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https://issues.apache.org/jira/browse/CASSANDRA-21088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18046828#comment-18046828
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Dmitry Konstantinov commented on CASSANDRA-21088:
-------------------------------------------------
e2e test results (same test as here:
https://issues.apache.org/jira/browse/CASSANDRA-20226):
[^CASSANDRA-21088.html]
Profiles before and after are attached as well.
||Before||After||
|{code:java} op rate : 192,020 op/s [insert: 192,020 op/s]
partition rate : 192,020 pk/s [insert: 192,020 pk/s]
row rate : 1,920,200 row/s [insert: 1,920,200 row/s]
latency mean : 1.5 ms [insert: 1.5 ms]
latency median : 1.1 ms [insert: 1.1 ms]
latency 95th percentile : 2.6 ms [insert: 2.6 ms]
latency 99th percentile : 10.0 ms [insert: 10.0 ms]
latency 99.9th percentile : 29.1 ms [insert: 29.1 ms]
latency max : 438.6 ms [insert: 438.6 ms]
total gc count : 40
total gc memory : 384.516 GiB
total gc time : 7.5 seconds
avg gc time : 188.2 ms
stddev gc time : 56.3 ms
Total operation time : 00:01:18 {code}|{code:java}
op rate : 193,566 op/s [insert: 193,566 op/s]
partition rate : 193,566 pk/s [insert: 193,566 pk/s]
row rate : 1,935,661 row/s [insert: 1,935,661 row/s]
latency mean : 1.5 ms [insert: 1.5 ms]
latency median : 1.0 ms [insert: 1.0 ms]
latency 95th percentile : 2.5 ms [insert: 2.5 ms]
latency 99th percentile : 9.9 ms [insert: 9.9 ms]
latency 99.9th percentile : 28.3 ms [insert: 28.3 ms]
latency max : 1179.6 ms [insert: 1,179.6 ms]
total gc count : 36
total gc memory : 374.921 GiB
total gc time : 7.1 seconds
avg gc time : 196.6 ms
stddev gc time : 29.9 ms
Total operation time : 00:01:17 {code}|
> Minor perf optimizations around memtable put logic
> --------------------------------------------------
>
> Key: CASSANDRA-21088
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21088
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Memtable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 5.1
>
> Attachments: CASSANDRA-21088.html, memtable_after_v2_alloc.html,
> memtable_after_v2_cpu.html, memtable_before_alloc.html,
> memtable_before_cpu.html
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> * Avoid BTree iterators allocation in ColumnsCollector.update (0.3% of
> allocations)
> * reduce amount of virtual calls within Cell.dataSize (Cell.dataSize costs
> 1.62 % of CPU)
> * avoid capturing lambda allocation in BTreeRow.clone (0.59% of allocations)
> * Do not recalculate minLocalDeletionTime when BTreeRow is cloned (0.37 % of
> CPU)
> allocation/CPU are taken from profile data for batch write test (
> CASSANDRA-20226 )
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