On 13/03/2021 20:37, Jim Meyering wrote:
On Sat, Mar 13, 2021 at 10:19 AM Pádraig Brady <p...@draigbrady.com> wrote:
On 13/03/2021 16:13, Pádraig Brady wrote:
FYI testing on an older i3-2310M system
shows the bottleneck is not near I/O (cat is much faster).
A 500MiB file improves from 1.40s to 0.67s on the i3-2310M.
$ time src/cksum file.in
3404199294 524288000 file.in
real 0m0.672s
user 0m0.584s
sys 0m0.084s
I'm also considering applying the attached
to add a --debug option (present on a few other coreutils),
which will diagnose the implementation used
(since it's build time and run time variable).
I like the new option, and the patch looks fine.
I assume you'll mention the addition in NEWS.
Thanks for the reminder. I've adjusted like:
diff --git a/NEWS b/NEWS
index aad05df6d..5368a3eed 100644
--- a/NEWS
+++ b/NEWS
@@ -70,7 +70,9 @@ GNU coreutils NEWS -*-
outline -*-
cat --show-ends will now show \r\n as ^M$. Previously the \r was taken
literally, thus overwriting the first character in the line with '$'.
- cksum is now up to 4 times faster by using a slice by 8 algorithm.
+ cksum is now up to 4 times faster by using a slice by 8 algorithm,
+ and up to 8 times faster where pclmul instructions are supported.
+ A new --debug option will indicate if pclmul is being used.
df now recognizes these file systems as remote:
acfs, coda, fhgfs, gpfs, ibrix, ocfs2, and vxfs.
