Re: High disk IO

On Wednesday 11 May 2011 02:31:51 Dennis Nezic wrote:
> On Fri, 6 May 2011 15:55:59 -0400, Dennis Nezic wrote:
> > On Fri, 6 May 2011 18:57:13 +0100, Matthew Toseland wrote:
> > > On Thursday 05 May 2011 03:26:45 Dennis Nezic wrote:
> > > > For the past several builds, I'm not sure exactly when the issue
> > > > started, before build01364 at least, my node experiences quite
> > > > high disk IO, which bogs down my computer. I think once I left it
> > > > alone, and it resolved itself after a few hours, but usually I
> > > > have to restart Freenet to make my server more useable.
> > > > 
> > > > My "vmstat 5" reports bi (bytes-in, that is: reading) between
> > > > 4000-10000. (Under 100 after I stop Freenet.)
> > > > 
> > > > My graphs[1] show it to be suspiciously periodic, although that
> > > > might just be a coincidence.
> > > > 
> > > > Is there some kind of background (periodic) database/datastore
> > > > task that might be causing this? My wrapper.log shows no output
> > > > during these events, nor does fproxy say that anything is going
> > > > on.
> > > 
> > > Active downloads/uploads?
> > 
> > Yep ... a few active downloads -- about 30MBs each. (One got completed
> > much earlier in the day -- but nothing unusual was happening during
> > the problem peaks.) It happened again last night [2][3], suspiciously
> > almost exactly 24 hours after the last time. I didn't stop my node
> > this time, and it "fixed" itself (at least the plateau) after over 2
> > hours, although disk IO was still quite high throughout the night [2]
> > and early morning.
> > > > 
> > > > [1]
> > > > http://dennisn.dyndns.org/guest/pubstuff/freenet-periodic-high-io.jpg
> > [2] That's what she said.
> > [3]
> > http://dennisn.dyndns.org/guest/pubstuff/freenet-periodic-high-io-2.jpg
> 
> It definitely seems daily/periodic... it seems to occur pretty much
> every single day at 8pm. It just happened an hour ago, for example, and
> resulted in "load average: 7.09, 6.12, 5.38" which seriously bogged
> down my system, so I had to kill/restart my node :\. Ideas?

Maybe you could get a stack dump during that period?

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