[HEADS-UP] Rawhide: /tmp is now on tmpfs

[Steve Clark]

On 06/01/2012 03:00 PM, Alexey I. Froloff wrote:
> On Fri, Jun 01, 2012 at 01:50:55PM -0500, Michael Cronenworth wrote:
>> Not a single person who has claimed a performance or semantic win for
>> this /tmp move has replied when asked for proof.
> $ time dd if=/dev/zero of=/tmp/file bs=1M count=10240
> 10240+0 records in
> 10240+0 records out
> 10737418240 bytes (11 GB) copied, 4.95536 s, 2.2 GB/s
> dd if=/dev/zero of=/tmp/file bs=1M count=10240  0.00s user 3.44s system 69% cpu 4.956 total
>
> No visual shanges in system behavior.
>
How much memory do you have to be able to write 11GB to /tmp ???
> $ time dd if=/dev/zero of=/var/tmp/file bs=1M count=10240
> 10240+0 records in
> 10240+0 records out
> 10737418240 bytes (11 GB) copied, 59.2188 s, 181 MB/s
> dd if=/dev/zero of=/var/tmp/file bs=1M count=10240  0.00s user 54.26s system 91% cpu 59.239 total
>
> SSD disk.  System becomes unresponsive for a couple of tens of seconds.
>
>
> $ time dd if=/dev/zero of=$HOME/file bs=1M count=10240
> 10240+0 records in
> 10240+0 records out
> 10737418240 bytes (11 GB) copied, 75.1548 s, 143 MB/s
> dd if=/dev/zero of=$HOME/file bs=1M count=10240  0.01s user 71.30s system 94% cpu 1:15.16 total
>
> SATA disk.  System becomes less responsive for a couple of seconds.
>
>
> Does that counts as a proof?  ext4 on /var and /home.
>


-- 
Stephen Clark
*NetWolves*
Director of Technology
Phone: 813-579-3200
Fax: 813-882-0209
Email: steve.clark at netwolves.com
http://www.netwolves.com
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