Hello dear all, WHAT: We would like to integrate the changes on the memchecker-branch to trunk, as planned in the
WHY: The checking offers memory checking for certain User and OMPI-internal errors, like buffer overruns, size mismatches, checks for wrong send/receive buffers. WHERE: OMPI trunk and v1.3 phase3 WHEN: Integration into Trunk of memchecker branch: 25.1. (although off-by-default, this leaves enough time before Feature Freeze on 8.2.) TIMEOUT: None =============================================================== The memchecker branch contains checks for memory buffer faults either in the User-Code or in ompi-code itself. It uses the valgrind-API to set/reset buffer validity of the user buffers passed to the MPI-layer. Additionally ompi-internal datatypes are checked for. Both are configurable using the flags: --enable-memchecker --with-valgrind=DIR (if needed) A decent/recent valgrind is needed (for getting and setting VBITS/using the newer macros). The valgrind-version is being checked for, at least version 3.2.0 is required. The actual checking is done in the MPI-layer, in order not to trap any (correct) access in the BTL, the user buffer is reset to accessible in the PML-layer (currently OB1 -- others won't make much sense?). The default behaviour is to *NOT* enable memchecker. If it is enabled, but not valgrind is being run, the costs for the buffer checks are minimal, the costs for each ompi-datastructure (like datatype, or communicator passed) is not. Further information regarding penalties and performance may be found in: http://www.open-mpi.org/papers/parco-2007 Comments from the Paris meeting have been integrated. Are there any objections or hints? With best regards, Shiqing and Rainer PS: If --enable-memchecker is on, --enable-debug should be on as well to make sense. -- ---------------------------------------------------------------- Dipl.-Inf. Rainer Keller http://www.hlrs.de/people/keller HLRS Tel: ++49 (0)711-685 6 5858 Nobelstrasse 19 Fax: ++49 (0)711-685 6 5832 70550 Stuttgart email: kel...@hlrs.de Germany AIM/Skype:rusraink "Emails save time, not printing them saves trees!"
