Date: Fri, 22 Dec 2000 19:56:23 -0600 From: Dan Nelson <dnelson@emsphone.com> To: Greg Lehey <grog@lemis.com> Cc: Lauri Laupmaa <mauri@inspiral.net>, questions@FreeBSD.ORG Subject: Re: sar for FreeBSD Message-ID: <20001222195623.A27587@dan.emsphone.com> In-Reply-To: <20001223105657.A64696@wantadilla.lemis.com>; from "Greg Lehey" on Sat Dec 23 10:56:57 GMT 2000 References: <3A4302A7.7A31846C@inspiral.net> <20001222111954.B13745@dan.emsphone.com> <20001223105657.A64696@wantadilla.lemis.com>
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In the last episode (Dec 23), Greg Lehey said: > On Friday, 22 December 2000 at 11:19:54 -0600, Dan Nelson wrote: > > SCO released the source to their sar program to a company called > > Starnix in June '99. Nothing has happened since then, and the > > source is apparently still not freely available. > > I investigated this code last year. There would have been no problem > in getting the code. The real issue is that it would have required a > large amount of kernel code changes, and we weren't really sure that > it would give us so much more than sa as to make it worthwhile. Take > a look at sa(8) and see if you disagree. But sar and sa really don't record the same info. sa tracks individual processes, where sar looks at the system as a whole and gives you averages over 20-minute periods. "-c" prints syscalls/sec, plus separate breakdowns for read, write, fork and exec. "-d" prints disk I/O stats broken down per disk (per partition on Solaris). "-w" prints blocks swapped in/out per second, which is good for determining if you're low on RAM, even when the RAM-hungry application runs at night when you're asleep. You could even whip up a partial version of "sar" with the output of vmstat -s, and by beefing up what gets tracked, you could measure almost all of what SCO/Solaris sar tracks. -- Dan Nelson dnelson@emsphone.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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