 |
 |
Hello Alessandra, Andy talked mostly about scalability and performance tests of xrootd and trying to show the behavior of xrootd at upper limits I believe. I don't know nothing about the fact that xrootd uses a lots of memory. We are using xrootd on WNs and we have deployed it on 320 nodes with about 130TB. These nodes are heavily loaded by user's jobs, mostly ROOT jobs. For your imagination, I am sending you plots being produced by really home-made monitoring with Ganglia toolkit. I also need to mention, that you have to divide these numbers by the factor of two, because we are running two instances of xrootd per node (we have a development and production cluster). You can see that memory usage is really, really small. Cheers Pavel Alessandra Forti wrote: > Apologies that worries me in using xrootd on the WNs.... > I'm a bit confused right now :( > > Alessandra Forti wrote: >> Hi Peter, >> >> after yesterday I also remember that the second thing that worried me >> in using dcache on the WN is a comment Andy made about the use of >> memory in his talk at CHEP I believe. He said it xrootd uses a lot of >> memory but there weren't number specified. >> >> My system is double cpu with 2GB of memory per cpu. Considering that >> an atlas job can use more than 1 GB we are now at 1.1 I thik. Will it >> be enough? I think so but I just wanted to check. >> >> cheers >> alessandra >> >> >> Peter Elmer wrote: >>> Hi All, >>> >>> There is now a new xrootd development version: xrootd >>> 20060523-1741, please see: >>> http://xrootd.slac.stanford.edu/download/20060523-1741/ >>> >>> for downloads. >>> >>> Relative to the last development build (20060418-0404) this >>> includes a variety of small bug fixes, plus one important one for >>> the redirector. See >>> the xrootd.History file for more details. I've included a link to the >>> SL3 debuginfo rpm on the rpm page. (Although I've not tried it myself, >>> so I have no idea if it works! Feedback is welcome.) >>> >>> Gerri, if it is still possible, you could add this to the next ROOT >>> build, too. >>> >>> For the full set of changes and links to rpms/tarballs to >>> download see the >>> the xrootd web page and/or version history: >>> >>> http://xrootd.slac.stanford.edu >>> http://xrootd.slac.stanford.edu/xrootd.History >>> >>> Let us know if there are problems. >>> >>> Pete >>> >>> ------------------------------------------------------------------------- >>> >>> Peter Elmer E-mail: [log in to unmask] Phone: +41 (22) >>> 767-4644 >>> Address: CERN Division PPE, Bat. 32 2C-14, CH-1211 Geneva 23, >>> Switzerland >>> ------------------------------------------------------------------------- >>> >> >