Re: setproctitle_fast()

From: Emre Hasegeli <emre(at)hasegeli(dot)com>
To: Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>
Cc: Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: setproctitle_fast()
Date: 2018-07-07 11:57:01
Message-ID: CAE2gYzy=g2iAhFA3yVQ+_ZgZsiBnGwF2S7BwFX4QOcvZneyeHg@mail.gmail.com
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> FreeBSD's setproctitle() is a bit slow because it contains a syscall
> or two, so people often run PostgreSQL with update_process_title set
> to off on that OS. That makes the user experience not quite as nice
> as Linux. As a weekend learn-me-some-kernel-hacking project I fixed
> that and got the patch committed to FreeBSD 12, though I was asked to
> use a new libc entry point _fast(). Here's a patch to teach
> PostgreSQL about that. It doesn't have much effect on small systems,
> but it makes "pgbench -c 40 -j 40 -S -M prepared" do ~10% more
> transactions per second on an AWS m4.10xlarge instance.

I am curious why they asked you to use a new libc entry point. The
function signatures are the same. More people could benefit from
making the existing function faster.

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