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