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Hi Alessandra, > I suspect (and might be wrong) that the kernel tuning Kostas has applied > to IC might be useful. I was waiting for him to say something more about > it. :) I was looking for more information from him aswell! > In the meantime you can look at this page > > https://uimon.cern.ch/twiki/bin/view/LCG/ServiceChallengeTwoProgressSARALogbook Thanks for the link, I think this could prove useful. Greig > > cheers > alessandra > > On Wed, 27 Jul 2005, Greig A Cowan wrote: > > > Hi all, > > > > Our pool node has been taking a bit of a pounding during the FTS transfer > > tests from RAL. The machine has 16GB of RAM all of which was being used to > > handle the transfers. You will be able to see the high memory and CPU > > usage using the Ganglia page for our pool node: > > > > http://mon.epcc.ed.ac.uk/ganglia/?r=day&c=ScotGrid-Edinburgh&h=dcache.epcc.ed.ac.uk > > > > 8 parallel transfers were being used during these tests. > > > > Have any of the other Tier-2s (IC, Lancaster) experienced this sort of > > behaviour during sustained transfers? What about RAL? Andrew Sansum > > definitely mentioned that RAL and SARA may have been seeing a problem like > > this that was solved by reducing the number of parallel transfers. > > > > I think it would be good to find out if this was just an issue with > > Edinburghs setup or a more general dCache issue due to java processes > > consuming large amounts of pool node resources. This may be an issue we > > see more of once all Tier-2s get an SRM (assuming they use dCache that > > is!). > > > > Any information would be useful. > > > > Thanks, > > Greig > > > > > > -- > > ======================================================================== > > Dr Greig A Cowan http://www.ph.ed.ac.uk/~gcowan1 > > School of Physics, University of Edinburgh, James Clerk Maxwell Building > > > > DCACHE PAGES: http://www.gridpp.ac.uk/deployment/admin/dcache/index.html > > ======================================================================== > > > > -- ======================================================================= Dr Greig A Cowan http://www.ph.ed.ac.uk/~gcowan1 School of Physics, University of Edinburgh, James Clerk Maxwell Building DCACHE PAGES: http://www.gridpp.ac.uk/deployment/admin/dcache/index.html =======================================================================