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https://issues.apache.org/jira/browse/CASSANDRA-19429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17820624#comment-17820624
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Stefan Miklosovic commented on CASSANDRA-19429:
-----------------------------------------------
[CASSANDRA-19429-4.1|https://github.com/instaclustr/cassandra/tree/CASSANDRA-19429-4.1]
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java11_pre-commit_tests
✓ j11_build 1m 32s
✓ j11_cqlsh_dtests_py3 5m 24s
✓ j11_cqlsh_dtests_py311 5m 36s
✓ j11_cqlsh_dtests_py311_vnode 5m 31s
✓ j11_cqlsh_dtests_py38 5m 32s
✓ j11_cqlsh_dtests_py38_vnode 5m 29s
✓ j11_cqlsh_dtests_py3_vnode 5m 30s
✓ j11_cqlshlib_cython_tests 7m 8s
✓ j11_cqlshlib_tests 6m 12s
✓ j11_dtests 32m 23s
✓ j11_dtests_vnode 34m 47s
✓ j11_jvm_dtests 15m 20s
✓ j11_jvm_dtests_vnode 12m 21s
✕ j11_unit_tests 7m 38s
org.apache.cassandra.cql3.MemtableSizeTest testSize[skiplist]
java11_separate_tests
java8_pre-commit_tests
java8_separate_tests
{noformat}
[java11_pre-commit_tests|https://app.circleci.com/pipelines/github/instaclustr/cassandra/3927/workflows/1740b3e0-8813-4a29-89fe-7a0fb951231f]
[java11_separate_tests|https://app.circleci.com/pipelines/github/instaclustr/cassandra/3927/workflows/d1dd4431-caeb-4f55-985d-4720311c000f]
[java8_pre-commit_tests|https://app.circleci.com/pipelines/github/instaclustr/cassandra/3927/workflows/11197ae4-9546-4751-a9f2-c4b05de555aa]
[java8_separate_tests|https://app.circleci.com/pipelines/github/instaclustr/cassandra/3927/workflows/47a3a7a0-6fdd-4b9f-8cdf-4c620c802b0f]
> Remove lock contention generated by getCapacity function in SSTableReader
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-19429
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19429
> Project: Cassandra
> Issue Type: Bug
> Components: Local/SSTable
> Reporter: Dipietro Salvatore
> Assignee: Dipietro Salvatore
> Priority: Normal
> Fix For: 4.0.x, 4.1.x
>
> Attachments: asprof_cass4.1.3__lock_20240216052912lock.html
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Profiling Cassandra 4.1.3 on large AWS instances, a high number of lock
> acquires is measured in the `getCapacity` function from
> `org/apache/cassandra/cache/InstrumentingCache` (1.9M lock acquires per 60
> seconds). Based on our tests on r8g.24xlarge instances (using Ubuntu 22.04),
> this limits the CPU utilization of the system to under 50% when testing at
> full load and therefore limits the achieved throughput.
> Removing the lock contention from the SSTableReader.java file by replacing
> the call to `getCapacity` with `size` achieves up to 2.95x increase in
> throughput on r8g.24xlarge and 2x on r7i.24xlarge:
> |Instance type|Cass 4.1.3|Cass 4.1.3 patched|
> |r8g.24xlarge|168k ops|496k ops (2.95x)|
> |r7i.24xlarge|153k ops|304k ops (1.98x)|
>
> Instructions to reproduce:
> {code:java}
> ## Requirements for Ubuntu 22.04
> sudo apt install -y ant git openjdk-11-jdk
> ## Build and run
> CASSANDRA_USE_JDK11=true ant realclean && CASSANDRA_USE_JDK11=true ant jar &&
> CASSANDRA_USE_JDK11=true ant stress-build && rm -rf data && bin/cassandra -f
> -R
> # Run
> bin/cqlsh -e 'drop table if exists keyspace1.standard1;' && \
> bin/cqlsh -e 'drop keyspace if exists keyspace1;' && \
> bin/nodetool clearsnapshot --all && tools/bin/cassandra-stress write
> n=10000000 cl=ONE -rate threads=384 -node 127.0.0.1 -log file=cload.log
> -graph file=cload.html && \
> bin/nodetool compact keyspace1 && sleep 30s && \
> tools/bin/cassandra-stress mixed ratio\(write=10,read=90\) duration=10m
> cl=ONE -rate threads=406 -node localhost -log file=result.log -graph
> file=graph.html
> {code}
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