pytorch

d7ff34c0 - In torch::save() avoid zip compressing small header records. (#28180)

In torch::save() avoid zip compressing small header records. (#28180) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/28180 ScriptModuleSerializer::writeCode() is the only place during torch::save() serialization where we attempt to zip compress records. This change avoids compressing these string records if they are sufficiently small - e.g. in the example I looked at: - the strings were 123 and 28 bytes, respectively. - the cost in the compression routines was 16.5% of the torch::save() cost. (we're building a huffman table for a 28 byte string). We'd save time and not significantly affect the space if we add these 1-line conditional compressions, rather than making it unconditional. ghstack-source-id: 92104517 Test Plan: Benchmark: experimental/jeremyl/c2:SerializationBench Correctness: normal buck mode/dev-nosan caffe2/test/... Differential Revision: D17967995 fbshipit-source-id: 7ff934388533645dc987e105c814ffe6324f4596