GitHub user jacksontj opened a pull request:
https://github.com/apache/trafficserver/pull/670
TS-4485 schedule HostDBSyncer in ET_TASK threads instead of ET_NET threads
Since the syncer is on ET_NET threads this effectively means every sync
interval an ET_NET thread is blocked however long it takes to msync() your
partition to disk (meaning we are doing blocking IO in the ET_NET threads!!!).
What I'm seeing is in-flight requests and intercepts are stalled out
waiting on the ET_NET. This simply schedules the syncer on an ET_TASK thread,
although this make make syncs to disk slower (waiting longer on the lock) it
will mean we don't have to stall 1/nth of ET_NET threads waiting on a disk.
cc @SolidWallOfCode
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jacksontj/trafficserver TS-4485
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/trafficserver/pull/670.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 #670
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commit be315479d3d33d7452a90ecc1aa2f9f7664d443d
Author: Thomas Jackson <jacksontj...@gmail.com>
Date: 2016-05-26T05:36:21Z
TS-4485 schedule HostDBSyncer in ET_TASK threads instead of ET_NET threads
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