GitHub user iksaif opened a pull request:
https://github.com/apache/cassandra/pull/151
[CASSANDRA-13651]: Reduce epoll/timerfd CPU usage
- Bump Netty to 4.1.15
- Add a setting to schedule flushes immediatly
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/iksaif/cassandra cassandra-13651-trunk
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/cassandra/pull/151.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 #151
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commit 969dcee971242ff08a2ba1baf9e3139935e85ee8
Author: Corentin Chary <[email protected]>
Date: 2017-09-18T12:12:46Z
Bump netty to 4.1.15
This is to take advantages of the improvements from
https://github.com/netty/netty/pull/7042
commit 594ef9eee5ad853eaec4234f9a11bc12e030ae6c
Author: Corentin Chary <[email protected]>
Date: 2017-09-18T12:26:35Z
CASSANDRA-13651: Reduce CPU used by epoll_wait() / timerfd_create()
By setting -Dcassandra.native_transport_flush_delay_nanoseconds=0 one can
schedule the flush() immediatly which will be more efficient when
using epoll() on Linux by reducing the number of calls to epoll_wait().
This is simmilarly more efficient on version of netty that use timerfd
to get timeouts with microsecond resolution when calling epoll().
On those platforms this can save up to 10% of CPU.
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