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Support use of xrootd by HEP experiments

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Subject:
From:
Andrew Hanushevsky <[log in to unmask]>
Date:
4 Mar 2005 17:45:30 -0800 (PST)Fri, 4 Mar 2005 17:45:30 -0800 (PST)
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Hi Pete,

It's part of the root protocol. That part was extended to xroot as well.

Andy

On Sat, 5 Mar 2005, Peter Elmer wrote:

>   Hi Wilko,
>
> On Fri, Mar 04, 2005 at 12:22:00PM -0800, Wilko Kroeger wrote:
> > Ok, thanks. I will try out the head.
> > If possible we should also fix the problem that the kXR_force
> > is used. It seems to me quite dangerous that two clients
> > can write to the same file or one could over write piece
> > of an existing file.
>
>   I agree completely. I am hoping Fabrizio will address this problem
> as soon as possible, but am actually surprised that the server allows this...
>
>                                    Pete
>
> > On Thu, 3 Mar 2005, Peter Elmer wrote:
> >
> > >   Hi Wilko,
> > >
> > >   Just for the record, Fabrizio just wrote (as part of a CVS commit):
> > >
> > > On Thu, Mar 03, 2005 at 07:33:42PM +0000, Fabrizio Furano wrote:
> > > > Hi again,
> > > <...>
> > > >  With this one I am no longer able to make xrdcp crash under heavy load
> > > > in the client/server machine. I am still investigating on the occasional
> > > > cpu eating, but it seems that that's more difficult, since in my tests,
> > > > the problem disappears when enabling the client side log, and for some
> > > > strange reason I am not able to spot it by attaching gdb to the process.
> > > >
> > > > Fabrizio
> > >
> > >                                    Pete
> > >
> > >
> > > On Mon, Feb 28, 2005 at 12:26:48AM -0800, Wilko Kroeger wrote:
> > > > Hello Fabrizio
> > > >
> > > > I run the xrdcp test again and I can reproduce crashes in xrdcp
> > > > (some times it take 30-60 mins).
> > > > I used the xrootd version 20050226-0825 and xrdcp is running on a RHEL3
> > > > machine. I read the same file over and over:
> > > >   xrdcp -DIDebugLevel 2 root://${xrdhost}:2094///prod/test/small.test - > /dev/null
> > > >
> > > > The size of the small.test file is:
> > > > > ls -l small.test
> > > > rw-r--r--   1 wilko  ec  31457280 Feb 27 18:09 /u1/wilko/kanga/prod/test/small.test
> > > > which is 30 MB (30*1024*1024)
> > > >
> > > > I used debugLevel 1 and 2.
> > > >
> > > > You can find the core file and the debug output files in:
> > > > ~wilko/bbdev/work/xrootd/core/20050227_2233_d1/
> > > > ~wilko/bbdev/work/xrootd/core/20050227_2302_d1/
> > > > ~wilko/bbdev/work/xrootd/core/20050227_2314_d2/
> > > > ~wilko/bbdev/work/xrootd/core/20050227_2350_d2/
> > > >
> > > > each directory contains a core file and the debug output file
> > > > (wk_log...). The ending d1 or d2 means debuglevel 1 or 2.
> > > >
> > > > With debug option = 1, gdb shows:
> > > > #0  0x0018b17c in memcpy () from /lib/tls/libc.so.6
> > > > #1  0x0806edbc in XrdClientReadCacheItem::GetPartialInterval(void const*,
> > > >     long long, long long) (this=0x9f107d0, buffer=0xb5750d08,
> > > >     begin_offs=31457280, end_offs=31714559) at XrdClientReadCache.hh:93
> > > >
> > > > whereas with debugLevel=2, gdb shows:
> > > >
> > > > #0  0x00a4e027 in _int_free () from /lib/tls/libc.so.6
> > > > #1  0x00a4d018 in free () from /lib/tls/libc.so.6
> > > > #2  0x0806d984 in ~XrdClientReadCacheItem (this=0x96b3db8) at
> > > >     XrdClientReadCache.cc:40
> > > >
> > > >
> > > > On the xrootd site I see the error:
> > > > 050227 23:54:39 064 XrdLink: Unable to receive from wilko.30110:17@tori0001;
> > > >        connection reset by peer
> > > > 050227 23:54:39 064 XrootdXeq: wilko.30110:17@tori0001 disc 1:02:03 (link
> > > >        read error)
> > > >
> > > > (the corresponding client crash was around 23:50)
> > > >
> > > >
> > > > Thanks for looking into this,
> > > >
> > > > Wilko
> > > >
>
>
>
> -------------------------------------------------------------------------
> 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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