GitHub user aarondav opened a pull request:
https://github.com/apache/spark/pull/3469
[SPARK-4516] Cap default number of Netty threads at 8
In practice, only 2-4 cores should be required to transfer roughly 10 Gb/s,
and each core that we use will have an initial overhead of roughly 32 MB of
off-heap memory, which comes at a premium.
Thus, this value should still retain maximum throughput and reduce wasted
off-heap memory allocation. It can be overridden by setting the number of
serverThreads and clientThreads manually in Spark's configuration.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/aarondav/spark fewer-pools2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3469.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3469
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commit 087c59f9dab65de8471c427a14d9ec6b32ad1811
Author: Aaron Davidson <[email protected]>
Date: 2014-11-26T04:39:09Z
[SPARK-4516] Cap default number of Netty threads at 8
In practice, only 2-4 cores should be required to transfer roughly 10 Gb/s,
and each core that we use will have an initial overhead of roughly 32 MB of
off-heap memory, which comes at a premium.
Thus, this value should still retain maximum throughput and reduce wasted
off-heap memory allocation. It can be overridden by setting the number of
serverThreads and clientThreads manually in Spark's configuration.
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