Quoting Helmut Grohne (2021-06-03 07:41:07) > On Wed, Jun 02, 2021 at 05:07:16PM +0200, Alex Muntada wrote: > > This reminded me of my using of ccache and eatmydata in sbuild. They > > may not be relevant for the context of mdbp depending on the > > resources available for building, indeed. > > > > I'm pretty fond of them because they speed up a lot some heavy > > builds on my laptop, therefore I'd appreciate to have some speed > > toggles in any service where I want to send those builds to. > > TL;DR: Don't add speedup flags, make it fast by default. > > I don't think speedups are relevant for any of the prospective users. > ccache either needs a small set of packages or a huge cache directory > to perform well. For many use cases (rebootstrap in particular), the > toolchain changes frequently, so the cache would have to be > invalidated very often. Most mdbp users would work with at least > hundreds of packages. > > As for eatmydata, I don't think that adding this as toggle is useful. > After all, we don't want eatmydata to have any influence on the build. > So a mdbp backend can just unconditionally enable it if it makes sense > without concerning a prospective user of the API. > > A very reliably alternative to eatmydata is building on tmpfs with a > huge swap partition. It also performs significantly better than > eatmydata in my experience as it fully eliminates the need to write to > disk a lot of the time. > > When you use pbuilder's "extract tarball" approach or a type=file > schroot with sbuild on a tmpfs (optionally speeding things up by using > zstd as compressor), the chroot setup can feel quite instantaneous. > > Ultimately, speedups should just become the default for the benefit of > everyone rather than opt-in. If I remember correctly, pbuilder now > defaults to disable man database generation via debconf, which also > provides a useful speedup. I think those are more accurately described as "trade-off flags" and that your argument is to limit the scope of tools instead of supporting a wider variety of needs. Most notably, ccache is a tradeoff between speed+cost of network bandwidth versus local disk space. I agree that any speedup without tradeoff should be just enabled by default. And sure, a frontend wrapper tool may not need to care about some options, if possible to configure the backend independently. - Jonas -- * Jonas Smedegaard - idealist & Internet-arkitekt * Tlf.: +45 40843136 Website: http://dr.jones.dk/ [x] quote me freely [ ] ask before reusing [ ] keep private
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