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https://issues.apache.org/jira/browse/OAK-4936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15588079#comment-15588079
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Michael Dürig commented on OAK-4936:
------------------------------------
Some benchmarks showing the impact of this fix together with the fixes from
OAK-4953 and OAK-4923:
{noformat}
$ uname -a
Darwin mduerig-MacBookPro1 15.6.0 Darwin Kernel Version 15.6.0: Thu Jun 23
18:25:34 PDT 2016; root:xnu-3248.60.10~1/RELEASE_X86_64 x86_64
$ java -version
java version "1.8.0_66"
Java(TM) SE Runtime Environment (build 1.8.0_66-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)
$ java -Xmx2g -Druntime=300 -jar oak-run-1.6-SNAPSHOT.jar benchmark
ConcurrentReadWriteTest ConcurrentWriteTest ConcurrentCreateNodesTest Oak-Tar
Oak-Segment-Tar
Apache Jackrabbit Oak 1.6-SNAPSHOT
# ConcurrentReadWriteTest C min 10% 50% 90% max
N
Oak-Tar 1 41 125 145 167 489
2047
Oak-Segment-Tar (base) 1 64 164 190 214 2362
1477
Oak-Segment-Tar (fix) 1 59 145 171 195 887
1751
# ConcurrentWriteTest C min 10% 50% 90% max
N
Oak-Tar 1 38 52 54 59 492
5461
Oak-Segment-Tar (base) 1 106 116 298 572 1570
931
Oak-Segment-Tar (fix) 1 91 108 115 130 908
2506
# ConcurrentCreateNodesTest C min 10% 50% 90% max
N
Oak-Tar 1 383 430 479 553 903
620
Oak-Segment-Tar (base) 1 699 731 1099 1319 1873
275
Oak-Segment-Tar (fix) 1 699 737 893 1036 1733
324
{noformat}
> Too many segment cache misses
> -----------------------------
>
> Key: OAK-4936
> URL: https://issues.apache.org/jira/browse/OAK-4936
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Labels: performance
> Fix For: Segment Tar 0.0.16
>
> Attachments: OAK-4936-monitoring.patch
>
>
> Running the {{ConcurrentWriteTest}} benchmark and monitoring the hits and
> misses of the segment cache (LIRS), I noticed that some segments are loaded
> over and over again (up to 3000 times).
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