[LHAPDF-announce] LHAPDF V5.5.0 released (low memory option)

[Mike Whalley]

Dear LHAPDF user,

The is to inform you that we have today released a new version 5.5.0
of lhapdf.  This can be downloaded as usual from our website:

http://projects.hepforge.org/lhapdf/

or directly at:

http://www.hepforge.org/archive/lhapdf/lhapdf-5.5.0.tar.gz

====================================================================
The reason for this release so soon after the last one is mainly to 
satisfy the request to produce a version with a smaller memory footprint 
for use in grid submission jobs:

This, and the few other changes, are to do with the organization of the 
programme, and there are no new pdfs sets in this release.

To summarize:
=============

  * memory overheads reduced with new "light" mode, which reduces the 
number of large 'Hessian' arrays allocated in some sets .

   This is turned on with the configuration flag --enable-low-memory. It 
should be emphasized that this severely affects the way in which the 
multi-member sets (such as the error sets) can be used and should only 
be used for single pdfs, or small numbers of different pdfs when memory 
allocation is an issue.  The maximum number of sets (as distinct from 
members) that can be used in a run remains at the default value of 3 but 
can be changed with the flag described in the following:

  * control of number of concurrent sets via configure flag

  This is changed from the default of 3 with the configure flag 
--with-max-num-pdfsets=n

  * fixed uninitialised variables which broke automatic install path
support on some platforms

  * bug fixes with shared-library common block initialisation

  * lots of smaller bug fixes, helped by conversion of steering code to
Fortran 90

===========================================================================
NOTE: for this version of lhapdf a Fortran 90 compiler needed for 
compilation. gfortran, g95, ifort and pgf90/95 have been successfully 
tested.
============================================================================

If you want to see more details look at the ChangeLog in:

http://projects.hepforge.org/lhapdf/ChangeLog

Any problems, as usual send them to lhapdf at projects.hepforge.org

Best regards,

Mike Whalley and Andy Buckley

IPPP
Durham University, UK