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https://issues.apache.org/jira/browse/IGNITE-22544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17859613#comment-17859613
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Ivan Bessonov commented on IGNITE-22544:
----------------------------------------
According to
{{{}org.apache.ignite.internal.benchmarks.UpdateCommandsMarshalingMicroBenchmark{}}}.
Before:
{code:java}
Benchmark (payloadSize) (updateAll)
Mode Cnt Score Error Units
UpdateCommandsMarshalingMicroBenchmark.marshal 128 false
thrpt 5 2361.249 ± 66.884 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 128 true
thrpt 5 52.377 ± 3.769 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 2048 false
thrpt 5 1713.443 ± 331.795 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 2048 true
thrpt 5 14.916 ± 2.230 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 8192 false
thrpt 5 833.372 ± 227.738 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 8192 true
thrpt 5 3.281 ± 0.906 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 128 false
thrpt 5 2090.845 ± 792.226 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 128 true
thrpt 5 51.393 ± 16.872 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 2048 false
thrpt 5 2188.459 ± 69.423 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 2048 true
thrpt 5 52.705 ± 2.771 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 8192 false
thrpt 5 2174.810 ± 61.331 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 8192 true
thrpt 5 53.805 ± 1.000 ops/ms {code}
After:
{code:java}
Benchmark (payloadSize) (updateAll)
Mode Cnt Score Error Units
UpdateCommandsMarshalingMicroBenchmark.marshal 128 false
thrpt 5 4389.765 ± 66.332 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 128 true
thrpt 5 79.684 ± 0.965 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 2048 false
thrpt 5 2754.506 ± 58.151 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 2048 true
thrpt 5 17.435 ± 0.267 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 8192 false
thrpt 5 1066.381 ± 10.254 ops/ms
UpdateCommandsMarshalingMicroBenchmark.marshal 8192 true
thrpt 5 3.389 ± 0.688 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 128 false
thrpt 5 2782.648 ± 173.791 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 128 true
thrpt 5 69.952 ± 9.109 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 2048 false
thrpt 5 2752.568 ± 50.796 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 2048 true
thrpt 5 63.721 ± 2.902 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 8192 false
thrpt 5 2676.343 ± 1209.184 ops/ms
UpdateCommandsMarshalingMicroBenchmark.unmarshal 8192 true
thrpt 5 62.139 ± 17.144 ops/ms {code}
Short summary:
* Depending on the number of byte arrays inside of the message (which can't be
optimized), marshaling became from 0% to 85% faster according to created
benchmark, due to a combination of a lot of different optimizations, such as
** avoiding the creation of serializers
** simpler and slightly faster byte buffers pool
** better binary UUID format
** low-level stuff in direct stream
** better {{writeVarInt}} / {{writeVarLong}}
* If we take a look at the flamegraph, we could see that serialization itself
is about 1.5-2.0 times slower than the following {{{}Arrays.copyOf{}}}, which
is pretty good in my opinion.
* Reading speed wasn't so thoroughly checked in this issue, I created another
one: https://issues.apache.org/jira/browse/IGNITE-22559
Overall, reading speed doesn't depend on the size of individual byte buffers,
because we simple wrap the original array. Other then that, current
optimizations show 15%-35% increase in deserialization speed, due to
** {{...StreamImplV1}} optimizations
** faster {{readInt}} / {{readLong}}
** better binary UUID format
* Further optimizations for reads are required. Here I mostly focused on
writing speed. Reading speed turned out to be worse than writing speed for
small commands, I don't like it.
> Commands marshalling appears to be slow
> ---------------------------------------
>
> Key: IGNITE-22544
> URL: https://issues.apache.org/jira/browse/IGNITE-22544
> Project: Ignite
> Issue Type: Improvement
> Reporter: Ivan Bessonov
> Assignee: Ivan Bessonov
> Priority: Major
> Labels: ignite-3
> Attachments: IGNITE-22544.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We should benchmark the way we marshal commands using optimized marshaller
> and make it faster. Some obvious places:
> * byte buffers pool - we can replace queue with a manual implementation of
> Treiber stack, it's trivial and doesn't use as many CAS/volatile operations
> * new serializers are allocated every time, but they can be put into static
> final constants instead, or cached in fields of corresponding factories
> * we can create a serialization factory per group, not per message, this way
> we will remove unnecessary indirection. Group factory can use {{{}switch{}}},
> like in Ignite 2, which would basically lead to static dispatch of
> deserializer constructors and static access to serializers, instead of
> dynamic dispatch (virtual call), which should be noticeably faster
> * profiler might show other simple places, we must also compare
> {{OptimizedMarshaller}} against other serialization algorithms in benchmarks
> EDIT: quick draft attached, it addresses points 1 and 2.
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