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From: Andres Freund <[email protected]>
To: Gregory Smith <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: Major pgbench synthetic SELECT workload regression, Ubuntu 23.04+PG15
Date: Thu, 8 Jun 2023 18:21:47 -0700
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAHLJuCVK9Rmxwh-0rmsrbO5-gaiOYsNCN=YE3uQ1ckQaq_YV_A@mail.gmail.com>
References: <CAHLJuCUFGcDb1OkBcLtuWoXv5aPbWMj9uSm3q-AR3CA9CcYp_Q@mail.gmail.com>
	<[email protected]>
	<CAHLJuCVK9Rmxwh-0rmsrbO5-gaiOYsNCN=YE3uQ1ckQaq_YV_A@mail.gmail.com>

Hi,

On 2023-06-08 20:20:18 -0400, Gregory Smith wrote:
> On Thu, Jun 8, 2023 at 6:18 PM Andres Freund <[email protected]> wrote:
> 
> > Could you get a profile with call graphs? We need to know what leads to all
> > those osq_lock calls.
> > perf record --call-graph dwarf -a sleep 1
> > or such should do the trick, if run while the workload is running.
> >
> 
> I'm doing something wrong because I can't find the slow part in the perf
> data; I'll get back to you on this one.

You might need to add --no-children to the perf report invocation, otherwise
it'll show you the call graph inverted.

- Andres

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