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https://issues.apache.org/jira/browse/CASSANDRA-17240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17490045#comment-17490045
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Branimir Lambov commented on CASSANDRA-17240:
---------------------------------------------
The test also includes latency stages. Because of the incomplete compaction
this patch's latency results (which can be found in
[^density_test_with_sharding.html.gz]) can be misleading, thus I'm only showing
details and two graphs from the DataStax branch (full data in
[^density_SG.html.gz]):
{code:java}
SG-density-1TB-100byte 9fe6f629 2021-12-15 16:44:11 Note:
Trie/big/UCS-30threads-F16...latency_1_1:latency_1_1.result-success
---------------------------------------
Total Operations : 499999994
Op Rate : 107119 op/sec
Min Latency : 0.143 ms
Avg Latency : 1.930 ms
Median Latency : 0.996 ms
95th Latency : 4.281 ms
99th Latency : 10.438 ms
99.9th Latency : 227.140 ms
Max Latency : 524.632 ms
SG-density-1TB-100byte b90ea1ad 2021-12-15 16:15:56 Note:
SkipList/big/UCS-30threads-F16...latency_1_1.result-success
---------------------------------------
Total Operations : 499999994
Op Rate : 105537 op/sec
Min Latency : 0.152 ms
Avg Latency : 2.738 ms
Median Latency : 1.370 ms
95th Latency : 6.302 ms
99th Latency : 14.265 ms
99.9th Latency : 293.650 ms
Max Latency : 567.837 ms
{code}
!latency-1_1-95.png!
{code:java}
SG-density-1TB-100byte 9fe6f629 2021-12-15 16:44:11 Note:
Trie/big/UCS-30threads-F16...latency_9_1:latency_9_1.result-success
---------------------------------------
Total Operations : 499999940
Op Rate : 107616 op/sec
Min Latency : 0.138 ms
Avg Latency : 1.430 ms
Median Latency : 0.715 ms
95th Latency : 2.224 ms
99th Latency : 7.820 ms
99.9th Latency : 270.483 ms
Max Latency : 515.391 ms
SG-density-1TB-100byte b90ea1ad 2021-12-15 16:15:56 Note:
SkipList/big/UCS-30threads-F16...latency_9_1:latency_9_1.result-success
---------------------------------------
Total Operations : 499999940
Op Rate : 105789 op/sec
Min Latency : 0.148 ms
Avg Latency : 2.399 ms
Median Latency : 1.007 ms
95th Latency : 5.244 ms
99th Latency : 11.947 ms
99.9th Latency : 328.532 ms
Max Latency : 639.730 ms
{code}
!latency-9_1-95.png!
{code:java}
SG-density-1TB-100byte 9fe6f629 2021-12-15 16:44:11 Note:
Trie/big/UCS-30threads-F16...throughput:throughput.result-success
---------------------------------------
Total Operations : 9999999910
Op Rate : 245111 op/sec
Min Latency : 0.229 ms
Avg Latency : 8.854 ms
Median Latency : 7.139 ms
95th Latency : 17.499 ms
99th Latency : 28.672 ms
99.9th Latency : 274.366 ms
Max Latency : 1187.840 ms
SG-density-1TB-100byte b90ea1ad 2021-12-15 16:15:56 Note:
SkipList/big/UCS-30threads-F16...throughput:throughput.result-success
---------------------------------------
Total Operations : 9999997880
Op Rate : 107947 op/sec
Min Latency : 0.372 ms
Avg Latency : 20.273 ms
Median Latency : 16.723 ms
95th Latency : 31.178 ms
99th Latency : 105.595 ms
99.9th Latency : 337.592 ms
Max Latency : 18652.070 ms
{code}
Additionally, below are some JMH microbenchmarks of performing database reads
off the memtable:
{code:java}
