paul@phoenix.Princeton.EDU (Paul Lansky) (02/28/91)
We just got a NextStation with a 400 meg hard drive, and I did a quick test of the raw disk speed. This disk is really hot! ramirez> temp/ ls -l total 18616 -rw-r--r-- 1 paul 19038208 Feb 27 09:10 piano1.snd ramirez> temp/ time dd if=piano1.snd of=/dev/null bs=32768 581+0 records in 581+0 records out 0.0u 9.0s 0:17 53% 0+0k 2332+0io 0pf+0w ramirez> temp/ bc -l 19038208/17 1119894.58823529411764705882 That comes to a transfer rate of over 1.1 meg a second. This is *much* faster than the other disks NeXT has been using. Just thought you'd like to know. Paul Lansky Music Princeton paul@princeton.edu
louie@sayshell.umd.edu (Louis A. Mamakos) (03/01/91)
In article <6708@idunno.Princeton.EDU> paul@phoenix.Princeton.EDU (Paul Lansky) writes: >We just got a NextStation with a 400 meg hard drive, and I did >ramirez> temp/ time dd if=piano1.snd of=/dev/null bs=32768 >581+0 records in >581+0 records out >0.0u 9.0s 0:17 53% 0+0k 2332+0io 0pf+0w How much of this file was already lying about in kernel buffers? I don't think that you are only measuring disk performance, but also the effect of Mach's VM and file mapping. For those of you running MH: do a 'scan' of a folder and note how long it takes. Do another scan, and notice that it runs MUCH faster than before.. louie