On Sun, Jul 3, 2011 at 3:14 AM, leif <[email protected]> wrote: > On Jul 2, 8:03 pm, William Stein <[email protected]> wrote: >> On Sat, Jul 2, 2011 at 7:46 AM, Jason Grout <[email protected]> >> wrote: >> > I've been doing some experiments with the python resource module and the >> > setrlimit command to set resource limits on processes. I've found >> > something >> > very interesting: it seems that on OSX (10.6.8), there is no way to have a >> > hard cap on the amount of memory a process uses, at least no way that I can >> > find. >> >> Wow, this is really disturbing. >> Thanks for letting us know about this. >> I tried using "ulimit -v" from bash in OS X, and it also doesn't seem >> to do anything at all. >> Scary. > > Indeed. > > See also > > http://stackoverflow.com/questions/3274385/how-to-limit-memory-of-a-os-x-program-ulimit-v-neither-m-are-working >
One answer there *does* claim to give a working solution to the problem of this thread, but using launchd instead of setrlimit. That's encouraging. > and > > http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man5/launchd.plist.5.html > > ('Data' key in 'HardResourceLimits'). > > As I have no MacOS X boxes, I can't tell if this works. > > > -leif > > > >> > The RLIMIT_AS category for resource limits on OSX is an alias for >> > RLIMIT_RSS (see /usr/include/system/resources.h, and note that RLIMIT_AS >> > does not appear in the setrlimit manpage). However, on Linux (at least the >> > linux running on boxen), RLIMIT_AS *does* seem to put a hard cap on the >> > amount of memory a process can use, and the process fails if it tries to >> > use >> > more memory than that. >> >> > So, the takeaway: be careful when running public sage notebook servers on >> > OSX, since you can't specify a maximum memory hard cap for a process. >> >> > On the other hand, maybe I'm misunderstanding something. Does anyone know >> > how to set a hard memory cap on OSX? >> >> > Thanks, >> >> > Jason > > -- > To post to this group, send an email to [email protected] > To unsubscribe from this group, send an email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org > -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send an email to [email protected] To unsubscribe from this group, send an email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
