Re: Poor performance using reftable with many refs

From: Patrick Steinhardt <ps@pks.im>
Date: Feb 13, 2025, 06:11 UTC
Message-ID: <Z62NFXja4CkrxSil@pks.im>
In-Reply-To: <Z602dzQggtDdcgCX@tapette.crustytoothpaste.net>

On Thu, Feb 13, 2025 at 12:01:59AM +0000, brian m. carlson wrote:

Show 5 quoted lines

> It takes about 30 times as long to perform using the reftable backend,
> which is concerning.  While this is a synthetic measurement, I had
> intended to use it to determine the performance characteristics of
> the reference update portion when pushing a large repository for the
> first time.

Interesting, that's an edge case I didn't yet see. I know about some cases where reftables are ~10% slower, but 30x slower is in a different ballpark.

> I admit I haven't done any other particular investigation as to what's
> going wrong here, but the behaviour is very noticeable so it may be easy
> to profile.

No worries, I'm already happy to have gotten the report in the first place :) I'll investigate, but probably won't get to it before next week.

Thanks!

Patrick