![]() ![]() ![]() The default stack reservation size used by the linker is 1 MB. Thread or fiber creation fails if there is not enough memory to reserve or commit the number of bytes requested. The default size for the reserved and initially committed stack memory is specified in the executable file header. It is not freed if the thread is terminated by another thread. Every page that is reserved for the stack cannot be used for any other purpose.Ī stack is freed when its thread exits. ![]() It is best to choose as small a stack size as possible and commit the stack that is needed for the thread or fiber to run reliably. The system commits additional pages from the reserved stack memory as they are needed, until either the stack reaches the reserved size minus one page (which is used as a guard page to prevent stack overflow) or the system is so low on memory that the operation fails. The initially committed pages do not utilize physical memory until they are referenced however, they do remove pages from the system total commit limit, which is the size of the page file plus the size of the physical memory. As such, the reserved size is limited to the virtual address range. The reserved memory size represents the total stack allocation in virtual memory. Each new thread or fiber receives its own stack space consisting of both reserved and initially committed memory.
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