std::bad_alloc ulimit

Question

I'm working on a 32bit Ubuntu 12.04. The RAM is 7.7 GB. When I run a certain process (written in C++) and reaches 50% of RAM usage, such process throws a "std::bad_alloc". The strange thing is that heap size is unlimited (command ulimit -v returns "unlimted"). So which can be the cause?

score 5 · Answer 1 · answered Jan 10 '13 at 15:28

5

On most 32-bit platforms, it's impossible for a process to address more than 4GB (2^32 bytes) of virtual memory. On 32-bit Linux, 1GB of the address space is reserved for the kernel, so user processes are limited to 3GB of addressable memory.

answered Jan 10 '13 at 15:28

Mike Seymour

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score 3 · Answer 2 · answered Jan 10 '13 at 15:29

3

On a 32-bit machine, even with PAE, a single process address space cannot be larger then 4GB.

answered Jan 10 '13 at 15:29

Nikolai Fetissov

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std::bad_alloc ulimit

2 Answers2