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- The directory /nfs/farm/g/glast/u26/MC-tasks/obssim-ST-v7r6p1/output contains approximately 1500 runs
Experiment 1
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[~tonyj:glastlnx07] /nfs/farm/g/glast/u26/MC-tasks/obssim-ST-v7r6p1/output > /usr/bin/time grep cob0343 */logFile.txt
0.16user 0.13system 0:00.73elapsed 39%CPU
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Note This does not scale to large number of directories, since */logFile.txt is expanded by the shell and eventually the expanded line becomes too long.
Experiment 2
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[~tonyj:glastlnx07] /nfs/farm/g/glast/u26/MC-tasks/obssim-ST-v7r6p1/output > /usr/bin/time find */logFile.txt -exec grep cob0343 \{\} \;
0.44user 1.95system 0:03.41elapsed 69%CPU
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Note This command scales much better. Note that grep is invoked 1500 times in this case, but that does not seem to introduce a huge overhead.
Experiment 3
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[~tonyj:glastlnx07] /nfs/farm/g/glast/u26/MC-tasks/obssim-ST-v7r6p1/output > ls -1 */logFile.txt > /tmp/file.list
cat /tmp/file.list | /usr/bin/time xargs -i grep cob0343 \{\}
0.50user 1.80system 0:03.58elapsed 64%CPU
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