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More intelligent determining the max line length.

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This commit is contained in:
Ole Tange 2010-07-09 14:53:56 +02:00
parent ccd17d35c5
commit 3b8e04b91b
2 changed files with 131 additions and 43 deletions
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20
doc/FUTURE_IDEAS
View file

@ -1,3 +1,5 @@
Unittest: -0 on filenames ending in \n
# Hvordan udregnes system limits på remote systems hvis jeg ikke ved, hvormange
# argumenter, der er? Lav system limits lokalt og lad det være max
@ -14,6 +16,24 @@
# Clustering Tools | Command Line Tools | Utilities | System Administration
# Bash parallel
=head1 YouTube video2
Converting of WAV files to MP3 using GNU Parallel
# Run one jobs per CPU core
# For 'foo.wav' call the output file 'foo.mp3'
find music-files -type f | parallel -j+0 lame {} -o {.}.mp3
# Run one jobs per CPU core
# Run on local computer + 2 remote computers
# Give us progress information
# For 'foo.wav' call the output file 'foo.mp3'
find music-files -type f | parallel -j+0 -S :,computer1.examle.com,computer2.example.com \
--eta --trc {.}.mp3 lame {} -o {.}.mp3
=head1 YouTube video
GNU Parallel is a tool with lots of uses in shell. Every time you use

