This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback? In this article. Specifies the maximum amount of system VA space that can be used by the nonpaged pool. I need to know what would be the best route to overcome this with minimal work. Lee W, MVP.
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The bit version of Testlimit Testlimit Once the commit level reached the size of RAM, the rate of thread creation slowed to a crawl because the system started thrashing, paging out stacks of threads created earlier to make room for the stacks of new threads, and the paging file had to expand. The results are the same when the —n switch is specified, because the threads have the same initial stack commitment.
The number of processes that Windows supports obviously must be less than the number of threads, since each process has one thread and a process itself causes additional resource usage. If the only cost of a process with respect to resident available memory was the kernel-mode thread stack, Testlimit would have been able to create far more than 8, threads on a 2GB system.
Dividing the amount of resident memory Testlimit used 1. Since a bit kernel stack is 24K, that leaves about K unaccounted for. This acts as a guarantee to the process that no matter what, there will enough physical memory available to hold enough data to satisfy its minimum working set. The remaining roughly 6K is resident available memory charged for additional non-pageable memory allocated to represent a process.
A process on bit Windows will use slightly less resident memory because its kernel-mode thread stack is smaller.
As they can for user-mode thread stacks, processes can override their default working set size with the SetProcessWorkingSetSize function. Testlimit supports a —n switch, that when combined with —p, causes child processes of the main Testlimit process to set their working set to the minimum possible, which is 80K. Testlimit executed with the —n switch on a Windows 7 system with 4GB of RAM hit a limit other than resident available memory: the system commit limit:.
Here you can see the kernel debugger reporting not only that the system commit limit had been hit, but that there have been thousands of memory allocation failures, both virtual and paged pool allocations, following the exhaustion of the commit limit the system commit limit was actually hit several times as the paging file was filled and then grown to raise the limit :.
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