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doc: remove obsolete performance comment

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sha512sum can be faster than sha256sum.
E.g., ‘dd if=/dev/zero bs=1024k count=1024 | time sha256sum’
reports 8.16 user CPU seconds on my host, whereas sha512sum
consumes 5.45 seconds (Fedora x86-64 on an AMD Phenom II X4 910e).
Although sha512sum is still considerably slower on x86, a good
chunk of uses are on 64-bit hosts and anyway there’s little point
to scaring people away from sha512sum nowadays.
* doc/coreutils.texi (sha2 utilities): Remove obsolete comment.
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Paul Eggert
2015-10-16 12:05:58 -07:00
parent e8d7e20530
commit 0cb602e33a
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@@ -3948,9 +3948,6 @@ these commands are precisely the same as for @command{md5sum}
and @command{sha1sum}.
@xref{md5sum invocation}.
Note: The SHA384 and SHA512 digests are considerably slower to
compute, especially on 32-bit computers, than SHA224 or SHA256.
@node Operating on sorted files
@chapter Operating on sorted files