Generally it is much better to create a ramdisk for this benchmark:
# mount -t tmpfs -o size=10G tmpfs /tmp/ramdisk;
or
# dd if=/dev/zero of=/dev/ram bs=1M count=10000; # mkfs.ext3 /dev/ram; # mount /dev/ram /tmp/ramdisk -o loop;

Normally your harddisk is to slow …

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