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On 2 May 2013, at 17:27, Alan Mackenzie wrote: |
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> ... |
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> Watching the build, it became evident that the first 50 minutes or so |
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> was taken up by several hundred mkdir operations (more precisely, mkdir |
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> -p <long path>). Some of these mkdir's would take, perhaps, a minute to |
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> execute. All the while, top showed make taking 100% of one core. |
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I think that at least you need to write a short shell script in which $i, $j, $k & $l each number 0 - 9, and which you create 1000 or 100,000 directories in the format /1/2/3/4/5 (or /a/b/c/d/e/). |
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I'm not sure if it's equally good to record the number of seconds since the epoc into a variable as the script launches as it i to just run the `time` command. |
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The former would allow you to calculate how long it's taken to create a directory (or 100 of them). You can compare how long it takes to delete directories and how long it takes to create and delete empty files (or files containing a single character). |
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I think you need to run this script on all your filesystems, and compare the results when emerge is and isn't running. |
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Ideally you'd hope to be able to reproduce this slow directory creation behaviour using only your shell script. |
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I think it's really easy to create such a shell script as this and to compare the results. I appreciate that adding complexities to it might be a chore, but it might be that you can reproduce the behaviour simply by creating 1000 directories with a single bash loop. I think it's pretty important to rule that out before assuming that the problem is with portage. |
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Stroller. |
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