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https://issues.apache.org/jira/browse/STORM-297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14017360#comment-14017360
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ASF GitHub Bot commented on STORM-297:
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Github user Gvain commented on the pull request:
https://github.com/apache/incubator-storm/pull/103#issuecomment-45050542
@clockfly , Just let you know that I keep the
topology.executor.send.buffer.size and the
topology.executor.receive.buffer.size unchanged which are both 1024. And the
netty.server/client.worker_threads are both set to 1, and
storm.messaging.netty.buffer_size is set to 5242880
I think this discuss will help us understand the issue much better.
> Storm Performance cannot be scaled up by adding more CPU cores
> --------------------------------------------------------------
>
> Key: STORM-297
> URL: https://issues.apache.org/jira/browse/STORM-297
> Project: Apache Storm (Incubating)
> Issue Type: Bug
> Reporter: Sean Zhong
> Labels: Performance, netty
> Fix For: 0.9.2-incubating
>
> Attachments: Storm_performance_fix.pdf,
> storm_Netty_receiver_diagram.png, storm_performance_fix.patch,
> worker_throughput_without_storm-297.png
>
>
> We cannot scale up the performance by adding more CPU cores and increasing
> parallelism.
> For a 2 layer topology Spout ---shuffle grouping--> bolt, when message size
> is small (around 100 bytes), we can find in the below picture that neither
> the CPU nor the network is saturated. When message size is 100 bytes, only
> 40% of CPU is used, only 18% of network is used, although we have a high
> parallelism (overall we have 144 executors)
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