154
src/parallel
View file

@ -1677,7 +1677,7 @@ if($::opt_halt_on_error) {
sub parse_options {
# Returns: N/A
# Defaults:
$Global::version = 20100705;
$Global::version = 20100706;
$Global::progname = 'parallel';
$Global::debug = 0;
$Global::verbose = 0;
@ -1846,7 +1846,7 @@ sub parse_options {
# must be done after opt_a
$::opt_progress = $::opt_eta;
my @args = ();
while(not eof $Global::argfile) {
while(more_arguments()) {
# This will read all arguments and compute $Global::total_jobs
push @args, get_next_arg();
}
@ -1908,6 +1908,46 @@ sub generate_command_line {
# list of quoted arguments on that line
my $command = shift;
my ($job_line,$last_good);
my ($quoted_args,$quoted_args_no_ext) =
get_multiple_args($command,max_length_of_command_line(),0);
if(@$quoted_args) {
$job_line = $command;
if(defined $job_line and
($job_line =~/\Q$Global::replacestring\E/o or
$job_line =~/\Q$Global::replace_no_ext\E/o)) {
# substitute {} and {.} with args
if($Global::Xargs) {
# Context sensitive replace (foo{}bar with fooargsbar)
$job_line =
context_replace($job_line, $quoted_args, $quoted_args_no_ext);
} else {
# Normal replace {} with args and {.} with args without extension
my $arg=join(" ",@$quoted_args);
my $arg_no_ext=join(" ",@$quoted_args_no_ext);
$job_line =~ s/\Q$Global::replacestring\E/$arg/go;
$job_line =~ s/\Q$Global::replace_no_ext\E/$arg_no_ext/go;
}
} else {
# append args
my $arg=join(" ",@$quoted_args);
if($job_line) {
$job_line .= " ".$arg;
} else {
# Parallel behaving like '|sh'
$job_line = $arg;
}
}
debug("Return jobline(".length($job_line)."): !$job_line!\n");
}
return ($job_line,$quoted_args);
}
sub get_multiple_args {
# Returns:
# \@quoted_args - empty if no more args
# \@quoted_args_no_ext
my ($command,$max_length_of_command_line,$test_only_mode) = (@_);
my ($next_arg,@quoted_args,@quoted_args_no_ext,$arg_length);
my ($number_of_substitution,
$number_of_substitution_no_ext,$spaces,
@ -1927,13 +1967,17 @@ sub generate_command_line {
+ $length_of_context;
$arg_length += $next_arg_len;
my $job_line_length = $length_of_command_no_args + $arg_length;
if($job_line_length >= max_length_of_command_line()) {
if($job_line_length >= $max_length_of_command_line) {
unget_arg(pop @quoted_args);
pop @quoted_args_no_ext;
if($test_only_mode) {
last;
}
if($::opt_x and $length_of_command_no_args + $next_arg_len
>= max_length_of_command_line()) {
>= $max_length_of_command_line) {
# To be compatible with xargs -x
print STDERR ("Command line too long ($job_line_length >= "
. max_length_of_command_line() .
. $max_length_of_command_line .
") at number $number_of_args: ".
(substr($next_arg,0,50))."...\n");
exit(255);
@ -1942,7 +1986,7 @@ sub generate_command_line {
last;
} else {
print STDERR ("Command line too long ($job_line_length >= "
. max_length_of_command_line() .
. $max_length_of_command_line .
") at number $number_of_args: ".
(substr($next_arg,0,50))."...\n");
exit(255);
@ -1957,36 +2001,7 @@ sub generate_command_line {
last;
}
}
if(@quoted_args) {
$job_line = $command;
if(defined $job_line and
($job_line =~/\Q$Global::replacestring\E/o or
$job_line =~/\Q$Global::replace_no_ext\E/o)) {
# substitute {} and {.} with args
if($Global::Xargs) {
# Context sensitive replace (foo{}bar with fooargsbar)
$job_line =
context_replace($job_line, \@quoted_args, \@quoted_args_no_ext);
} else {
# Normal replace {} with args and {.} with args without extension
my $arg=join(" ",@quoted_args);
my $arg_no_ext=join(" ",@quoted_args_no_ext);
$job_line =~ s/\Q$Global::replacestring\E/$arg/go;
$job_line =~ s/\Q$Global::replace_no_ext\E/$arg_no_ext/go;
}
} else {
# append args
my $arg=join(" ",@quoted_args);
if($job_line) {
$job_line .= " ".$arg;
} else {
# Parallel behaving like '|sh'
$job_line = $arg;
}
}
debug("Return jobline(".length($job_line)."): !$job_line!\n");
}
return ($job_line,\@quoted_args);
return (\@quoted_args,\@quoted_args_no_ext);
}
@ -2113,7 +2128,7 @@ sub max_length_of_command_line {
# number of chars on the longest command line allowed
# First find an upper bound
if(not $Global::command_line_max_len) {
$Global::command_line_max_len = real_max_length();
$Global::command_line_max_len = limited_max_length();
if($::opt_s) {
if($::opt_s <= $Global::command_line_max_len) {
$Global::command_line_max_len = $::opt_s;
@ -2126,15 +2141,60 @@ sub max_length_of_command_line {
return $Global::command_line_max_len;
}
sub real_max_length {
sub limited_max_length {
# Returns:
# number of chars on the longest command line allowed
my $len = 10;
# min(opt_s, number of chars on the longest command line allowed)
if($::opt_s) {
if(is_acceptable_command_line_length($::opt_s)) {
debug("-s is OK: $::opt_s\n");
return $::opt_s;
}
# -s is too long: Find the correct
return binary_find_max_length(0,$::opt_s);
}
#TODO
# Running is_acceptable_command_line_length is expensive
# Try to run as few times as possible.
# If all arguments fit on the line now, don't try a longer length
my ($quoted_args,$quoted_args_no_ext);
my $more = more_arguments();
my $len = 8;
my $is_acceptable;
do {
$len *= 10;
$len *= 16;
$is_acceptable = is_acceptable_command_line_length($len);
($quoted_args,$quoted_args_no_ext) =
get_multiple_args($Global::command,$len,1);
$more = more_arguments();
debug("Test len: $len\n");
# Reset the getting of args
my $next = get_next_arg();
if($next) {
push @$quoted_args, $next;
}
if (@$quoted_args) {
unget_arg(@$quoted_args);
}
} while ($more and $is_acceptable);
if(not $is_acceptable) {
# There are more arguments than will fit on one line
# Then search for the actual max length between 0 and upper bound
return binary_find_max_length(int(($len)/16),$len);
} else {
# The arguments will fit on one line of length $len
return $len;
}
}
sub real_max_length {
my $len = 8;
do {
$len *= 16;
} while (is_acceptable_command_line_length($len));
# Then search for the actual max length between 0 and upper bound
return binary_find_max_length(int(($len)/10),$len);
return binary_find_max_length(int(($len)/16),$len);
}
sub binary_find_max_length {
@ -2164,6 +2224,7 @@ sub is_acceptable_command_line_length {
open (STDERR,">/dev/null");
system "true "."x"x$len;
close STDERR;
debug("$len $?\n");
return not $?;
}
@ -2673,14 +2734,21 @@ sub unget_command_line {
push @Global::unget_next_command_line, @_;
}
sub more_arguments {
# Returns:
# whether there are more arguments to be processed or not
return (@Global::unget_arg or not eof $Global::argfile);
}
sub get_next_arg {
# Returns:
# next argument from input
# undef if end of file
my $arg;
if(@Global::unget_arg) {
$arg = shift @Global::unget_arg;
} else {
if(eof $Global::argfile) {
if(not more_arguments()) {
return undef;
}
$arg = <$Global::argfile>;