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From: Трофимов Иван <[email protected]>
To: [email protected] <[email protected]>
Subject: About default inBufSize (connection read buffer size) in libpq
Date: Sun, 05 Mar 2023 05:42:06 +0300
Message-ID: <[email protected]> (raw)

<div>Hi!</div><div> </div><div>I was running some benchmarks for PG driver built on top of libpq async functionality,</div><div>and noticed that recv syscalls issued by the application are limited by 16Kb, which seems to</div><div>be inBufSize coming from makeEmptyPGconn in interfaces/libpq/fe-connect.c.</div><div> </div><div>Hacking that to higher values allowed my benchmarks to issue drastically less syscalls</div><div>when running some heavy selects, both in local and cloud environments, which made them</div><div>significantly faster.</div><div> </div><div>I believe there is a reason for that value to be 16Kb, but i was wondering if it's safe to change</div><div>this default to user-provided value, and if it is - could this functionality be added into API?</div>

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