[Issue 21560] md5 poor performance out of the box

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21560

Witold Baryluk <witold.baryluk+d at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|md5                         |md5 poor performance out of
                   |                            |the box

--- Comment #1 from Witold Baryluk <witold.baryluk+d at gmail.com> ---
100GB sparse file in tmpfs.

phobos:

009f07e9b8fb09a820dd180441502d46 
/usr/lib/live/mount/overlay/rw/var/lib/docker/devicemapper/devicemapper/data
real    3m23.589s


md5sum from Debian testing:

009f07e9b8fb09a820dd180441502d46 
/usr/lib/live/mount/overlay/rw/var/lib/docker/devicemapper/devicemapper/data
real    2m20.709s


32KiB buffers were used in both cases (confirmed by strace).

Code compiled in release mode, with optimisations enabled.

AMD ThreadRipper 2950X, water cooled. 128GB , quad channel DDR4-2933 memory.
Linux 5.10.4

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