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. > > > 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 -- Florian octo Forster Hacker in training GnuPG: 0x91523C3D http://verplant.org/
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