Hello hackers, 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'll park this patch here until the FreeBSD feature escapes in a RELEASE version in a few months. For anyone interested, https://wiki.postgresql.org/wiki/FreeBSD has some notes on this and other such things. -- Thomas Munro http://www.enterprisedb.com
0001-Use-setproctitle_fast-to-update-the-ps-status-if-ava.patch
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