On 2018-04-18 07:35 AM, Russell via talk wrote: > > > On April 17, 2018 9:02:14 AM CDT, lsore...@csclub.uwaterloo.ca wrote: >> On Tue, Apr 17, 2018 at 08:20:47AM -0400, Russell via talk wrote: >>> Currently I have two versions of the same os on the same machine. One >> on M.2 Xpoint nvram and one on a standard SSD. I'm playing around with >> tweaking before I do a final config. So far the Xpoint direct hw access >> appears 3x as fast as the SSD while real world throughput shows up >> about twice as fast on the Xpoint, recent INTEL cache fencing >> notwithstanding. >>> >>> dd if=/dev/zero bs=1M count=1024 | md5sum >>> 1024+0 records in >>> 1024+0 records out >>> 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 1.35008 s, 795 MB/s >>> cd573cfaace07e7949bc0c46028904ff - >>> >>> 795 is just under twice as fast as writing to the conventional SSD. >> >> That command didn't write anything to anywhere. > > It wrote a bunch of zeros to a virtual file. Perhaps even touching a tmp file > along the way. Even if it didnt touch tmp, it wrote the zeros someplace in > order to perform the count. > > I was just trying to comment on the speeds of the two installs relative to > the respective disks the OS runs from. I'm sorry you didn't understand that. > Perhaps I should have said running the OS from the two different drives, > irrespective of all the other disk writes which may happen when the OS > operates normally when calling dd from a GUI.
Try bonnie++ a few times on each install. It is explicitly designed to test drive performance. Cheers, Jamon --- Talk Mailing List talk@gtalug.org https://gtalug.org/mailman/listinfo/talk