Date: Sat, 9 Apr 2011 12:06:41 -0700 From: Artem Belevich <art@freebsd.org> To: Joe Schaefer <joesuf4@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: imposing memory limits in FreeBSD 8 Message-ID: <BANLkTimUbqen3cBVrK_DD_FA8jSKgM8pdA@mail.gmail.com> In-Reply-To: <BANLkTikttrxFR-Xa7TqGXFgipKxavioJWQ@mail.gmail.com> References: <BANLkTikttrxFR-Xa7TqGXFgipKxavioJWQ@mail.gmail.com>
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On Sat, Apr 9, 2011 at 10:15 AM, Joe Schaefer <joesuf4@gmail.com> wrote: > While I am thrilled about the newfound zfs stability that upgrading to 8 > has brought, one of the things that seems to have been dropped is > support for process memory limits. I have a few servers that occasionally > run out of swap due to runaway httpd daemons, and the ulimit -m settings > in the startup scripts we use stopped working upon upgrading from FreeBSD 6. > > I've tried fiddling with the daemon class in login.conf to no avail > either. About > the only thing I haven't tried is running httpd under djb's softlimit > executable. > Here's my daemon class in login.conf: > > daemon:\ > :memoryuse=1g:\ > :datasize=1g:\ > :stacksize=1g:\ > :tc=default: > > and proof that `limits` groks the config: > > # limits -eHC daemon > ulimit -t unlimited; > ulimit -f unlimited; > ulimit -d 1048576; > ulimit -s 1048576; > ulimit -c unlimited; > ulimit -m 1048576; > ulimit -l unlimited; > ulimit -u unlimited; > ulimit -n unlimited; > ulimit -b unlimited; > ulimit -v unlimited; > ulimit -p unlimited; > ulimit -w unlimited; > > Any tips from admins who have successfully imposed memory constraints in 8.x? If I recall it correctly, in -8 malloc defaults to mmap for memory allocations, so RLIMIT_DATA no longer applies. You have to set RLIMIT_VMEM, but be careful as that would include everything mmapped in even if it does not use much of that. rpc.statd is one example of that -- it mmaps in ~256M but has only ~400K resident set size. Another option would be to make malloc() switch back to sbrk() with MALLOC_OPTIONS=D. This way datasize limit will still be in effect. --Artem
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