gh-110693: Use a Larger Queue for Per-Interpreter Pending Calls #118302
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This is an improvement over the status quo, reducing the likelihood of completely filling the pending calls queue. However, the problem won't go away completely unless we move to an unbounded linked list or add a mechanism for waiting until the queue isn't full.
FYI, I picked 300 because it is substantially larger, but not so large it will waste much memory. Each item in the array is 20 bytes, so an array of 300 is 6kB (per interpreter). Previously it was about 1/10th of that.