for now proteced with the PRINT_WORKER_STATS macro (activated by default) 


git-svn-id: svn+ssh://hades.bordeaux.inria.fr/home/SVN/HIEPACS-STG/linear-algebra/hybrid-gpu/trunk/morse_like_cg@834 b5bd1476-4870-4fd0-a9fc-6429bbb67506