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
>>>> -------------------------------------------------------------------------
>>>>
>>>
>>
>
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