Date: Sat, 5 Mar 2005 17:15:11 +0000 From: Phil Brennan <phil.brennan@gmail.com> To: Vlad <marchenko@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: performance under heavy load Message-ID: <ff0f76e0050305091561d3e893@mail.gmail.com> In-Reply-To: <cd70c68105030508583168a727@mail.gmail.com> References: <ff0f76e00503050828481e6462@mail.gmail.com> <cd70c68105030508583168a727@mail.gmail.com>
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True, on that linux machine its more io load than anything else. But anyway, the problem was caused by fortune -l going into an infinite loop, and a script running this every 5 minutes. On Sat, 5 Mar 2005 11:58:08 -0500, Vlad <marchenko@gmail.com> wrote: > > On a highly linux machine, you lose all control of the machine past a load of about 6 - 10. > > to be fair, I should note that as admin / user of few tens of servers > running both systems, I can assure you that if your linux "loses > control" with LA ~ 10, then something is seriously wrong with that > server and it's not because of the linux (rather it's hardware or > wrong kernel configuration). I had cases of LA climbing over 150 on > linux machine - it was extremely slow but I could get it back to life > w/o need for reboot. > > On Sat, 5 Mar 2005 16:28:09 +0000, Phil Brennan <phil.brennan@gmail.com> wrote: > > Hi, I'd just like to give some credit to the freebsd developers for a > > job well done. > > A user on our system ( freebsd 5.2.1 smp ) managed with a runaway > > script to start up 500 intensive processes, raising the load average > > to about 200. > > We managed to remotely, over ssh get a somewhat responsive session and > > kill the offending processes. Yes, I know we shouldn't have let it > > happen in the first place, by putting in proper user limits and all > > that, but it was amazing that the machine still worked. We thought > > we'd have to reboot. Even with a load of nearly 200, the machine was > > still able to serve web pages :) > > Once the load came down past 60, the system feltl fully responsive again. > > On linux, we would have had to reboot in this situation. On a highly > > linux machine, you lose all control of the machine past a load of > > about 6 - 10. This just further vindicates my decision to use freebsd > > for this service. ( Its a shell server with about 100 active users, > > apache, nfs, mysql, ldap ). Just wanted to share a success story :) > > Regards, > > > > Philip Brennan > > _______________________________________________ > > freebsd-stable@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" > > > > -- > Vlad >
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