Date: Tue, 30 Oct 2007 00:16:25 +0300 From: "Oleg Derevenetz" <oleg@vsi.ru> To: "Dmitry Morozovsky" <marck@rinet.ru> Cc: stable@freebsd.org Subject: Re: rrdtool performance tuning (fwd) Message-ID: <004b01c81a70$f9fcc210$eec55358@OODAMDXP> References: <20071029111235.E69594@woozle.rinet.ru>
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> [hmm, after thinking a bit I decided it would be more appropriate here, in > stable@] > > Dear colleagues, > > any hints to tune rrdtool with ~30k rrd files (approx 2k target devices)? > > machine is mostly IO-bound, showing 100% disk load with 8 or sometimes > even 3 > mB/s, 300-400 tps (it's 2 SATA300 disks in gmirror) For example, update algorythm can be changed. Try to not update RRD files simultaneously, queue update data instead (with timestamps), for example, in memory, and periodically do a "bulk update" using a single rrdupdate call for all queue items related to single RRD file. This saves I/O a lot, for example, in my NMS (TclMon) I use simular scheme, and now it updates >50K RRD files with 5-10 variables each. I/O load is 100-150 tps with 1-1.5MB/s throughput. -- Oleg Derevenetz <oleg@vsi.ru> OOD3-RIPE Phone: +7 4732 539880 Fax: +7 4732 531415 http://www.vsi.ru CenterTelecom Voronezh ISP http://isp.vsi.ru
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