Date: Fri, 14 Sep 2012 08:36:48 +0530 From: Sriram Gorti <gsriram@gmail.com> To: =?ISO-8859-1?Q?Micka=EBl_Can=E9vet?= <canevet@embl.fr> Cc: freebsd-questions@freebsd.org Subject: Re: Swapped memory limited to about 500MB for a process ? Message-ID: <CAF_V1q4u=UNdMmcfYicKg%2BzGxn006f2Z%2BvOsyVBXfGUxQL5xEQ@mail.gmail.com> In-Reply-To: <1347458607.4141.88.camel@pc437.embl.fr> References: <1347268974.4141.65.camel@pc437.embl.fr> <44k3w0ij6n.fsf@be-well.ilk.org> <1347432178.4141.82.camel@pc437.embl.fr> <44y5kfgwxi.fsf@be-well.ilk.org> <1347458607.4141.88.camel@pc437.embl.fr>
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On Wed, Sep 12, 2012 at 7:33 PM, Micka=EBl Can=E9vet <canevet@embl.fr> wrot= e: > On Wed, 2012-09-12 at 10:03 -0400, Lowell Gilbert wrote: >> Micka=EBl Can=E9vet <canevet@embl.fr> writes: >> >> > On Tue, 2012-09-11 at 13:05 -0400, Lowell Gilbert wrote: >> >> Micka=EBl Can=E9vet <canevet@embl.fr> writes: >> >> >> >> > I was impacted by a memory leak that has been fixed by this patch: >> >> > http://people.freebsd.org/~rmacklem/namei-leak.patch >> >> > >> >> > What I noticed when the server was paging is that it seems that onl= y >> >> > about 500MB of my 4GB swap partition was used before crashing. I wa= s >> >> > wondering why it didn't take the whole 4GB up to the crash of the s= erver >> >> > because of lake of memory (that would let me more time to react). >> >> > >> >> > Is there such king of setting that prevent a process to put more th= en >> >> > 500MB of data in swap ? >> >> >> >> limits(1)? >> >> >> > Thank you for your answer. >> > >> > Here is the result of limits: >> > >> > limits >> > Resource limits (current): >> > cputime infinity secs >> > filesize infinity kB >> > datasize 33554432 kB >> > stacksize 524288 kB >> > coredumpsize infinity kB >> > memoryuse infinity kB >> > memorylocked infinity kB >> > maxprocesses 5547 >> > openfiles 11095 >> > sbsize infinity bytes >> > vmemoryuse infinity kB >> > pseudo-terminals infinity >> > swapuse infinity kB >> > >> > swapuse is set to unlimited, but stacksize is set to 512MB. >> > Is it the stacksize setting that prevent my kernel to swap more then >> > 512MB ? >> >> No, I don't think so. datasize was the parameter I was most >> suspecting; and it assumes that a particular process was causing the >> crash (which is unlikely; the OS is supposed to protect you against >> it). >> >> Most likely, the crash was not directly caused by a shortage of virtual >> memory. You would have to diagnose through crash dumps, but it could be >> that some more specific resource was exhausted. Or perhaps the memory >> leak left dangling references in a vnode. >> We also had a some what similar experience - swap partition was not being fully utilized (but no NFS in use). Found that the size of SWAPMETA limits the total usable swap space. This is more likely with a custom config and tweaked limits. vmstat -z | egrep "LIMIT|SWAPMETA" --- sriram > > OK, > > Thanks a lot for your explanations. > > Cheers, > Micka=EBl
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