valgrind, profiling timer expired?

Question

I try to profile a simple c prog using valgrind:

[zsun@nel6005001 ~]$ valgrind --tool=memcheck ./fl.out
==2238== Memcheck, a memory error dete

Answer 1

You are not going to be able to compute 10000! like that. You will need some sort of bignum implementation for computing factorials. This is because int is "usually" 4 bytes long which means that "usually" it can hold 2^32 - 1 (signed int, 2^31) - 13! is more than that. Even if you used an unsigned long ("usually" 8 bytes) you'd overflow by the time you reached 21!.

As for what it "profiling timer expired" means - it means valgrind received the signal SIGPROF: http://en.wikipedia.org/wiki/SIGPROF (probably means your program took too long).