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Posted to oak-issues@jackrabbit.apache.org by "Michael Dürig (JIRA)" <ji...@apache.org> on 2018/03/14 15:24:00 UTC
[jira] [Commented] (OAK-7326) Add a way to disable the SegmentCache
[ https://issues.apache.org/jira/browse/OAK-7326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16398744#comment-16398744 ]
Michael Dürig commented on OAK-7326:
------------------------------------
FWIW, here some benchmarks demonstrating the effect of removing the segment cache. Roughly 2 orders of magnitude slower!
{noformat}
# ReadPropertyTest C min 10% 50% 90% max N
Oak-Segment-Tar 1 5 5 6 7 12 9870
Oak-Segment-Tar (cache=0) 1 504 517 526 544 601 114
# ConcurrentReadTest C min 10% 50% 90% max N
Oak-Segment-Tar 1 39 91 120 155 319 491
Oak-Segment-Tar (cache=0) 1 28792 28792 30139 30908 30908 3
{noformat}
> Add a way to disable the SegmentCache
> --------------------------------------
>
> Key: OAK-7326
> URL: https://issues.apache.org/jira/browse/OAK-7326
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Priority: Major
> Fix For: 1.9.0, 1.10
>
>
> We should implement a way to disable the segment cache. This enables us to establish performance baselines and better understand locality of reference without the distortion of the cache (e.g. see OAK-5655).
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