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Re: SHA256 performance with Guile 2.2 vs. Guile 3.0

From: Ludovic Courtès
Subject: Re: SHA256 performance with Guile 2.2 vs. Guile 3.0
Date: Wed, 08 Jan 2020 22:20:58 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)


Brendan Tildesley <address@hidden> 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.


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