On 8/26/07, Fred Tyler <[email protected]> wrote:
> On 8/26/07, Jan Engelhardt <[email protected]> wrote:
> >
> > On Aug 26 2007 11:51, Fred Tyler wrote:
> > >On 8/26/07, Fred Tyler <[email protected]> wrote:
> > >> I think I've come across a memory leak in 2.6.20. I've upgraded to the
> > >> latest 2.6.20.17, but it didn't seem to help.
> > >
> > >Sorry to keep replying to my own post, but further investigation
> > >suggests that the memory losses may be occurring at times of heavy
> > >filesystem access. The machines in question run rsyncs of hundreds of
> > >thousands of files every few hours, and I'm starting to think that the
> > >memory loss occurs during these times. I don't know how I'd go about
> > >proving this though...
> >
> > Please rule out filesystem caches by issuing
> > sync;
> > echo 3 >/proc/sys/vm/drop_caches;
>
>
> Ok, I did this on a non-production machine that has only been up for a
> few hours, and here's what happened:
>
> ======== Before =========
>
> $ free -m
> total used free shared buffers cached
> Mem: 878 824 54 0 111 422
> -/+ buffers/cache: 290 587
> Swap: 63 0 63
>
>
> ======== After ========
>
> root@b0$ free -m
> total used free shared buffers cached
> Mem: 878 47 830 0 6 4
> -/+ buffers/cache: 36 841
> Swap: 63 0 63
>
> ======================
>
> So, I guess it worked? (I don't know what was supposed to happen, but
> memory usage dropped significantly when I did this.)
>
> However, I'm not sure this staging machine has been up long enough or
> doing enough to exhibit the problem. I can try this on my production
> servers (the ones I provided graphs for) late tonight, but how safe is
> running this command? Does it permanently disable file caching? Do I
> need to reset it afterwards? If I stop all services (databases,
> logging, etc) first, am I protected against data loss?
>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
