program/GF-DUMP: Shield ping processing from traffic to Glusterfs
Program
Since poller thread bears the brunt of execution till the request is handed over to io-threads, poller thread experiencies lock contention(s) in the control flow till io-threads, which slows it down. This delay invariably affects reading ping requests from network and responding to them, resulting in increased ping latencies, which sometimes results in a ping-timer-expiry on client leading to disconnect of transport. So, this patch aims to free up poller thread from executing code of Glusterfs Program.
We do this by making
* Glusterfs Program registering itself asking rpcsvc to execute its actors in its own threads.
* GF-DUMP Program registering itself asking rpcsvc to _NOT_ execute its actors in its own threads. Otherwise program's ownthreads become bottleneck in processing ping traffic. This means that poller thread reads a ping packet, invokes its actor and hands the response msg to transport queue.
Change-Id: I526268c10bdd5ef93f322a4f95385137550a6a49
Signed-off-by: Raghavendra G <rgowdapp@xxxxxxxxxx>
BUG: 1421938
Patch: https://review.gluster.org/#/c/17105/
Since poller thread bears the brunt of execution till the request is handed over to io-threads, poller thread experiencies lock contention(s) in the control flow till io-threads, which slows it down. This delay invariably affects reading ping requests from network and responding to them, resulting in increased ping latencies, which sometimes results in a ping-timer-expiry on client leading to disconnect of transport. So, this patch aims to free up poller thread from executing code of Glusterfs Program.
We do this by making
* Glusterfs Program registering itself asking rpcsvc to execute its actors in its own threads.
* GF-DUMP Program registering itself asking rpcsvc to _NOT_ execute its actors in its own threads. Otherwise program's ownthreads become bottleneck in processing ping traffic. This means that poller thread reads a ping packet, invokes its actor and hands the response msg to transport queue.
Change-Id: I526268c10bdd5ef93f322a4f95385137550a6a49
Signed-off-by: Raghavendra G <rgowdapp@xxxxxxxxxx>
BUG: 1421938
Patch: https://review.gluster.org/#/c/17105/
Note that there is only one thread per program. So, am wondering whether this thread can become performance bottleneck for Glusterfs program. Your comments are welcome.
regards,--
Raghavendra G
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