-----Original Message----- From: Jeremy Chadwick <free...@jdc.parodius.com> To: Jesse Smith <jessefrgsm...@yahoo.ca> Cc: freebsd-ports <freebsd-ports@FreeBSD.org> Subject: Re: Converting from jiffies to ticks Date: Thu, 19 Aug 2010 12:26:45 -0700
On Thu, Aug 19, 2010 at 04:15:39PM -0300, Jesse Smith wrote: > I am currently trying to port a program from Linux to FreeBSD which > detects how much processor time a process is using. The native Linux > code does this (in part) by reading the number of "jiffies" a given > process uses. This info is pulled from the /proc/PID/stat file. > > One function is failing on FreeBSD and it's obviously because FreeBSD > does not have all the same files/data in the /proc directory. > > I've looked around and, as I understand it, FreeBSD uses "ticks" instead > of "jiffies" to measure process usage. However, how to gather that data > is a bit lost on me. > > This raises two questions for me: > 1. Where can I find the equivalent information on FreeBSD? I assume > there's a function call. Maybe in the kvm_* family? I need to be able to > get the number of ticks a given PID is using. > > 2. Any idea on what the conversion rate between ticks and jiffies is? > Are they the same thing, but with different names? Or is it a kilometres > and miles issue? > > > The rest of the program measures everything in "jiffies", so it would be > ideal for me to get the ticks used on FreeBSD (based on PID), convert it > to "jiffies" and pass it back to the main program. I would recommend you re-ask this question on freebsd-hackers. freebsd-ports isn't really for this purpose. Thanks Jeremy, I'll check out the freebsd-hackers list. Chuck, I read the manual entry for acct(2) and acct(5) and it's close to what I want. But the acct functions appear to just handle stats on processes that have terminated. I'm trying to get cpu usagbe while they're still alive. Appreciate the pointers, Jesse _______________________________________________ freebsd-ports@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-ports To unsubscribe, send any mail to "freebsd-ports-unsubscr...@freebsd.org"
