Re: recommendation for swap space?
Sacha, try to modify the /proc/sys/vm/swappiness it's on 60 (default), I reduce it to 20 or even 0, on my oracle cluster, to prevent important process from being swapped. Regards, Pablo On Tue, Apr 8, 2008 at 5:51 AM, Sascha Ottolski <[EMAIL PROTECTED]> wrote: > Am Montag 07 April 2008 18:00:14 schrieb Dag-Erling Smørgrav: > > > Sascha Ottolski <[EMAIL PROTECTED]> writes: > > > now that my varnish processes start to reach the RAM size, I'm > > > wondering what a dimension of swap would be wise? I currently have > > > about 30 GB swap space for 32 GB RAM, but am wondering if it could > > > even make sense to have no swap at all? My cache file is 517 GB in > > > size. > > > > Varnish does not use swap. > > > > DES > > hmm, then I'm wondering why my machines do swap quite a bit. It's a > almost naked linux, the only processes really doing some work are > varnishd and varnishlog. > > I have 32 GB of RAM, 30 GB of swap, and 517 GB of cache file. according > to "top", varnishd has a resident size of 25 GB, and almost 1,5 GB of > swap is in use. kswapd often shows up in "top". > > > # free > total used free sharedbuffers cached > Mem: 32969244 32874908 94336 0 108648 29129752 > -/+ buffers/cache:3636508 29332736 > Swap: 290454801473200 27572280 > > > it's not worrying me, performance is brilliant, I'm just curious :-) > > > Thanks, Sascha > > > ___ > varnish-misc mailing list > varnish-misc@projects.linpro.no > http://projects.linpro.no/mailman/listinfo/varnish-misc > ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
Am Montag 07 April 2008 18:00:14 schrieb Dag-Erling Smørgrav: > Sascha Ottolski <[EMAIL PROTECTED]> writes: > > now that my varnish processes start to reach the RAM size, I'm > > wondering what a dimension of swap would be wise? I currently have > > about 30 GB swap space for 32 GB RAM, but am wondering if it could > > even make sense to have no swap at all? My cache file is 517 GB in > > size. > > Varnish does not use swap. > > DES hmm, then I'm wondering why my machines do swap quite a bit. It's a almost naked linux, the only processes really doing some work are varnishd and varnishlog. I have 32 GB of RAM, 30 GB of swap, and 517 GB of cache file. according to "top", varnishd has a resident size of 25 GB, and almost 1,5 GB of swap is in use. kswapd often shows up in "top". # free total used free sharedbuffers cached Mem: 32969244 32874908 94336 0 108648 29129752 -/+ buffers/cache:3636508 29332736 Swap: 290454801473200 27572280 it's not worrying me, performance is brilliant, I'm just curious :-) Thanks, Sascha ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
On Mon, Apr 7, 2008 at 6:18 PM, Michael S. Fischer <[EMAIL PROTECTED]> wrote: > > > now that my varnish processes start to reach the RAM size, I'm wondering > > > what a dimension of swap would be wise? I currently have about 30 GB > > > swap space for 32 GB RAM, but am wondering if it could even make sense > > > to have no swap at all? My cache file is 517 GB in size. > > > > Varnish does not use swap. > > That said, it wouldn't make sense to entirely deallocate your swap > space, since the kernel may decide to page or swap out processes other > than Varnish. You also need swap if a huge process tries to fork. Having a huge Process forking a child, means, that the child process initially is a copy of the parent. It is a copy on write memory (so it doesn't realy use memory) and in most cases the child will release all memory and do something else, but the virtual memory needs to be big enough during the fork. Greetings Christoph ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
On Mon, 7 Apr 2008, Michael S. Fischer wrote: > On Mon, Apr 7, 2008 at 2:14 PM, Simon Lyall <[EMAIL PROTECTED]> wrote: > > On Mon, 7 Apr 2008, Michael S. Fischer wrote: > > > That said, it wouldn't make sense to entirely deallocate your swap > > > space, since the kernel may decide to page or swap out processes other > > > than Varnish. > > > > and what is wrong with that? Surely your RAM is better being used by the > > main applications on the server ( Varnish ) rather than "sitting around > > and waiting" copies of sshd, cron and getty? > > Huh? Nothing I said contradicts that. Sorry, I read " wouldn't " as " would " [1] . [1] Approx 7 times. -- Simon J. Lyall | Very Busy | Web: http://www.darkmere.gen.nz/ "To stay awake all night adds a day to your life" - Stilgar | eMT. ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
On Mon, Apr 7, 2008 at 2:14 PM, Simon Lyall <[EMAIL PROTECTED]> wrote: > On Mon, 7 Apr 2008, Michael S. Fischer wrote: > > That said, it wouldn't make sense to entirely deallocate your swap > > space, since the kernel may decide to page or swap out processes other > > than Varnish. > > and what is wrong with that? Surely your RAM is better being used by the > main applications on the server ( Varnish ) rather than "sitting around > and waiting" copies of sshd, cron and getty? Huh? Nothing I said contradicts that. --Michael ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
On Mon, 7 Apr 2008, Michael S. Fischer wrote: > That said, it wouldn't make sense to entirely deallocate your swap > space, since the kernel may decide to page or swap out processes other > than Varnish. and what is wrong with that? Surely your RAM is better being used by the main applications on the server ( Varnish ) rather than "sitting around and waiting" copies of sshd, cron and getty? -- Simon J. Lyall | Very Busy | Web: http://www.darkmere.gen.nz/ "To stay awake all night adds a day to your life" - Stilgar | eMT. ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
On Mon, Apr 7, 2008 at 9:00 AM, Dag-Erling Smørgrav <[EMAIL PROTECTED]> wrote: > Sascha Ottolski <[EMAIL PROTECTED]> writes: > > now that my varnish processes start to reach the RAM size, I'm wondering > > what a dimension of swap would be wise? I currently have about 30 GB > > swap space for 32 GB RAM, but am wondering if it could even make sense > > to have no swap at all? My cache file is 517 GB in size. > > Varnish does not use swap. That said, it wouldn't make sense to entirely deallocate your swap space, since the kernel may decide to page or swap out processes other than Varnish. --Michael ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
Sascha Ottolski <[EMAIL PROTECTED]> writes: > now that my varnish processes start to reach the RAM size, I'm wondering > what a dimension of swap would be wise? I currently have about 30 GB > swap space for 32 GB RAM, but am wondering if it could even make sense > to have no swap at all? My cache file is 517 GB in size. Varnish does not use swap. DES -- Dag-Erling Smørgrav Senior Software Developer Linpro AS - www.linpro.no ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
