netty: provide an option to lower netty allocator chunk size from 16MB to 2MB #6407
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ejona86
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Nov 11, 2019
…ted by system property
zhangkun83
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zhangkun83
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ericgribkoff
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Dec 6, 2019
…B to 2MB (grpc#6407) This would reduce the amount of direct buffer allocations, especially with light traffic. This should mitigate internal issue b/143075435 The change is currently optional and is only effective if system property "io.grpc.netty.useCustomAllocator" is set to "true" ignoring the case. Internal benchmark results (median of 5 runs) doesn't show any significant change: ``` Before (STDEV) After (STDEV) grpc-java-java-multi-qps-integrity_only Actual QPS 717,848 (7,445) 715,061 (2,122) QPS per Client CPU 23,768 (799) 23,842 (295) grpc-java-java-multi-throughput-integrity_only Actual QPS 35,631 (204) 35,298 (25) QPS per Client CPU 3,362 (56) 3,316 (18) grpc-java-java-single-latency-integrity_only Median latency (us) 130 (1.82) 125 (5.36) grpc-java-java-single-throughput-integrity_only Actual QPS 593 (5.14) 587 (3.76) QPS per Client CPU 502 (4.51) 494 (6.92) ```
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This would reduce the amount of direct buffer allocations, especially with light traffic. This should mitigate internal issue b/143075435
The change is currently optional and is only effective if system property "io.grpc.netty.useCustomAllocator" is set to "true" ignoring the case.
Internal benchmark results (median of 5 runs) doesn't show any significant change: