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VUB-RECOIL  March 2003

VUB-RECOIL March 2003

Subject:

n00 vs. o00

From:

Urs Langenegger <[log in to unmask]>

Reply-To:

[log in to unmask]

Date:

31 Mar 2003 19:06:51 -0800 (PST)Mon, 31 Mar 2003 19:06:51 -0800 (PST)

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (57 lines)


Hoi,

I looked a bit into this.

0. The n00  jobs were run  Jan 28, the  last three crashed  jobs ended
   very early  on Jan 29 (that  day was bad for  computing).  The next
   batch  of  jobs n01  (with  modified  recoilNtp.cc)  did not  start
   running before Jan  29 afternoon. I still think  that I was careful
   not to mess up the executables.

1. I   started   with   VubAnalysis  ale-012303   and   RecoilAnalysis
   ursl-011403 as the closest tags before running the n00 jobs and ran
   on  csx-bpcock-2002.  I  could not  reproduce the  results  of n00.
   (results is p.d. the number of events with IERR < 0).

2. Just to check, I put  back in the K-lepton charge correlation test.
   No reproduction of  n00. Again, I think that I  was careful back in
   January, despite the usual  high-pressure zone approaching from the
   east ....

3. I looked at CVS. I see that on Thu Jan 23 07:29:03 2003 someone
   committed a version of anaQA.cc that re-introduced 

     gRandom->SetSeed(processID);

   instead of 

     gRandom->SetSeed(randomSeed);
 
   into  the  executable.   This  is  something that  had  sneaked  in
   previously and had  been fixed before (read the  commit messages of
   Nov 28 01:28:41 2002, and also Wed Dec 11 01:28:25 2002) ...

   I fixed this  once again in my commit of Thu  Jan 30 00:10:16 2003,
   but I do not know whether that affected n00. I guess not.

Therefore  I currently  think that  n00  was running  with a  "random"
random seed (and  the printout in the logfile is  not relevant, as you
may see  when perusing CVS  web or the  source of the correct  tag). I
don't know how to find this out without a timestamp of the executable.
I think I'll add  that as a default dump like the  env dump we have in
IbuApp.

Archaeology is  a bit difficult  under time-constraints (not  from the
east, this time), so I may be  wrong. But I don't think so. But if you
manage to invest your own time and find something else, please post.

I still see no reason why n00 should be better than o00 or p00.


Cheers,
--U.



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