Date: Mon, 26 Feb 96 18:16:25 MET From: Greg Lehey <lehey.pad@sni.de> To: bde@zeta.org.au (Bruce Evans) Cc: hackers@freebsd.org (Hackers; FreeBSD) Subject: Re: Disk perf. with different HDs/Adapt. Message-ID: <199602261719.SAA01522@nixpbe.pdb.sni.de> In-Reply-To: <199602240722.SAA23535@godzilla.zeta.org.au>; from "Bruce Evans" at Feb 24, 96 6:22 pm
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>> Those 1.92 seconds make for exactly 6826667 Bytes per second ... >> And the 7.43 give some 6962656 Bytes/s. > >> (Yes, I know, the results aren't exact to more than 2 decimals >> due to the limited time resolution ...) > > Someone should fix dd to use the available resolution of 4-6 decimal > places. I suppose the output of `time' is too standard to change. How about a high-resolution option. For example, # time dd if=/dev/rsd0a of=/dev/null count=200 bs=64k 13107200 bytes transferred in 2 secs (6553600 bytes/sec) 1.92 real 0.01 user 0.05 sys # time -h dd if=/dev/rsd0a of=/dev/null count=200 bs=64k 13107200 bytes transferred in 2 secs (6553600 bytes/sec) 1.920317 real 0.009387 user 0.0512614 sys Greg
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