Sorry to be the bearer of bad news... I configured on an SGI Altix UV with only "--enable-debug --enable-static --prefix=..."
The configure script found the sn/xpmem.h header and threfore enabled btl:vader: --- MCA component btl:vader (m4 configuration macro) checking for MCA component btl:vader compile mode... static checking --with-xpmem value... simple ok (unspecified) checking --with-xpmem-libdir value... simple ok (unspecified) checking xpmem.h usability... no checking xpmem.h presence... no checking for xpmem.h... no checking sn/xpmem.h usability... yes checking sn/xpmem.h presence... yes checking for sn/xpmem.h... yes looking for library without search path checking for xpmem_make in -lxpmem... yes checking if MCA component btl:vader can compile... yes However, not only was btl:vader failing at runtime on the Altix when I last checked, but the version of the code in 1.7.5rc5 won't build: Making all in mca/btl/vader make[2]: Entering directory `/brashear/hargrove/OMPI/openmpi-1.7.5rc5-linux-x86_64-uv/BLD/ompi/mca/btl/vader' CC btl_vader_module.lo In file included from /usr/users/6/hargrove/SCRATCH/OMPI/openmpi-1.7.5rc5-linux-x86_64-uv/openmpi-1.7.5rc5/ompi/mca/btl/vader/btl_vader.h:76, from /usr/users/6/hargrove/SCRATCH/OMPI/openmpi-1.7.5rc5-linux-x86_64-uv/openmpi-1.7.5rc5/ompi/mca/btl/vader/btl_vader_module.c:26: /usr/users/6/hargrove/SCRATCH/OMPI/openmpi-1.7.5rc5-linux-x86_64-uv/openmpi-1.7.5rc5/ompi/mca/btl/vader/btl_vader_endpoint.h:28:19: error: xpmem.h: No such file or directory I think the safest/fastest fix is the following 1-line change to prevent locating sn/xpmem.h, which is Altix-specific: --- ompi/mca/btl/vader/configure.m4 (revision 31166) +++ ompi/mca/btl/vader/configure.m4 (working copy) @@ -23,7 +23,7 @@ AC_ARG_WITH([xpmem], [AC_HELP_STRING([--with-xpmem(=DIR)], [Build with XPMEM kernel module support, searching for headers in DIR])]) - OMPI_CHECK_WITHDIR([xpmem], [$with_xpmem], [include/xpmem.h include/sn/xpmem.h]) + OMPI_CHECK_WITHDIR([xpmem], [$with_xpmem], [include/xpmem.h]) AC_ARG_WITH([xpmem-libdir], [AC_HELP_STRING([--with-xpmem-libdir=DIR], This patch is intended for 1.7 only - lets leave the trunk as-is. -Paul -- Paul H. Hargrove phhargr...@lbl.gov Future Technologies Group Computer and Data Sciences Department Tel: +1-510-495-2352 Lawrence Berkeley National Laboratory Fax: +1-510-486-6900