SkipListMemtable in heap_buffers mode: 10000000 ops written in 89.949s,
5.700GiB (97%) on-heap, 0.000KiB (0%) off-heap
TrieMemtable in heap_buffers mode: 10000000 ops written in 35.515s,
4.568GiB (78%) on-heap, 0.000KiB (0%) off-heap
Benchmark (BATCH) (count) (flush)
(memtableClass) (threadCount) (useNet) Mode Cnt Score Error Units
ReadTestSmallPartitions.readFixed 1000 10000000 INMEM
SkipListMemtable 1 false avgt 10 3.610 ± 0.046 ms/op
ReadTestSmallPartitions.readFixed 1000 10000000 INMEM
TrieMemtable 1 false avgt 10 3.625 ± 0.061 ms/op
ReadTestSmallPartitions.readOutside 1000 10000000 INMEM
SkipListMemtable 1 false avgt 10 2.754 ± 0.027 ms/op
ReadTestSmallPartitions.readOutside 1000 10000000 INMEM
TrieMemtable 1 false avgt 10 2.306 ± 0.042 ms/op
ReadTestSmallPartitions.readRandomInside 1000 10000000 INMEM
SkipListMemtable 1 false avgt 10 8.332 ± 0.254 ms/op
ReadTestSmallPartitions.readRandomInside 1000 10000000 INMEM
TrieMemtable 1 false avgt 10 4.657 ± 0.094 ms/op
ReadTestSmallPartitions.readRandomWOutside 1000 10000000 INMEM
SkipListMemtable 1 false avgt 10 8.052 ± 0.058 ms/op
ReadTestSmallPartitions.readRandomWOutside 1000 10000000 INMEM
TrieMemtable 1 false avgt 10 4.690 ± 0.059 ms/op
SkipListMemtable in offheap_objects mode: 10000000 ops written in 91.642s,
3.688GiB (63%) on-heap, 534.058MiB (13%) off-heap
TrieMemtable in offheap_objects mode: 10000000 ops written in 36.363s,
2.719GiB (46%) on-heap, 862.752MiB (21%) off-heap
Benchmark (BATCH) (count) (flush)
(memtableClass) (threadCount) (useNet) Mode Cnt Score Error Units
ReadTestSmallPartitions.readFixed 1000 10000000 INMEM
SkipListMemtable 1 false avgt 10 4.631 ± 0.063 ms/op
ReadTestSmallPartitions.readFixed 1000 10000000 INMEM
TrieMemtable 1 false avgt 10 4.078 ± 0.044 ms/op
ReadTestSmallPartitions.readOutside 1000 10000000 INMEM
SkipListMemtable 1 false avgt 10 2.489 ± 0.009 ms/op
ReadTestSmallPartitions.readOutside 1000 10000000 INMEM
TrieMemtable 1 false avgt 10 2.368 ± 0.025 ms/op
ReadTestSmallPartitions.readRandomInside 1000 10000000 INMEM
SkipListMemtable 1 false avgt 10 8.921 ± 0.053 ms/op
ReadTestSmallPartitions.readRandomInside 1000 10000000 INMEM
TrieMemtable 1 false avgt 10 4.991 ± 0.066 ms/op
ReadTestSmallPartitions.readRandomWOutside 1000 10000000 INMEM
SkipListMemtable 1 false avgt 10 8.333 ± 0.046 ms/op
ReadTestSmallPartitions.readRandomWOutside 1000 10000000 INMEM
TrieMemtable 1 false avgt 10 4.953 ± 0.070 ms/op
{code}
> CEP-19: Trie memtable implementation
> ------------------------------------
>
> Key: CASSANDRA-17240
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17240
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Memtable
> Reporter: Branimir Lambov
> Priority: Normal
> Attachments: SkipListMemtable-OSS.png, TrieMemtable-OSS.png,
> density_SG.html.gz, density_test_with_sharding.html.gz, latency-1_1-95.png,
> latency-9_1-95.png, throughput_SG.png, throughput_apache.png
>
>
> Trie-based memtable implementation as described in CEP-19, built on top of
> CASSANDRA-17034 and CASSANDRA-6936.
> The implementation is available in this
> [branch|https://github.com/blambov/cassandra/tree/CASSANDRA-17240].
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