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

Alexey I. Froloff raorn at raorn.name
Fri Jun 1 19:00:57 UTC 2012


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.


$ 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.

-- 
Regards,    --
Sir Raorn.   --- http://thousandsofhate.blogspot.com/
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