Messages in this thread | | | Date | Fri, 24 Jan 2003 11:07:27 -0700 | From | Andreas Dilger <> | Subject | Re: buffer leakage in kernel? |
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On Jan 24, 2003 13:49 +0100, Roman Dementiev wrote: > I've met with following problem (kernel 2.4.20-pre4 ): > I write and read sequentially from/to 8 files each of 64 Gbytes (not a > mistake, 64 Gbyte), > each on different disk. The files are opened with flag O_DIRECT. I have > 1 Gbyte RAM, no swap. > While this scanning is running, number of "buffers" reported by ''free" > and in /proc/meminfo > is continuously increasing up to ~ 500 MB !! When the program exits > normally or I break it, number > of "buffers" does not decrease and even increases if I do operations on > other files. > > This is not nice at all when I have another applications running > with memory consumption > 500 MB: when my "scanner" approaches 50G > border on each disk, I've got numerous "Out of memory" murders :(. > Even 'ssh' to this machine is killed :(
There was a bug in vanilla 2.4.18 related to O_DIRECT that is fixed in the RH kernel, but I don't know when/if it was merged into the main kernel. As always, testing with the most recent kernel (2.4.21-pre3 currently) will tell you whether that bug has been fixed already or not.
Cheers, Andreas -- Andreas Dilger http://sourceforge.net/projects/ext2resize/ http://www-mddsp.enel.ucalgary.ca/People/adilger/
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