Skip to contents

Changelog

Source: NEWS.md

pjrt 0.3.0

Features

  • Added buffer_copy() function to copy buffer between devices.
  • New pjrt_register_custom_call() allows external packages to register C/C++ XLA FFI handlers with the PJRT plugin. Registration is deferred until the plugin loads, so handlers can be registered during .onLoad().
  • pjrt_device() now returns cached PJRTDevice instances, so repeated calls for the same device yield objects with stable identity (useful for hashing and caching, e.g. in {anvil}’s JIT).

Bug fixes

  • The configure script now uses the protoc compiler from the same installation as the linked protobuf library, preventing version mismatches when multiple protobuf versions are installed.
  • Compiling a program for a specific CPU device (e.g. cpu:1) now targets that device instead of silently falling back to cpu:0.
  • Fixed device targeting when compiling against a distributed PJRT client, where global device IDs and local hardware ordinals diverge.

Error messages

  • Improved error message when attempting to use CUDA on unsupported OS or platform.

pjrt 0.2.0

Asynchronous API

Operations such as host <-> device transfers and program execution were previously only synchronous. Now, they are asynchronous which has considerable performance benefits, especially on GPU. Specifically:

  • pjrt_buffer() and pjrt_execute() return immediately, but the returned buffer is not necessarily ready. To await a transfer or computation of a buffer, use await(). However, this is handled within PJRT, so this function never has to be called by a user.
  • as_array() is still synchronous, but there is now the asynchronous version as_array_async() but this is rarely needed. If used, it returns a PJRTArrayPromise object which can be converted to an R array/vector via value().
  • To check whether a PJRTBuffer or PJRTArrayPromise is ready, use is_ready().

Features

  • Added dtype support for PJRTBuffers via the tengen::dtype S3 generic. "bool" is now accepted as an alias for "i1"/"pred".
  • Accept DataType objects in the dtype parameter of pjrt_buffer().
  • Support device argument in pjrt_compile().

Bug fixes

  • Protect from segfaults in raw to buffer conversion.
  • Protect from segfault during device mismatch in pjrt_execute().

Platforms & Installation

  • Added support for Linux ARM (aarch64) using CPU backend.
  • Simplified CUDA installation via the cuda12.8 package, which now only requires compatible drivers to be installed.

Miscellaneous

  • The printer for PJRTBuffer now uses "bool" instead of "pred" to avoid discrepancies with {anvil}.

pjrt 0.1.1

Bug fixes

  • Fix formatting of +-Inf/NaN for f64

pjrt 0.1.0

  • Initial release