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GNU Parallel.md - #313

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GNU Parallel.md#313
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@Graviton28 Graviton28 commented Aug 4, 2026

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the "imagemagick module unavailable" callout was stale (self-dated ~june 23, said a fix was coming "within a day"). module load imagemagick works fine now, so removed it.

found imagemagick example was broken, imagemagick's convert only understands image formats, so convert {}.csv {}.txt errors out every time (no decode delegate for this image format 'CSV'). replaced it with a real png to jpg conversion and tested it end to end.

…d broken example

Ran every example in this doc live on Easley. The "imagemagick module
unavailable" callout was stale (dated ~June 23, promised a fix "within
a day") - module load imagemagick works fine now, so removed the
callout. Also found the file-conversion example itself was broken
independent of that: ImageMagick's convert can't turn .csv into .txt,
it only understands image formats. Replaced it with a real png->jpg
conversion example and tested it.

Also verified: gzip/gunzip compression, single-node MATLAB+parallel
(4 CSVs produced), the --sshloginfile passwordless-SSH-between-nodes
setup, and both the 2-node matlab_parallel.slurm and
python_parallel.slurm batch scripts - confirmed via GNU Parallel's
joblog (task start times and hostnames) that these genuinely run
distributed across both allocated nodes rather than silently falling
back to one node.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Graviton28 requested a review from gmfricke as a code owner August 4, 2026 02:30
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Graviton28 marked this pull request as draft August 4, 2026 02:33
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Graviton28 marked this pull request as ready for review August 4, 2026 04:53
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