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

[James Monk]

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
>>
>
>