On Tuesday 19 December 2006 22:05, Mark Kirkwood wrote: > In the process of investigating performance in another area I happened > to be measuring sequential cached reads (in a fairly basic manner): > > $ dd if=/dev/zero of=/tmp/file bs=8k count=100000 # create file > 819200000 bytes transferred in 4.849394 secs (168928321 bytes/sec) > > $ dd of=/dev/null if=/tmp/file bs=8k # read it > 819200000 bytes transferred in 2.177922 secs (376138354 bytes/sec) > $ dd of=/dev/null if=/tmp/file bs=8k # read again > 819200000 bytes transferred in 2.178407 secs (376054620 bytes/sec) > $ dd of=/dev/null if=/tmp/file bs=32k # read it > 819200000 bytes transferred in 1.801944 secs (454620117 bytes/sec) >
hum, look my releng_6: # dd of=/dev/null if=/c/c1/file bs=8k 100000+0 records in 100000+0 records out 819200000 bytes transferred in 1.017492 secs (805116851 bytes/sec) # dd of=/dev/null if=/c/c1/file bs=8k 100000+0 records in 100000+0 records out 819200000 bytes transferred in 1.015790 secs (806465915 bytes/sec) # dd of=/dev/null if=/c/c1/file bs=32k 25000+0 records in 25000+0 records out 819200000 bytes transferred in 0.896507 secs (913768635 bytes/sec) -- João A mensagem foi scaneada pelo sistema de e-mail e pode ser considerada segura. Service fornecido pelo Datacenter Matik https://datacenter.matik.com.br _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
