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https://issues.apache.org/jira/browse/MAPREDUCE-4469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas updated MAPREDUCE-4469:
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Status: Open (was: Patch Available)
branch-1 is not getting new fixes, but it looks like {{ProcfsBasedProcessTree}}
in trunk could benefit from this same set of optimizations. I'll leave the
issue open, in case someone has the time and inclination to rebase it.
> Resource calculation in child tasks is CPU-heavy
> ------------------------------------------------
>
> Key: MAPREDUCE-4469
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4469
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: performance, task
> Affects Versions: 1.0.3
> Reporter: Todd Lipcon
> Assignee: Ahmed Radwan
> Labels: BB2015-05-TBR
> Attachments: MAPREDUCE-4469.patch, MAPREDUCE-4469_rev2.patch,
> MAPREDUCE-4469_rev3.patch, MAPREDUCE-4469_rev4.patch,
> MAPREDUCE-4469_rev5.patch
>
>
> In doing some benchmarking on a hadoop-1 derived codebase, I noticed that
> each of the child tasks was doing a ton of syscalls. Upon stracing, I noticed
> that it's spending a lot of time looping through all the files in /proc to
> calculate resource usage.
> As a test, I added a flag to disable use of the ResourceCalculatorPlugin
> within the tasks. On a CPU-bound 500G-sort workload, this improved total job
> runtime by about 10% (map slot-seconds by 14%, reduce slot seconds by 8%)
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