ab1bb9136b
Motivation: Currently we hold a lock on the PoolArena when we allocate / free PoolSubpages, which is wasteful as this also affects "normal" allocations. The same is true vice-verse. Modifications: Ensure we synchronize on the head of the PoolSubPages pool. This is done per size and so it is possible to concurrently allocate / deallocate PoolSubPages with different sizes, and also normal allocations. Result: Less condition and so faster allocation/deallocation. Before this commit: xxx:~/wrk $ ./wrk -H 'Connection: keep-alive' -d 120 -c 256 -t 16 -s scripts/pipeline-many.lua http://xxx:8080/plaintext Running 2m test @ http://xxx:8080/plaintext 16 threads and 256 connections Thread Stats Avg Stdev Max +/- Stdev Latency 17.61ms 29.52ms 689.73ms 97.27% Req/Sec 278.93k 41.97k 351.04k 84.83% 530527460 requests in 2.00m, 71.64GB read Requests/sec: 4422226.13 Transfer/sec: 611.52MB After this commit: xxx:~/wrk $ ./wrk -H 'Connection: keep-alive' -d 120 -c 256 -t 16 -s scripts/pipeline-many.lua http://xxx:8080/plaintext Running 2m test @ http://xxx:8080/plaintext 16 threads and 256 connections Thread Stats Avg Stdev Max +/- Stdev Latency 15.85ms 24.50ms 681.61ms 97.42% Req/Sec 287.14k 38.39k 360.33k 85.88% 547902773 requests in 2.00m, 73.99GB read Requests/sec: 4567066.11 Transfer/sec: 631.55MB This is reproducable every time. |
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| pom.xml | ||