benchmark

f6902624 - Various small bugfixes, add CachingPrecompile to torchbench (#158847)

Various small bugfixes, add CachingPrecompile to torchbench (#158847) Summary: This PR addresses a few small bugfixes needed to make NanoGPT inference work, and also adds a new `--caching-precompile` argument to torchbench. With `--caching-precompile`, after every benchmark we save precompile artifacts to DynamoCache, allowing us to test caching precompile on all existing benchmarks. The following bugfixes are in this PR to make all of this work: - Fix global variables being pruned with DUPLICATE_INPUT guards. DUPLICATE_INPUT guards have additional vars from the second input, which we track with additional_local_vars, but we never tracked additional global variables. This fixes the issue. (See torch/_dynamo/guards.py changes) - Return None from PRecompileContext.serialize() if no new dynamo compiles occurred. There's no reason to save artifacts (i.e. autotuning artifacts, etc) if no dynamo_compile occurred, so we return None early. We may later want to support editing existing dynamo artifacts as a TODO, but that's upcoming. - log `dynamo_start` on CompilePackage.load: This is only needed so that tlparse doesn't ignore TORCH_TRACE logs generated when caching precompile hits. If there are no actual compiles, we never log a "dynamo_start" entry, which makes internal tlparse ignore the TORCH_TRACE file. ## Test Plan After this PR, the following now works: ``` TORCH_LOGS=dynamo tlp python benchmarks/dynamo/torchbench.py --only nanogpt --performance --inference --backend inductor --caching-precompile --warm-start-latency ``` tlparse result (internal): Cold Start (6 seconds): https://manifold.edge.x2p.facebook.net/v0/read/tree/logs/.tmpAWe0zD/dedicated_log_torch_trace_vk9nkp4m.log/index.html?bucketName=tlparse_reports&apiKey=tlparse_reports-key&withPayload=1&timeoutMsec=10000 Warm Start (~1 s): https://manifold.edge.x2p.facebook.net/v0/read/tree/logs/.tmpAWe0zD/dedicated_log_torch_trace_5l4iwrpm.log/index.html?bucketName=tlparse_reports&apiKey=tlparse_reports-key&withPayload=1&timeoutMsec=10000 The 1 second of warm start here can be improved: the costs here are mostly in starting up workers and triton and initializing CUDA, a lot of which should not be included in the compile time cost in real world scenarios where these are already loaded before training begins. X-link: https://github.com/pytorch/pytorch/pull/158847 Approved by: https://github.com/zhxchen17 Reviewed By: ZainRizvi Differential Revision: D78900025 fbshipit-source-id: 8d266f05561f7aac8dc75e89ef657e64aeb51ed0