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https://issues.apache.org/jira/browse/OAK-3850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15101839#comment-15101839
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Teodor Rosu commented on OAK-3850:
----------------------------------
Regarding timers:
First. I added a timer to the "readIfPresent in NodeCache" operation ( in the
test above where all the reads are served from the persistent cache ). Below
you can see the time spent in reading from cache.
org.apache.jackrabbit.oak.plugins.document.persistentCache.PersistentCacheStats.NODE.hitTimer,
count=98719774,
min=0.246,
max=10.925,
mean=0.4496718933147956,
stddev=0.4170056965106299,
median=0.41400000000000003,
p75=0.449,
p95=0.608,
p98=0.792,
p99=0.842,
p999=10.925,
mean_rate=1234535.2823771138,
m1=1206272.3707543525,
m5=1149945.882194646,
m15=1133372.9935419066,
rate_unit=events/second,
duration_unit=microseconds
Second. Is the entry load ( on cache miss ) Timer needed ( or very relevant )?
On persistent cache load operation oak will either hit the DocumentStore
memory/persistent cache which should be very fast OR the DocumentStore
(uncached) find operation which is considerably slower.
> Collect and expose Persistent Cache stats
> -----------------------------------------
>
> Key: OAK-3850
> URL: https://issues.apache.org/jira/browse/OAK-3850
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: core, documentmk
> Reporter: Teodor Rosu
> Attachments: OAK-3850-v0.patch, OAK-3850-v1.patch,
> test-performance-v0.patch
>
>
> Expose persistent cache statistics ( see: [Guava
> CacheStats|http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/cache/CacheStats.html]
> )
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