 2007,2008,2009,2010 Ole Tange and Free Software Foundation, Inc.",
|
||||
|
|
@ -3243,6 +3368,7 @@ sub version {
|
|||
}
|
||||
|
||||
sub show_limits {
|
||||
# Returns: N/A
|
||||
print("Maximal size of command: ",real_max_length(),"\n",
|
||||
"Maximal used size of command: ",max_length_of_command_line(),"\n",
|
||||
"\n",
|
||||
|
|
@ -3257,6 +3383,7 @@ sub show_limits {
|
|||
#
|
||||
|
||||
sub debug {
|
||||
# Returns: N/A
|
||||
$Global::debug or return;
|
||||
if($Global::original_stdout) {
|
||||
print $Global::original_stdout @_;
|
||||
|
|
@ -3266,6 +3393,9 @@ sub debug {
|
|||
}
|
||||
|
||||
sub my_memory_usage {
|
||||
# Returns:
|
||||
# memory usage if found
|
||||
# 0 otherwise
|
||||
use strict;
|
||||
use FileHandle;
|
||||
|
||||
|
|
@ -3287,6 +3417,9 @@ sub my_memory_usage {
|
|||
}
|
||||
|
||||
sub my_size {
|
||||
# Returns:
|
||||
# size of object if Devel::Size is installed
|
||||
# -1 otherwise
|
||||
my @size_this = (@_);
|
||||
eval "use Devel::Size qw(size total_size)";
|
||||
if ($@) {
|
||||
|
|
@ -3298,6 +3431,9 @@ sub my_size {
|
|||
|
||||
|
||||
sub my_dump {
|
||||
# Returns:
|
||||
# ascii expression of object if Data::Dump(er) is installed
|
||||
# error code otherwise
|
||||
my @dump_this = (@_);
|
||||
eval "use Data::Dump qw(dump);";
|
||||
if ($@) {
|
||||
|
|
|
|||
Loading…
Reference in a new issue