Christopher's post about x86 hardware memory protection (in the "Is Linux really that secure?" thread) reminded me of something that C programmers may find useful for tracking memory faults. The first is electric fence (http://perens.com/FreeSoftware/), which places the end of each array at the end of a 4k memory page, and marks the next page as a fault. So if you overrun an array bounds it will segfault on the exact instruction that overran the array. You can also set it to test underflows. It uses a lot of memory though, and I've had problems with in on large projects. Valgrind, (http://valgrind.kde.org/) fully emulates an x86 CPU on your CPU, but with things like array under/overflow checks. It can also profile cache hits, etc. Very good, works with projects at least as large as KDE, but a little slow.
Brad
