The Firefox Profiler has been getting some new memory tooling support to help diagnose memory issues. In the past few weeks we have support for native (C++, Rust) memory allocation tracking. The new tooling works with the existing profiler UI, like the call tree, and flame graph. In addition, the memory stacks can be manipulated with call tree transforms. We have documentation outlining how this feature works and how to use it here:
https://profiler.firefox.com/docs/#/./memory-allocations Here is a snippet from the docs: > The profiler has experimental support for analyzing allocations in native > code (C++ and Rust) via stack sampling. These features require Nightly and > the new Profiler Toolbar Icon (directions below). > > The Native Allocations feature works by collecting the stack and size of > memory allocations from native (C++ or Rust) code. It does not collect > every allocation, but only samples a subset of them. The sampling is biased > towards larger allocations and larger frees. Larger allocations are more > likely show up in the profile, and will most likely be more representative > of the actual memory usage. Keep in mind that since these allocations are > only sampled, not all allocations will be recorded. This means that memory > track (the orange graph at the top) will most likely report different > numbers for memory usage. > We're planning some new features to more accurately track memory usage, as the current implementation has some limitations. These can be tracked in Bug 1564474. Please let us know if these features are helpful and how we can improve them for your workflows. Also let us know if they help you solve real memory issues. Example flame graph of loading DevTools: https://perfht.ml/36izsBC Example flame graph filtered to JavaScript stacks: https://perfht.ml/2BX0f8o Finally, special thanks to Nicholas Nethercote for his reviews on the platform changes here, and also for letting us steal a lot of his work and ideas from DMD. ~Greg Tatum and the Profiler Team _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
