Unable to Allocate Memory

Question

I am unable to allocate memory using the following code:

int *h_VC = (int *)malloc(sizeof(int)*SIZE); //SIZE is 19200 if(h_VC==NULL) { printf("Memory Not avaialble"); }

My code uses the above block in a while loop and is run several times. I have 8GB memory. I am monitoring the free memory at the same time when running the code.
The memory allocation is failing although i have arround 3GB of free memory left.
What could be the problem?

Just a note: don't cast the returned pointer of malloc. Theres no need to and it is possibly dangerous. — Constantinius
– Constantinius, Commented Dec 13, 2011 at 13:03
Don't know if this is the case, but it might help: stackoverflow.com/questions/605845/… — supertopi
– supertopi, Commented Dec 13, 2011 at 13:04
If it's a 32-bit program running in a 64-bit OS, you can still have plenty of free memory in the OS, but exhausted address space in the program due to memory fragmentation or leaks or just too many too big allocations. Which one it is it's hard to tell without any additional information about the program and OS. — Alexey Frunze
– Alexey Frunze, Commented Dec 13, 2011 at 13:31

Fred Foo · Accepted Answer · 2011-12-13 13:03:30Z

5

Anything could be the problem. Replace the printf with

perror("");

to get a hint.

answered Dec 13, 2011 at 13:03

Fred Foo

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2 Comments

Luchian Grigore Over a year ago

Except beer... Beer is never the problem... +1

Constantinius Over a year ago

Beer is the cause and the solution to all problems in life. - Homer J. Simpson

scatman · Accepted Answer · 2011-12-14 10:09:28Z

I am using Visual Studio as a compiler. Compiling the program as x64 solved the issue.
thanks to Alex's comment.

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