[Rivet] RE : RE : installation problems (It works!)

[Judith Katzy]

Let me clarify:
Pythia uses .2 version
Herwig uses .3 version

sorry for the confusion,
Judith

On Wed, 30 Jul 2008, Jonathan Butterworth wrote:

> Argh indeed. This is probably my fault, sorry Andy. I knew what the .2 meant 
> and I thought you did too. One of those hidden bits of knowledge, apologies.
>
> While we are at it, the .3 distinction was introduced by request of ATLAS and 
> has the no-automatic flag in for fortran compilation. Actually I think all 
> the relevant fortran is safe against this, and I am not sure what the real 
> status of this patch is. I thought ATLAS were using it, but since Judith says 
> not, I guess we moved on?
>
> Jon
>
> Judith Katzy wrote:
>> 
>> Hi Andy,
>> 
>> just for your information: Atlas uses the .2 versions with common block
>> size 10000.
>> 
>> cheers,
>> Judith
>> 
>> On Tue, 29 Jul 2008, Andy Buckley wrote:
>> 
>>> Aaargh! That's the first time anyone has ever mentioned that! Is it
>>> documented anywhere? Wouldn't it be more normal to have the '.2'
>>> versions as the exception rather than the norm?
>>> 
>>> Maybe it should also be recommended to the collaborations that they use
>>> this trick to dynamically work out the common block size rather than
>>> hard-coding it... although I'm not sure if this propagates to Fortran
>>> gens like TAUOLA, PHOTOS, etc. who might like to dig into the HEPEVT
>>> common block and can't do this dynamic size trick.
>>> 
>>> I thought that the '.2' versions were Genser patches (hence our requests
>>> that they be hidden from users, who shouldn't be exposed to details of
>>> the build system patches). That makes more sense now: AGILe requests the
>>> 4000-size generators, expecting that name to be a symlink to the latest
>>> patch version. I'll update the AGILe loader to prefer the '.2' Pythia
>>> and Herwig libs, and these fixes will make us more robust against using
>>> the "wrong" version in future.
>>> 
>>> Thanks for the help and clarification!
>>> Andy
>>> 
>>> 
>>> James Monk wrote:
>>>> So in that case AGILe should probably load the xx.2 version of the
>>>> generators
>>>> 
>>>> On 29 Jul 2008, at 18:12, Mikhail Kirsanov wrote:
>>>> 
>>>>> Hello,
>>>>> In GENSER, .2 in the version always means HEPEVT size 10000. So,
>>>>> pythia 418 has a size
>>>>> 4000, and 418.2 has a size 10000.
>>>>> For some time we thoght that all experiments moved to 10000, but then
>>>>> it turned out that
>>>>> CMS still uses the size 4000. For this reason, for some pythia
>>>>> versions there is no 4000 subversion.
>>>>>                                             Mikhail
>>>>> 
>>>>> 
>>>>> -----Original Message-----
>>>>> From: James Monk [mailto:jmonk at hep.ucl.ac.uk]
>>>>> Sent: Tue 7/29/2008 6:59 PM
>>>>> To: Andy Buckley
>>>>> Cc: Mikhail Kirsanov; Holger Schulz; genser-developers;
>>>>> rivet at projects.hepforge.org
>>>>> Subject: Re: RE : RE : [Rivet] installation problems (It works!)
>>>>> 
>>>>> It seems like the max number of records in the event is actually set
>>>>> at 4000 (found in pyhepc.F as the parameter NMXHEP), which is what
>>>>> caused the problem.  The fix Andy submitted to AGILe works for me
>>>>> because NMXHEP gets copied into MSTU(8).
>>>>> 
>>>>> I have a question tho'.  It looks to me that the AGILe number of
>>>>> entries has been 10,000 for quite some time (at least as far back as
>>>>> the original AGILe 1.0 release), yet this is the first time it
>>>>> breaks.  Did NMXHEP get decreased at some point in the Genser release
>>>>> from 10,000->4000?  Is 4000 a long enough record at the LHC (I thought
>>>>> the option of 10,000 was added specifically for the LHC!).
>>>>> 
>>>>> In fact, I just checked ATLAS' Pythia interface and I see this:
>>>>> 
>>>>> HepMC::HEPEVT_Wrapper::set_max_number_entries(10000);
>>>>> 
>>>>> This is not so good, right?
>>>>> 
>>>>> -James
>>>>> 
>>>>> On 29 Jul 2008, at 17:01, Andy Buckley wrote:
>>>>> 
>>>>>> Mikhail Kirsanov wrote:
>>>>>>> I would recommend to set it automatically, example is here:
>>>>>>> $MCGENERATORS/pythia6/418/share/examples/main78.cc
>>>>>> Thanks Mikhail, this seems to work for me. I've committed it to SVN -
>>>>>> can you try, James?
>>>>>> 
>>>>>>> There is the corresponding possibility also in Herwig installed
>>>>>>> in GENSER, if you want I can give you example.
>>>>>> I'd be very grateful if you could point me at it... it will be good to
>>>>>> have this fragility eliminated at last!
>>>>>> 
>>>>>> Andy
>>>>>> 
>>>>> 
>>> 
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>
> -- 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Prof. Jonathan Butterworth,              http://www.hep.ucl.ac.uk/~jmb/ 
> Physics and Astronomy Department                  Tel: +44 20 7679 3444
> University College London                 Gower St, London WC1E 6BT, UK
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>