On Mon, 25 Mar 2013, Sašo Kiselkov wrote:
In fact, ramdisks may have other pathologies that may make them unusable as a tool for testing VM performance. Here's what I got when I created a zpool on my dual-Opteron machine on a ramdisk: dd if=/dev/zero of=/test/ttt bs=1M count=700 700+0 records in 700+0 records out 734003200 bytes (734 MB) copied, 2.42307 s, 303 MB/s And yet this machine can manage several GB/s in a simple memcpy test. Clearly, some other performance measurement approaches might be needed.
Since the claim was that the memory was slow (possible, especially if there are ECC errors) the classic STREAM benchmark would be a useful test:
http://www.cs.virginia.edu/stream/ Bob -- Bob Friesenhahn [email protected], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
