Make JIT Serialization support arbitrary std::function<> IO (#27586)
Summary:
Right now, torch::save() uses std::ostream, which results in unnecessary
data copies in practice. Similar for torch::load().
Adding a std::function<size_t(const void*, size_t)> as an output option,
parallel to the existing filename and std::ostream apis, gives users the
flexibility to emit directly to a backing store.
For a simple case of appending the output to a std::string, we observe
significant benchmark savings (on order of -50%), even with the
minor std::function<> dispatch overhead. The main reason is that
std::ostringstream effectively requires 2 extra copies of the data
beyond a simple string.append lambda.
We also provide a parallel api for the load(), though this one is
slightly more complex due to the need to do arbitrary position reads.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27586
Test Plan:
buck test mode/dev-nosan caffe2/test/...
(Basic serialization test in caffe2/test/cpp/api/serialize.cpp)
Benchmark in experimental/jeremyl/c2/SerializationBench.cpp, with D17823443
(1M time goes from 90ms -> 40ms, albeit with crc patch applied)
Differential Revision: D17822962
Pulled By: jjlilley
fbshipit-source-id: d344a7e59707f3b30d42280fbab78f87399e4d10
