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I work on win7 and need to allocate 2 buffers using malloc ,each of 660M bytes
first allocation is OK,the secon buffer allocation fails.
I have 670G free mem on disk
What is maximum malloc size?And what could be the reason for above problem
The maximum valid
malloc()size is that is fit the state of the process heap. The heap can be fragmented (so, e.g. there’s a heap with 600M free memory chunk, then 20M used chunk, then 600MB free chunk again – you just can’t get 650M, although there are 1.2GB of free memory).Moreover, AFAIK, Windows mechanism of loading DLL ties every library to a certain address, so the memory may be already fragmented by DLLs.