Today Florian Forster wrote: > Hi Lily, > > On Sun, Mar 15, 2009 at 10:39:37AM +0800, lily wrote: > > How can I keep the data in memory? Use the mmap ? Is upgrade the > > version to 1.3.6 wil be OK or I have to something in my code ? > > basically, all you have to do is have more memory - the operating system > should do the rest.. > > > My rrdtool is the 1.2.27, I don't know if I upgrade my version to > > 1.3.6, Is there some *compatibility *problem ? > > Version 1.3 introduces a changed file format. It can still work with RRD > files created by version 1.2, but not the other way around.
Note this changed format is only active when you create a particular type of holt-winters RRAs. In general the same format as in 1.2 gets created. > > > > You did mount with `noatime' and `nodiratime', right? While this doesn't > > > > perform miracles, it'll certainly increase performance some percent.. > > > > Yes , I did not do that . But if I do that , I don't have the access > > time , rigth ? > > Uhm, yes.. That's why it's called `NOatime'.. What do you need the > `atime' for? Are you sure you don't confuse this with the `mtime'? > > I've heard of a system which relied on `atime' to clean up dynamically > created files (they were using the file system as some kind of cache, > really). When IO killed that system, they started deleting files a fixed > time after they were created (possibly recreating busy items/files), > which improved performance A LOT. > > > Now I reduce the number of the file from 12K to 8K , I have not > > encountered the problem yet. So I think the reason is the high load . > > I guess that your 12k files just do not fit into your 4 GBytes of RAM > and those 8k files to. I'd interpret this observation as indication that > more RAM is the easiest way out of your performance problems. > > Regards, > -octo cheers tobi > -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch t...@oetiker.ch ++41 62 775 9902 / sb: -9900 _______________________________________________ rrd-developers mailing list rrd-developers@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-developers
