On Fri, Jun 01, 2012 at 11:00:57PM +0400, 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. I assume that your /tmp is on tmpfs; on all of *my* computers this command would fail because the tmpfs would be too limited to store a 10GB file. > $ 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. No problem here. The machine isn't being unresponsive. > $ 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. I can't reproduce this. System works fine for me. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into Xen guests. http://et.redhat.com/~rjones/virt-p2v -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
