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image: Create zstd-compressed qcow2 images.

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This should be about twice as fast as the default zlib compressor used for
qcow2, and potentially multi-thread aware given some improvements to qemu-img
in the future (zstd supports its but it's not currently used by QEMU).

* gnu/build/image.scm (convert-disk-image): Specify 'compression_type=zstd'
option.

Change-Id: Ie9c66f0c13e789ec863c95a5e549f035b6a17bf9
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Maxim Cournoyer 2025-04-30 16:38:15 +09:00
parent ca8a0f4d1b
commit a0941c14ef
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gnu/build/image.scm
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@ -181,6 +181,7 @@ ROOT directory to populate the image."
;; The maximum number of co-routines is 16.
"-m" (number->string (min 16 (parallel-job-count)))
"-O" "qcow2"
"-o" "compression_type=zstd"
image output))
(else
(copy-file image output))))