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https://issues.apache.org/jira/browse/CASSANDRA-20226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17927173#comment-17927173
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Benedict Elliott Smith commented on CASSANDRA-20226:
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One other perfectly workable option, btw, would be to allocate buffers from the
{{BufferPool}} TLAB to build the request, then to allocate a single ByteBuffer
from the Allocator, copy the contents of the thread local buffers to the new
ByteBuffer, then update the Cell buffers to point to the new backing positions.
This is sort of between the two approaches, but it requires messing with
ByteBuffer internals (but we do this elsewhere aplenty, so nothing stopping us).
This would be of manageable scope to pursue I think.
> Reduce contention in NativeAllocator.allocate
> ---------------------------------------------
>
> Key: CASSANDRA-20226
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20226
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Memtable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Attachments: cpu_profile_batch.html,
> image-2025-01-20-23-38-58-896.png, profile.yaml
>
>
> For a high insert batch rate it looks like we have a bottleneck in
> NativeAllocator.allocate probably caused by contention within the logic.
> !image-2025-01-20-23-38-58-896.png|width=300!
> [^cpu_profile_batch.html]
> The logic has at least the following 2 potential places to assess:
> # allocation cycle in MemtablePool.SubPool#tryAllocate. This logic has a
> while loop with a CAS, which can be non-efficient under a high contention,
> similar to CASSANDRA-15922 we can try to replace it with addAndGet (need to
> check if it does not break the allocator logic)
> # swap region logic in NativeAllocator.trySwapRegion (under a high insert
> rate 1MiB regions can be swapped quite frequently)
> Reproducing test details:
> * test logic
> {code:java}
> ./tools/bin/cassandra-stress "user profile=./profile.yaml no-warmup
> ops(insert=1) n=10m" -rate threads=100 -node somenode
> {code}
> * Cassandra version: 5.0.3
> * configuration changes compared to default:
> {code:java}
> memtable_allocation_type: offheap_objects
> memtable:
> configurations:
> skiplist:
> class_name: SkipListMemtable
> trie:
> class_name: TrieMemtable
> parameters:
> shards: 32
> default:
> inherits: trie
> {code}
> * 1 node cluster
> * OpenJDK jdk-17.0.12+7
> * Linux kernel: 4.18.0-240.el8.x86_64
> * CPU: 16 cores, Intel(R) Xeon(R) CPU E5-2680 v4 @ 2.40GHz
> * RAM: 46GiB
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