On Tue, Feb 02 2010, Bart Van Assche wrote: > Hello Jens, > > I noticed that writing with fio to /dev/null takes much more time (220 > times more for the test below) than with dd. Did I specify the correct > arguments to fio ? If so, is this known behavior of fio ? > > $ dd if=/dev/zero of=/dev/null bs=1M count=1024 > 1024+0 records in > 1024+0 records out > 1073741824 bytes (1.1 GB) copied, 0.121485 s, 8.8 GB/s > > $ fio --bs=1M --size=1G --buffered=1 --rw=write --verify=0 > --name=dev-null /dev/null You are writing to a file named dev-null and /dev/null is being ignored as an argument. You want a --filename=/dev/null at the end instead. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
