Re: Major pgbench synthetic SELECT workload regression, Ubuntu 23.04+PG15

There is no mention of perf or similar utilities in pgbench-tools
docs. I'm guessing Linux is the primary platform pgbench-tools gets
used on most. If so, I think it'd be useful to mention these tools and
snippets in there to make others lives easier.

That's a good idea.  I've written out guides multiple times for customers who are crashing and need to learn about stack traces, to help them becomes self-sufficient with the troubleshooting parts it's impractical for me to do for them.  If I can talk people through gdb, I can teach them perf.  I have a lot of time to work on pgbench-tools set aside this summer, gonna finally deprecate the gnuplot backend and make every graph as nice as the ones I shared here.

I haven't been aggressive about pushing perf because a lot of customers at Crunchy--a disproportionately larger number than typical I suspect--have operations restrictions that just don't allow DBAs direct access to a server's command line.  So perf commands are just out of reach before we even get to the permissions it requires.  I may have to do something really wild to help them, like see if the right permissions setup would allow PL/python3 or similar to orchestrate a perf session in a SQL function.