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https://issues.apache.org/jira/browse/OAK-6912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16242229#comment-16242229
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Andrei Dulceanu edited comment on OAK-6912 at 11/7/17 3:49 PM:
---------------------------------------------------------------
[~mduerig], [~frm], thanks to both of you for valuable input!
I re-ran the benchmark, on both Oak versions (pre- and post- cache changes).
Here are the latest results:
|Oak 1.6 r1793527 (20170502)|{noformat}
CacheStats{hitCount=1449347, hitRate=0.81, missCount=343672, missRate=0.19,
requestCount=1793019, loadCount=343672, loadSuccessCount=343672,
loadExceptionCount=0, totalLoadTime=0 min, 37 sec, averageLoadPenalty=107982.59
ns, evictionCount=343672, elementCount=16, totalWeight=1.9 MB, maxWeight=104.9
MB}
{noformat}|
|Oak 1.6 r1793526 (20170502)|{noformat}
CacheStats{hitCount=4386797, hitRate=1.00, missCount=41, missRate=0.00,
requestCount=4386838, loadCount=41, loadSuccessCount=41, loadExceptionCount=0,
totalLoadTime=0 min, 0 sec, averageLoadPenalty=355328.93 ns, evictionCount=41,
elementCount=22, totalWeight=4.1 MB, maxWeight=104.9 MB}
{noformat}|
WDYT?
was (Author: dulceanu):
[~mduerig], [~frm], thanks to both of you for valuable input!
I re-run the benchmark, on both Oak versions (pre- and post- cache changes).
Here are the latest results:
|Oak 1.6 r1793527 (20170502)|{noformat}
CacheStats{hitCount=1449347, hitRate=0.81, missCount=343672, missRate=0.19,
requestCount=1793019, loadCount=343672, loadSuccessCount=343672,
loadExceptionCount=0, totalLoadTime=0 min, 37 sec, averageLoadPenalty=107982.59
ns, evictionCount=343672, elementCount=16, totalWeight=1.9 MB, maxWeight=104.9
MB}
{noformat}|
|Oak 1.6 r1793526 (20170502)|{noformat}
CacheStats{hitCount=4386797, hitRate=1.00, missCount=41, missRate=0.00,
requestCount=4386838, loadCount=41, loadSuccessCount=41, loadExceptionCount=0,
totalLoadTime=0 min, 0 sec, averageLoadPenalty=355328.93 ns, evictionCount=41,
elementCount=22, totalWeight=4.1 MB, maxWeight=104.9 MB}
{noformat}|
WDYT?
> Cold standby performance regression due to segment caching
> ----------------------------------------------------------
>
> Key: OAK-6912
> URL: https://issues.apache.org/jira/browse/OAK-6912
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segment-tar, tarmk-standby
> Affects Versions: 1.7.0
> Reporter: Andrei Dulceanu
> Assignee: Andrei Dulceanu
> Labels: cold-standby, performance, scalability
> Fix For: 1.8, 1.7.12
>
>
> The changes to the segment cache introduced in r1793527 [0] introduced a
> performance regression on the primary for the case in which a standby is
> attached to it. Below a benchmark duration comparison between primary w/o and
> w/ standby for r1793527 (after the segment cache changes) and r1793526
> (before the changes) :
> |Oak 1.6 r1793527 (20170502)|{noformat}
> # BasicWriteTest C min 10% 50% 90% max
> N
> Oak-Segment-Tar 1 19 21 22 26 160
> 2491
> Oak-Segment-Tar-DS 1 56 59 63 70 181
> 919
> Oak-Segment-Tar-Cold(Shared DS) 1 58 66 159 177 372
> 302
> {noformat}|
> |Oak 1.6 r1793526 (20170502)|{noformat}
> # BasicWriteTest C min 10% 50% 90% max
> N
> Oak-Segment-Tar 1 19 21 22 25 52
> 2584
> Oak-Segment-Tar-DS 1 56 60 63 69 158
> 925
> Oak-Segment-Tar-Cold(Shared DS) 1 57 60 64 70 122
> 915
> {noformat}|
> [0]
> https://github.com/apache/jackrabbit-oak/commit/efafa4e1710621b7f3b8e92d0b2681669185fcd4
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