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Commitfa604e0

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pgbench: When using pipelining only do PQconsumeInput() when necessary.
Up to now we did a PQconsumeInput() for each pipelined query, asking the OSfor more input - which it often won't have, as all results might already havebeen sent. That turns out to have a noticeable performance impact.Alvaro Herrera reviewed the idea to add the PQisBusy() check, but not thisconcrete patch.Author: Andres Freund <andres@anarazel.de>Discussion:https://postgr.es/m/20210720180039.23rivhdft3l4mayn@alap3.anarazel.deBackpatch: 14, where libpq/pgbench pipelining was introduced.
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‎src/bin/pgbench/pgbench.c

Lines changed: 8 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3460,7 +3460,14 @@ advanceConnectionState(TState *thread, CState *st, StatsData *agg)
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*/
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caseCSTATE_WAIT_RESULT:
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pg_log_debug("client %d receiving",st->id);
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if (!PQconsumeInput(st->con))
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/*
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* Only check for new network data if we processed all data
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* fetched prior. Otherwise we end up doing a syscall for each
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* individual pipelined query, which has a measurable
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* performance impact.
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*/
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if (PQisBusy(st->con)&& !PQconsumeInput(st->con))
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{
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/* there's something wrong */
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commandFailed(st,"SQL","perhaps the backend died while processing");

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