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 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
