Edward Z. Yang ezyang

I am trying to understand the lifecycle of the cuda graph memory pool, e.g., as interacted with in _cuda_releasePool. In particular, the implementation of _use_cuda_memory_pool_manager seems to suggest that the pool is released at the end of the context manager. But in the call sites of this function, it doesn't seem that the pool should be released (especially when we are allocating inputs for the cuda graph region). What is going on?

You're right to notice this apparent discrepancy. Let's break down what's happening with the CUDA graph memory pool lifecycle:

1. The _use_cuda_memory_pool_manager context manager is indeed calling _cuda_releasePool at the end of its context. However, this doesn't necessarily mean the pool is being destroyed or fully released.
2. The _cuda_releasePool function is part of the CUDA caching allocator's API, and its behavior is more nuanced than just destroying the pool:
   • It decrements the reference count for the pool.

• If the reference c

This is binary data corresponding to a serialized Thrift struct: Copy 18 03 66 6f 6f 16 c8 01 16 b0 df fd eb 0c 16 02 00 The code that generated it is Copy CppExampleLogEntry( userid=100, ip="foo", weight=1, time=CUR_TIME ) Explain, byte-by-byte, the meaning of each byte in the binary data.

I'll explain the binary data byte-by-byte based on the Thrift Compact protocol encoding described in the document:

1. 18: This is a field header byte.
   • 0001 1000 in binary
   • dddd (field id delta) = 1 (first field)

• tttt (field type) = 8 (BINARY, used for strings)

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