Date: Tue, 30 Oct 2007 12:30:37 +0300 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: Alfred Perlstein <alfred@freebsd.org> Cc: stable@freebsd.org Subject: Re: rrdtool performance tuning (fwd) Message-ID: <20071030122816.U39332@woozle.rinet.ru> In-Reply-To: <20071029232403.GE33488@elvis.mu.org> References: <20071029111235.E69594@woozle.rinet.ru> <20071029232403.GE33488@elvis.mu.org>
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On Mon, 29 Oct 2007, Alfred Perlstein wrote: AP> * Dmitry Morozovsky <marck@rinet.ru> [071029 12:44] wrote: AP> > AP> > [hmm, after thinking a bit I decided it would be more appropriate here, in AP> > stable@] 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... Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] [ FreeBSD committer: marck@FreeBSD.org ] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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