mirror of https://github.com/citusdata/citus.git
feb5534c65
Before this commit, we created an additional WaitEventSet for checking whether the remote socket is closed per connection - only once at the start of the execution. However, for certain workloads, such as pgbench select-only workloads, the creation/deletion of the additional WaitEventSet adds ~7% CPU overhead, which is also reflected on the benchmark results. With this commit, we use the same WaitEventSet for the purposes of checking the remote socket at the start of the execution. We use "rebuildWaitEventSet" flag so that the executor can re-use the existing WaitEventSet. As a result, we see the following improvements on PG 15: main : 120051 tps, 0.532 ms latency avg. avoid_wes_rebuild: 127119 tps, 0.503 ms latency avg. And, on PG 14, as expected, there is no difference main : 129191 tps, 0.495 ms latency avg. avoid_wes_rebuild: 129480 tps, 0.494 ms latency avg. But, note that PG 15 is slightly (~1.5%) slower than PG 14. That is probably the overhead of checking the remote socket. |
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| backend | ||
| bin/pg_send_cancellation | ||
| include | ||
| test | ||