7bf829ace1
This aims at further reducing the contention on the free_list when using global pools. The free_list pointer now appears for each bucket, and both the alloc and the release code skip to a next bucket when ending on a contended entry. The default entry used for allocations and releases depend on the thread ID so that locality is preserved as much as possible under low contention. It would be nice to improve the situation to make sure that releases to the shared pools doesn't consider the first entry's pointer but only an argument that would be passed and that would correspond to the bucket in the thread's cache. This would reduce computations and make sure that the shared cache only contains items whose pointers match the same bucket. This was not yet done. One possibility could be to keep the same splitting in the local cache. With this change, an h2load test with 5 * 160 conns & 40 streams on 80 threads that was limited to 368k RPS with the shared cache jumped to 3.5M RPS for 8 buckets, 4M RPS for 16 buckets, 4.7M RPS for 32 buckets and 5.5M RPS for 64 buckets. |
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