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https://issues.apache.org/jira/browse/SOLR-10130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15865470#comment-15865470
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Ishan Chattopadhyaya commented on SOLR-10130:
---------------------------------------------
I ran some benchmarks, with and without this patch.
{code}
Benchmarking suite:
https://github.com/chatman/solr-upgrade-tests/blob/master/BENCHMARKS.md
Environment: packet.net, Type 0 server
(https://www.packet.net/bare-metal/servers/type-0/)
6.4.1 Without patch
------------------------
java -cp
target/org.apache.solr.tests.upgradetests-0.0.1-SNAPSHOT-jar-with-dependencies.jar:.
org.apache.solr.tests.upgradetests.SimpleBenchmarks -v
72f75b2503fa0aa4f0aff76d439874feb923bb0e -Nodes 1 -Shards 1 -Replicas 1
-numDocs 100000 -threads 6 -benchmarkType generalIndexing
Indexing times: 188,190
6.4.1 With patch
--------------------
java -cp
target/org.apache.solr.tests.upgradetests-0.0.1-SNAPSHOT-jar-with-dependencies.jar:.
org.apache.solr.tests.upgradetests.SimpleBenchmarks -v
72f75b2503fa0aa4f0aff76d439874feb923bb0e -patchUrl
https://issues.apache.org/jira/secure/attachment/12852444/SOLR-10130.patch
-Nodes 1 -Shards 1 -Replicas 1 -numDocs 100000 -threads 6 -benchmarkType
generalIndexing
Indexing times: 171,165
{code}
> Serious performance degradation in Solr 6.4.1 due to the new metrics
> collection
> -------------------------------------------------------------------------------
>
> Key: SOLR-10130
> URL: https://issues.apache.org/jira/browse/SOLR-10130
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: metrics
> Affects Versions: 6.4.1
> Environment: Centos 7, OpenJDK 1.8.0 update 111
> Reporter: Ere Maijala
> Assignee: Andrzej Bialecki
> Priority: Blocker
> Labels: perfomance
> Attachments: SOLR-10130.patch, solr-8983-console-f1.log
>
>
> We've stumbled on serious performance issues after upgrading to Solr 6.4.1.
> Looks like the new metrics collection system in MetricsDirectoryFactory is
> causing a major slowdown. This happens with an index configuration that, as
> far as I can see, has no metrics specific configuration and uses
> luceneMatchVersion 5.5.0. In practice a moderate load will completely bog
> down the server with Solr threads constantly using up all CPU (600% on 6 core
> machine) capacity with a load that normally where we normally see an average
> load of < 50%.
> I took stack traces (I'll attach them) and noticed that the threads are
> spending time in com.codahale.metrics.Meter.mark. I tested building Solr
> 6.4.1 with the metrics collection disabled in MetricsDirectoryFactory getByte
> and getBytes methods and was unable to reproduce the issue.
> As far as I can see there are several issues:
> 1. Collecting metrics on every single byte read is slow.
> 2. Having it enabled by default is not a good idea.
> 3. The comment "enable coarse-grained metrics by default" at
> https://github.com/apache/lucene-solr/blob/branch_6x/solr/core/src/java/org/apache/solr/update/SolrIndexConfig.java#L104
> implies that only coarse-grained metrics should be enabled by default, and
> this contradicts with collecting metrics on every single byte read.
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