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https://issues.apache.org/jira/browse/CASSANDRA-7486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485579#comment-14485579
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Albert P Tobey commented on CASSANDRA-7486:
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This is with 2.0 / OpenJDK8 since that's what I had running. Same everything
each run except for heap size. cassandra-stress 2.1.4 read workload / 800
threads. I'll re-run with 2.1 / Oracle JDK8 and some mixed load.
-XX:+UseG1GC
Also: -XX:+UseTLAB -XX:+ResizeTLAB -XX:-UseBiasedLocking -XX:+AlwaysPreTouch
but maybe those should go in a different ticket.
8GB:
op rate : 139805
partition rate : 139805
row rate : 139805
latency mean : 5.7
latency median : 4.2
latency 95th percentile : 13.2
latency 99th percentile : 18.5
latency 99.9th percentile : 21.1
latency max : 303.8
512MB:
op rate : 114214
partition rate : 114214
row rate : 114214
latency mean : 7.0
latency median : 3.7
latency 95th percentile : 12.4
latency 99th percentile : 14.7
latency 99.9th percentile : 15.3
latency max : 307.1
256MB:
op rate : 60028
partition rate : 60028
row rate : 60028
latency mean : 13.3
latency median : 4.0
latency 95th percentile : 44.7
latency 99th percentile : 73.5
latency 99.9th percentile : 79.6
latency max : 1105.4
Same everything with mostly stock CMS settings for 2.0. I added the
-XX:+UseTLAB -XX:+ResizeTLAB -XX:-UseBiasedLocking -XX:+AlwaysPreTouch
settings to keep the numbers comparable to all of my other data.
8GB/1GB:
op rate : 119155
partition rate : 119155
row rate : 119155
latency mean : 6.7
latency median : 4.1
latency 95th percentile : 11.8
latency 99th percentile : 15.5
latency 99.9th percentile : 17.3
latency max : 520.2
512MB ( -XX:+UseAdaptiveSizePolicy):
op rate : 82375
partition rate : 82375
row rate : 82375
latency mean : 9.7
latency median : 4.3
latency 95th percentile : 28.2
latency 99th percentile : 49.4
latency 99.9th percentile : 54.8
latency max : 2642.6
256MB ( -XX:+UseAdaptiveSizePolicy):
op rate : 77705
partition rate : 77705
row rate : 77705
latency mean : 10.3
latency median : 4.8
latency 95th percentile : 33.6
latency 99th percentile : 45.3
latency 99.9th percentile : 49.1
latency max : 1990.0
> Compare CMS and G1 pause times
> ------------------------------
>
> Key: CASSANDRA-7486
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7486
> Project: Cassandra
> Issue Type: Test
> Components: Config
> Reporter: Jonathan Ellis
> Assignee: Shawn Kumar
> Fix For: 2.1.5
>
>
> See
> http://www.slideshare.net/MonicaBeckwith/garbage-first-garbage-collector-g1-7486gc-migration-to-expectations-and-advanced-tuning
> and https://twitter.com/rbranson/status/482113561431265281
> May want to default 2.1 to G1.
> 2.1 is a different animal from 2.0 after moving most of memtables off heap.
> Suspect this will help G1 even more than CMS. (NB this is off by default but
> needs to be part of the test.)
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