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VUB-RECOIL  October 2002

VUB-RECOIL October 2002

Subject:

Re: problems on AWG18

From:

Urs Langenegger <[log in to unmask]>

Reply-To:

[log in to unmask]

Date:

31 Oct 2002 11:57:25 -0800Thu, 31 Oct 2002 11:57:25 -0800

Content-Type:

text/plain

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text/plain (59 lines)


Hoi,

just a few thoughts. Not prioritized.

1. We can run over all data and all MC within 4 hours under normal
   network/server conditions with 20 parallel jobs. We don't need >
   100 jobs for that. Not with anaRecoil, but with anaQA. Identical
   output, but no superfluous histograms. There have been exchanges
   about those histograms and they need not repeated here.

2. A very serious problem (in addition to the raw number of jobs) is
   that Daniele's chain do not make use of a 'new' input format
   implemented weeks ago in both anaQA and anaRecoil: While chaining
   you can either specify just a filename or a filename and the number
   of events. If you do the former, ROOT will open the file, extract
   the number of events, close it. Go to the next file. Do that for
   all files in the chain. Multiply by 100, if all of your jobs start
   up at the same time in the long queue. (Or at least 125.) You
   will completely saturate and kill any server. On the other hand,
   if you do specify the number of events, ROOT opens the rootfiles
   only for processing, and then we have some CPU cycles to spend and
   the access is quickly becoming asynchronous. It might be beneficial
   to switch to the new chaining scheme. At least consider it.

3. The difference between the servers can be extracted from

   http://monitor/host.php

   and entering sulyky% into the search field.

    sulky25:/AWG18 619788288 410758632 195965336 68% /a/sulky25/AWG18
    sulky26:/AWG23 619788288 168376 580893672 1% /a/sulky26/AWG23
    sulky13:/AWG7 1000652800 781913464 205071112 80% /a/sulky13/AWG7
    sulky09:/AWG8 500340736 492076992 8199392 99% /a/sulky09/AWG8

   AWG8 is on one of the older servers available at SLAC, a
   Netra-t-1400/1405. It was beaten to death repeatedly. AWG7 was much
   better, and AWG12 as well.

   AWG18 is on a sun Fire-280R. These servers should be able to serve
   several TB (according to SCS). We replaced an aging Netra of the
   Group C disks in May with such a model, and the performance went up
   significantly. You can still kill it, and you can even do that with
   block I/O and HBK (Henning can tell the story).

4. I have not yet verified that the messages

 Error in <TFile::TFile>: file /nfs/farm/babar/AWG18/ISL/sx-080702/data/2000/output/outputdir/AlleEvents_2000_on-1099.root does not exist

   are actually bad when encountered while processing chains (in the
   new scheme). The situation might be different when trying to chain.
   Note that I do not say it does not matter.

Cheers,
--U.


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