On 06/01/2012 03:00 PM, Alexey I. Froloff wrote:
How much memory do you have to be able to write 11GB to /tmp ???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. --
Stephen Clark NetWolves Director of Technology Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark@xxxxxxxxxxxxx http://www.netwolves.com |
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