Subject: Re: bug#43757: cuirass: Fail to fetch "guix" input.

From: Mathieu Othacehe <[email-masked]>
Date: Sat, 03 Oct 2020 15:14:09 +0200

Hey Ludo,

> ‘par-map’ is implemented in terms of futures, and futures use their own
> thread pool.  What’s likely to block is ‘touch’: it essentially waits on
> a condition variable, which Fibers cannot interrupt.

I see, thanks for explaining.

> Why not just replace ‘par-map’ with ‘map’?  That sounds easier and I
> suspect it doesn’t change much performance-wise.

The objective was to still be able to run parallel input fetching, but
you're right, a simple "map" is nicer.

> (There’s a 2nd use of ‘par-map’ in that file.)

Oh! Fixed too.

Thanks for the quick answer,

Mathieu