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The strange limitation of 64 threads
Delphi and stuff
– When using the Windows I/O Completion Port (IOCP), people seem to limit their thread pools to a maximum of 64 threads. This is probably caused by the fact that WaitForMultipleObjects limits the number of input handles with the nice magic constant MAXIMUM_WAIT_OBJECTS (which happens to be 64). Here are a few examples: Creating a Thread Pool for MFC-Based ISAPI Extensions - this might be where it
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