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denoland-deno/core/examples
Bert Belder 41c7e96f1a
Refactor zero-copy buffers for performance and to prevent memory leaks
* In order to prevent ArrayBuffers from getting garbage collected by V8,
  we used to store a v8::Persistent<ArrayBuffer> in a map. This patch
  introduces a custom ArrayBuffer allocator which doesn't use Persistent
  handles, but instead stores a pointer to the actual ArrayBuffer data
  alongside with a reference count. Since creating Persistent handles
  has quite a bit of overhead, this change significantly increases
  performance. Various HTTP server benchmarks report about 5-10% more
  requests per second than before.

* Previously the Persistent handle that prevented garbage collection had
  to be released manually, and this wasn't always done, which was
  causing memory leaks. This has been resolved by introducing a new
  `PinnedBuf` type in both Rust and C++ that automatically re-enables
  garbage collection when it goes out of scope.

* Zero-copy buffers are now correctly wrapped in an Option if there is a
  possibility that they're not present. This clears up a correctness
  issue where we were creating zero-length slices from a null pointer,
  which is against the rules.
2019-05-01 21:11:09 +02:00
..
http_bench.js Move deno_core_http_bench into examples dir (#2127) 2019-04-16 17:53:43 -04:00
http_bench.rs Refactor zero-copy buffers for performance and to prevent memory leaks 2019-05-01 21:11:09 +02:00