Re: SHA256 performance with Guile 2.2 vs. Guile 3.0

["Ludovic Courtès" <ludo@gnu.org>]

Hi,

Brendan Tildesley <mail@brendan.scot> skribis:

>> Still far from the libgcrypt implementation in C + asm, but hey!
>
> Actually guix hash is still a lot slower than using the sha256sum cli
> tool. For me 7x faster for the guile tarball, and 4x faster for a
> 700MiB file. Maybe because guile opens a file with it's ports and
> feeds it to libgcrypt. If guix is heavy relying on hashing files
> stored in the filesystem, maybe it would be better to directly use
> sha256sum or perhaps libgcrypt has a function do open a file and hash
> it on it's own?

We’d need to look at the specifics, but given that “guix hash
guile-2.2.6.tar.xz” takes less than 0.1s, the timing difference you see
between “guix hash” and “sha256sum” is likely due to the startup time of
the “guix” command.

Ludo’.