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Hi Allessandra, Everyone here is in agreement; xrootd tries to minimize it's use of memory (actually there is a rather involved algorithm to do memory trimming on the fly). The kan cluster machine here which recently served 150 BaBar root clients sat on 360MB of memory. Andy ----- Original Message ----- From: "Fabrizio Furano" <[log in to unmask]> To: "Alessandra Forti" <[log in to unmask]> Cc: "Peter Elmer" <[log in to unmask]>; <[log in to unmask]> Sent: Wednesday, May 24, 2006 5:58 AM Subject: Re: New xrootd development version 20060523-1741 available > Hi Alessandra, > > typically the memory needs of a server are proportional to the number of > clients and to the ongoing activity rates. For a small number of clients > (let's say 1-100) the memory needs are quite low. I've done many many > stress tests in a pIII machine with 256 megs with no problems at all. The > memory becomes an important parameter when you plan thousands of clients > per server. > > Fabrizio > > 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 >>>> ------------------------------------------------------------------------- >>>> >>> >> >