On April 18, 2018 8:23:12 AM CDT, Jamon Camisso via talk <talk@gtalug.org> wrote:
On 2018-04-18 07:35 AM, Russell via talk wrote:
On April 17, 2018 9:02:14 AM CDT, lsorense@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.
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
One 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
Thanks, I downloaded it and man bonnie++ is my transit read today.
--- Talk Mailing List talk@gtalug.org https://gtalug.org/mailman/listinfo/talk
-- Russell