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Support use of xrootd by HEP experiments

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Subject:
From:
Andrew Hanushevsky <[log in to unmask]>
Reply To:
Support use of xrootd by HEP experiments <[log in to unmask]>
Date:
Sat, 13 Jul 2013 12:49:40 -0700
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TEXT/PLAIN
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TEXT/PLAIN (69 lines)
Hi Adrian,

Actually, we keep previous releases so that we can look back at core 
files. However, since you do mention this is Alice, we know that the 
release you are using is a custom build (i.e. the base code has been 
modified). So, yes, we wouldn't be able to make much sense of a core file 
but only because of that issue. A pstack would certainly give us a broad 
view of the issue; along with the log file of the day.

Andy

On Sat, 13 Jul 2013, Adrian Sevcenco wrote:

> On 07/12/2013 10:44 PM, Andrew Hanushevsky wrote:
>> Hi Adrian,
> Hi!
>
>> Not at all. XRootD is fully multi-threaded and can use as many cores as
>> you have. When this situation occurs it's normally due to an error in a
>> plug-in where all the requests pileup on a single core. When you see
>> this happen, a simple pstack of the process along with the day's log
>> file will help us determine what the issue is. Did this resolve itself?
> No, at random times (depending of the number of requests) the
> dataservers gets locked and i have to restart the xrootd services ..
> Given that ALICE use at best 3.2.6 i imagine that would be pointless to
> give you gdb traces from the core dumps (when the services coredumps)..
> At the next locked xrootd i will post  a pstacks and a link to logs...
>
> Thanks!
> Adrian
>
>
>
>>
>> Andy
>>
>> On Fri, 12 Jul 2013, Adrian Sevcenco wrote:
>>
>>> Hi! Is xrootd single threaded? When there is load on the data servers is
>>> see only 1 core at 100% ...
>>> Can i conclude that for data servers is better to have less cores with
>>> higher frequencies?
>>>
>>> Thank you!
>>> Adrian
>>>
>>>
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