[Haskell-cafe] Cabal: Can only one processor core be used?

[Andrew Lelechenko]

I’ve been using semaphore concurrency builds since GHC 9.8 was released. Works like a charm, very nice, but yes, one has to build cabal-install HEAD or wait until cabal-3.12 is out (which is soon AFAIU).

Best regards,
Andrew


> On 2 Apr 2024, at 16:18, Brandon Allbery <allbery.b at gmail.com> wrote:
> 
> It's only in HEAD at present and will be in 3.12.
> 
> On Tue, Apr 2, 2024 at 8:07 AM Bryan Richter via Haskell-Cafe <haskell-cafe at haskell.org> wrote:
> BTW the "semaphore" solution mentioned was introduced in this
> proposal: https://github.com/ghc-proposals/ghc-proposals/pull/540
> 
> Looks like it may be present in the latest Cabal (3.10) and latest GHC
> (9.8)? I'm curious to know if anyone's using it yet. :)
> 
> 
> On Tue, 2 Apr 2024 at 14:50, Volker Wysk <post at volker-wysk.de> wrote:
> >
> > Am Dienstag, dem 02.04.2024 um 16:37 +0500 schrieb Alexey Vagarenko:
> > > Hi,
> > >
> > > There is -j flag for this:
> > > https://cabal.readthedocs.io/en/3.4/cabal-project.html#cfg-field-jobs
> >
> > Okay, great. But only whole packages will be compiled in parallel, as
> > Henning has pointed out.
> >
> > Cheers,
> > Volker
> >
> > > On Tue, Apr 2, 2024 at 4:23 PM Volker Wysk <post at volker-wysk.de> wrote:
> > > > Hi
> > > >
> > > > I've searched the web and the cabal user guide on how to use more
> > > > processor
> > > > cores for compilation via cabal. I couldn't find anything.
> > > >
> > > > It looks like only one processor core can be used with cabal, even
> > > > though
> > > > (I've read on the web) GHC supports parallel compilation.
> > > >
> > > > Cabal compilation times can be a pain. It can't be that you can use only
> > > > one
> > > > processor core with cabal, can it ..?
> > > >
> > > > Cheers,
> > > > Volker
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> 
> -- 
> brandon s allbery kf8nh
> allbery.b at gmail.com
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