[ https://issues.apache.org/jira/browse/CASSANDRA-16036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17176693#comment-17176693 ]
David Capwell edited comment on CASSANDRA-16036 at 8/13/20, 4:13 PM: --------------------------------------------------------------------- Here are the results rerunning again (didn't populate data before test, relied on the same clusters) cluster 62 = with chunk cache cluster 63 = without chunk cache clustering slice: read rate: 11% !https://issues.apache.org/jira/secure/attachment/13009751/clustering-slice_latency_selects_baseline.png! !https://issues.apache.org/jira/secure/attachment/13009750/clustering-slice_latency_under90_selects_baseline.png! clustering in-clause: read rate: 11% !https://issues.apache.org/jira/secure/attachment/13009749/clustering-in-clause_latency_selects_baseline.png! !https://issues.apache.org/jira/secure/attachment/13009748/clustering-in-clause_latency_under90_selects_baseline.png! Attempt 3 !https://issues.apache.org/jira/secure/attachment/13009803/clustering-in-clause_latency_selects_baseline_attempt3.png! !https://issues.apache.org/jira/secure/attachment/13009802/clustering-in-clause_latency_under90_selects_baseline_attempt3.png! medium blob: Read rate: 100% !https://issues.apache.org/jira/secure/attachment/13009747/medium-blobs_latency_selects_baseline.png! !https://issues.apache.org/jira/secure/attachment/13009746/medium-blobs_latency_under90_selects_baseline.png! Partition single row read Read rate: 100% !https://issues.apache.org/jira/secure/attachment/13009745/partition-single-row-read_latency_selects_baseline.png! !https://issues.apache.org/jira/secure/attachment/13009744/partition-single-row-read_latency_under90_selects_baseline.png! was (Author: dcapwell): Here are the results rerunning again (didn't populate data before test, relied on the same clusters) cluster 62 = with chunk cache cluster 63 = without chunk cache clustering slice: read rate: 11% !https://issues.apache.org/jira/secure/attachment/13009751/clustering-slice_latency_selects_baseline.png! !https://issues.apache.org/jira/secure/attachment/13009750/clustering-slice_latency_under90_selects_baseline.png! clustering in-clause: read rate: 11% !https://issues.apache.org/jira/secure/attachment/13009749/clustering-in-clause_latency_selects_baseline.png! !https://issues.apache.org/jira/secure/attachment/13009748/clustering-in-clause_latency_under90_selects_baseline.png! Attempt 3 !https://issues.apache.org/jira/secure/attachment/13009803/clustering-in-clause_latency_selects_baseline_attempt3.png! medium blob: Read rate: 100% !https://issues.apache.org/jira/secure/attachment/13009747/medium-blobs_latency_selects_baseline.png! !https://issues.apache.org/jira/secure/attachment/13009746/medium-blobs_latency_under90_selects_baseline.png! Partition single row read Read rate: 100% !https://issues.apache.org/jira/secure/attachment/13009745/partition-single-row-read_latency_selects_baseline.png! !https://issues.apache.org/jira/secure/attachment/13009744/partition-single-row-read_latency_under90_selects_baseline.png! > Add flag to disable chunk cache and disable by default > ------------------------------------------------------ > > Key: CASSANDRA-16036 > URL: https://issues.apache.org/jira/browse/CASSANDRA-16036 > Project: Cassandra > Issue Type: Bug > Components: Legacy/Local Write-Read Paths > Reporter: David Capwell > Assignee: David Capwell > Priority: Normal > Fix For: 4.0-beta > > Attachments: clustering-in-clause_latency_selects_baseline.png, > clustering-in-clause_latency_selects_baseline_attempt3.png, > clustering-in-clause_latency_under90_selects_baseline.png, > clustering-in-clause_latency_under90_selects_baseline_attempt3.png, > clustering-slice_latency_selects_baseline.png, > clustering-slice_latency_under90_selects_baseline.png, > medium-blobs_latency_selects_baseline.png, > medium-blobs_latency_under90_selects_baseline.png, > partition-single-row-read_latency_selects_baseline.png, > partition-single-row-read_latency_under90_selects_baseline.png > > > Chunk cache is enabled by default and doesn’t have a flag to disable without > impacting networking. In performance testing 4.0 against 3.0 I found that > reads were slower in 4.0 and after profiling found that the ChunkCache was > partially to blame; after disabling the chunk cache, read performance had > improved. > {code} > 40_w_cc-selects.hdr > #[Mean = 11.50063, StdDeviation = 13.44014] > #[Max = 482.41254, Total count = 316477] > #[Buckets = 25, SubBuckets = 262144] > 40_wo_cc-selects.hdr > #[Mean = 9.82115, StdDeviation = 10.14270] > #[Max = 522.36493, Total count = 317444] > #[Buckets = 25, SubBuckets = 262144] > {code} -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org