Philippe, This worked! Thank you so much for your help. So your hypothesis is correct. The huge_pages (at least on my system) have an alignment issue if MAP_FIXED is used, and no alignment issue if it's not used.
The syswrap-generic.c seems to always use MAP_FIXED, is that a valgrind requirement? At any rate, I filed a bug report, and attached a potential patch (which worked for me), but I'm not sure if I did this correctly. All I did is added another "refinement" fallback to do a 3rd mmap() ignoring the MAP_FIXED. This could be done better though but maybe giving aspacemanager a hint to give me a hugepage_size aligned address if it fails the second time. Here is the bug report and the patch should be attached (again the patch is brutally simple). https://bugs.kde.org/show_bug.cgi?id=333051 Also I have another issue but it seems to work, for now… I get a warning with: ==21390== Warning: noted but unhandled ioctl 0x7801 with no size/direction hints Any ideas what that is? -- View this message in context: http://valgrind.10908.n7.nabble.com/mpich-unable-to-munmap-hugepages-tp49150p49181.html Sent from the Valgrind - Users mailing list archive at Nabble.com. ------------------------------------------------------------------------------ _______________________________________________ Valgrind-users mailing list Valgrind-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/valgrind-users
