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Type: Bug
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Resolution: Done
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Priority: Major - P3
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Affects Version/s: 1.0.0
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Component/s: None
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None
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Environment:Mac OS X 10.10.1
When running mongo-sim with 300 client threads on OS X, I'm getting the following error from each thread:
Failure to buffer 4 bytes: Failed to buffer 4 bytes within 300000 milliseconds.
Note that each thread reports this almost immediately; it's not timing out after 300 seconds or anything. You can reproduce by checking out 10gen/mongo-sim.git, building, and running the following from the build directory:
./src/simulation/mongo-sim -w workloads/simple_read -t 300 -e 10000
This spawns 300 client threads, one mongoc client per thread and executes a query 10,000 times total. Each thread executes a query operation 33 or 34 times, then iterates over every document in a tight loop (using mongoc_cursor_error(), mongoc_cursor_more() and mongoc_cursor_next() as outlined in cursor.hpp's Cursor::itcount() method.
Note that the same error occurs when running an insert-only workload (change -w to insert_only). I have not been able to reproduce this issue on Linux.
Sorry I haven't been able to narrow this down to a minimal reproducible case yet. I don't have many free cycles, but I'm happy to help anywhere I can.