Tom, Andres,
I spun up a 64-core Graviton2 instance (where I reported seeing improvement with this patch) and ran the provided
regressiontest with and without my proposed on top of mainline PG. I ran 4 runs each of 63 workers where we should see
themost contention and most impact from the patch. I am reporting the average and standard deviation, the average with
thepatch is 10% lower latency, but there is overlap in the standard deviation. I'll gather additional data at lower
workercounts and post later to see what the trend is.
Cmd: postgres=# SELECT test_shm_mq_pipelined(16384, 'xyzzy', 10000000, workers);
Avg +/- standard dev
63 workers w/o patch: 552443ms +/- 22841ms
63 workers w/ patch: 502727 +/- 45253ms
Best results
w/o patch: 521216ms
w/ patch: 436442ms
Thanks,
Geoff
