Todd Lipcon created MAPREDUCE-4469:
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Summary: 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
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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