On Wed, Nov 24, 2021 at 2:18 AM Richard Purdie <[email protected]> wrote: > > On Wed, 2021-11-24 at 09:00 +0100, Alexander Kanavin wrote: > > But the AB has not been exhibiting any problems with zstd, and this will > > degrade performance. Let's only fix what is broken. > > I'm not sure I agree with that. > > We have 60+ "intermittent" bugs and some of us are in weekly meetings trying > to > do something about working out why these are failing. It feels like we're not > really getting too far with some subset of them and it is using up a lot of > the > SWAT and bug triage time. > > We've made a few changes to try and reduce the load spikes on the systems and > this fits with the other changes we've made. >
>From a different data point, we have clipped the parallelism for XZ and ZSTD internally to very low ( 2 and 4 ) and it has in fact reduced unexpected failures and seen no impact on build performance. Since parallelism settings are myopic for these tools, they greedily take every CPU which is not best for overall build thats doing many things in parallel, so its best to curtail them to a conservative value. > Cheers, > > Richard > > > > > >
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