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Work around for race condition. Comparison table.
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Ole Tange
parent
47cf0f0128
commit
adff24a1a0
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@ -1,6 +1,8 @@
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# Examples of sem
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Weird bug - only interactive
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perlipc: Complete Dissociation of Child from Parent
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Setting $SIG{CHLD} to 'IGNORE'
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echo '### BUG: Test --fg followed by --bg'
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parallel -u --fg --semaphore seq 1 10 '|' pv -qL 20
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@ -81,7 +81,7 @@ to:parallel@gnu.org, bug-parallel@gnu.org, info-gnu@gnu.org, bug-directory@gnu.o
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cc:Peter Simons <simons@cryp.to>, Sandro Cazzaniga <kharec@mandriva.org>,
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Tim Cuthbertson <tim3d.junk@gmail.com>, Ludovic Courtès <ludo@gnu.org>,
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Markus Ammer <mkmm@gmx-topmail.de>, Pavel Nuzhdin <pnzhdin@gmail.com>,
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((psung@alum.mit.edu))
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Phil Sung <psung@alum.mit.edu>
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Subject: GNU Parallel 20100722 released
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@ -112,7 +112,7 @@ New in this release:
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Thanks to Pavel Nuzhdin <pnzhdin at gmail dot com>
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* Web review http://psung.blogspot.com/2010/08/gnu-parallel.html
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Thanks to Phil Sung ((<psung at alum dot mit dot edu>))
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Thanks to Phil Sung <psung at alum dot mit dot edu>
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= About GNU Parallel =
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92
src/parallel
92
src/parallel
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@ -1451,6 +1451,93 @@ There are a lot programs with some of the functionality of GNU
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B<parallel>. GNU B<parallel> strives to include the best of the
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functionality without sacrifying ease of use.
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=head2 SUMMARY TABLE
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The following features are in some of the comparable tools:
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Execution
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E1. Running jobs in parallel
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E2. List running jobs
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E3. Finish running jobs, but do not start new jobs
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E4. Number of running jobs can depend on number of cpus
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E5. Finish running jobs, but do not start new jobs after first failure
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Outputs
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O1. Grouping output so output from different jobs do not mix
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O2. Send stderr to stderr
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O3. Send stdout to stdout
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O4. Order of output can be same as order of input
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O5. Stdout only from the command
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O6. Stderr only from the command
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Inputs
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I1. Arguments can be read from stdin
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I2. Arguments can be read from a file
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I3. Arguments can be read from multiple files
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I4. Arguments can be read from command line
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I5. Arguments can be read from a table
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I6. Line oriented input as default (Quoting of special chars not needed)
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Manipulation of input
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M1. Composed command
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M2. Multiple arguments can fill up an execution line
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M3. Arguments can be put anywhere in the execution line
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M4. Multiple arguments can be put anywhere in the execution line
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M5. Arguments can be replaced with context
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M6. Input can be treated as complete execution line
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Remote execution
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R1. Jobs can be run on remote computers
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R2. Basefiles can be transferred
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R3. Argument files can be transferred
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R4. Result files can be transferred
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R5. Cleanup of transferred files
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R6. No config files needed
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R7. Do not run more than SSHD's MaxStartup can handle
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R8. Configurable SSH command
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Semaphore
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S1. Possibility to work as a mutex
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S2. Possibility to work as a counting semaphore
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Legend
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- = no
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x = not applicable
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ID = yes
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As every new version of the programs are not tested the table may be
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outdated. Please file a bug-report if you find errors.
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parallel: E1 E2 E3 E4 E5 O1 O2 O3 O4 O5 O6 I1 I2 I3 I4 I5 I6 M1 M2 M3
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M4 M5 M6 R1 R2 R3 R4 R5 R6 R7 R8 S1 S2
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xargs: E1 - - - - - O2 O3 - O5 O6 I1 I2 - - - - - M2 M3 -
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- - - - - - - x - - -
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find -exec: - - - x - x O2 O3 O4 O5 O6 - - - - - - - M2 M3 -
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- - - - - - - - - x x
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make -j: E1 - - - E5 O1 O2 O3 - x O6 - - - - - - - - - - - - - - - - -
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- - -
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ppss: E1 E2 ?E3 E4 - O1 - - x - - I1 I2 - - - I6 M1 - M3 - - M6 R1 R2
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R3 R4 - - ?R7 - -
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pexec: E1 - - E4 - O1 O2 O3 - O5 O6 I1 I2 - I4 I5 - M1 - M3 - - M6 R1
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- - - - R6 - S1 -
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xjobs: TODO
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prll: TODO
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dxargs: TODO
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mdm/middelman: TODO
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xapply: TODO
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ClusterSSH: TODO
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=head2 DIFFERENCES BETWEEN xargs AND GNU Parallel
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@ -2031,6 +2118,10 @@ sub acquire_semaphore {
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# therefore release and re-acquire the semaphore
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$sem->release();
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if(fork()) {
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# TODO figure out the race condition that requires this sleep 1
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# sem --fg seq 21 30
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# sem --bg seq 31 40
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sleep(1);
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exit(0);
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} else {
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# child
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@ -3553,7 +3644,6 @@ sub start_job {
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debug("$Global::total_running processes. Starting: $command\n");
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#print STDERR "LEN".length($command)."\n";
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$Private::job_start_sequence++;
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if(@::opt_a and $Private::job_start_sequence == 1) {
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# Give STDIN to the first job if using -a
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$pid = open3("<&STDIN", ">&STDOUT", ">&STDERR", $command) ||
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