Christopher, et al.,
I am trying to get my head around why the performance of ramdisk is so
much poorer than that of HDD-pool+SSD-slog.
/usbkey/test_dir]# time dd if=/dev/zero of=/tmpfs/testfile bs=64k
count=32768;time dd if=/dev/zero of=/usbkey/test_dir/testfile bs=64k
count=32768
32768+0 records in
32768+0 records out
2147483648 bytes transferred in 2.279053 secs (942270169 bytes/sec)
real 0m2.312s
user 0m0.021s
sys 0m1.062s
32768+0 records in
32768+0 records out
2147483648 bytes transferred in 0.743729 secs (2887453957 bytes/sec)
real 0m0.760s
user 0m0.016s
sys 0m0.652s
I created the ramdisk thus:
ramdiskadm -a rd1 3072m
...
zfs create -o mountpoint=/tmpfs -o sync=disabled ramdsk1/rd1
I've run it many times and although the results vary yet the tale is
always the same.
Thank You,
Will
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