* Dmitry Morozovsky <[EMAIL PROTECTED]> [071030 02:30] wrote: > On Mon, 29 Oct 2007, Alfred Perlstein wrote: > > AP> * Dmitry Morozovsky <[EMAIL PROTECTED]> [071029 12:44] wrote: > AP> > > AP> > [hmm, after thinking a bit I decided it would be more appropriate here, > in > AP> > [EMAIL PROTECTED] > AP> > > AP> > Dear colleagues, > AP> > > AP> > any hints to tune rrdtool with ~30k rrd files (approx 2k target > devices)? > AP> > > AP> > machine is mostly IO-bound, showing 100% disk load with 8 or sometimes > even 3 > AP> > mB/s, 300-400 tps (it's 2 SATA300 disks in gmirror) > AP> > AP> More ram? > > Already 2G, mostly inactive/free. > > AP> > AP> Turn off atime? > > For sure, and even tried to move rrd data to smaller UFS2 - same result. > > AP> Hash the data files into multiple directories to avoid having 2k files > AP> in one dir. > > Hmm, I thought 2k is not so much, especially where UFSDIRHASH is in place... > > AP> Not sure how rrd tool works internally, but it might make sense > AP> to see if you can use some layering library to force it to cache > AP> some open files per process or something. > > It seems it using a lot of mmap...
My try hacking the code and adding MAP_NOSYNC to the call to mmap(2). Try hacking the code to keep the file mapped instead of open/closing it on each access. -Alfred _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
