Interestingly enough malloc(3) on Lucid Lynx box says: malloc() allocates size bytes and returns a pointer to the allocated memory. The mem

Interestingly enough malloc(3) on Lucid Lynx box says: malloc() allocates size bytes and returns a pointer to the allocated memory. The memory is not cleared. whereas Lion says nothing particular about it So I wrote a quickie: #include <stdlib.h> #include <stdio.h> int main() { int m = 1024*1024; //1M int t = 1024*m; //total count: here 1G char *v = calloc(1, t*sizeof(char)); //total size: 1GB for(int i=0; i<t; i++) { if (v[i] != 0) { printf("%016u @%x %x\n", i, v+i, v[i]); } else if (i % (t/10) == 0) { printf("%016u @%x\n", i ,v+i); } } } Ran multiple times with various sizes including big enough sizes (t) to statistically cover a good deal of physical RAM, and the trigger never triggers. I notice though that on Mac OS X the program starts right on the spot, while there is always a constant delay on Lucid. Looks like one zeroes on demand (by chunks probably) whereas the other zeroes initially.