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bug#20029: 'yes' surprisingly slow
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From: |
Ole Tange |
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Subject: |
bug#20029: 'yes' surprisingly slow |
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Date: |
Tue, 10 Mar 2015 22:18:23 +0100 |
On Tue, Mar 10, 2015 at 1:31 AM, Giuseppe Scrivano <address@hidden> wrote:
> $ time src/yes `echo {1..2000}` | head -c 2000M | md5sum
> 55c293324aa6ecce14f0bf30da5a4686 -
>
> real 0m7.994s
> user 0m11.093s
> sys 0m2.953s
>
> versus (with the patch):
>
> $ time src/yes `echo {1..2000}` | head -c 2000M | md5sum
> 55c293324aa6ecce14f0bf30da5a4686 -
>
> real 0m3.534s
> user 0m4.164s
> sys 0m1.803s
Are you sure your are not limited by md5sum?
$ time yes "`echo {1..2000}`" | head -c 2000M >/dev/null
real 0m0.660s
user 0m0.180s
sys 0m1.115s
The solution should perform no worse than that.
/Ole