ROOT 6.34.00-rc1 is out!

Dear all,

We are proud to announce that the first candidate of release 6.34.00, 6.34.00-rc1, is out!

This is an opportunity to try out the new functionalities of the 6.34.00 development release, currently scheduled by the end of the month.
The new ROOT comes with many new features (see the preliminary release notes) as well as improved stability: more than 160 items in the ROOT trackers have been addressed for this release.

Some highlights:

  • RNTuple: that the first version of the RNTuple on-disk binary format was finalized. Future versions of ROOT will be able to read back RNTuple data written as of this release. Check out this talk at the CHEP 2024 conference to learn more about RNTuple, the new HEP data storage software technology!
  • RDataFrame: scaling on many cores was improved, memory usage significantly reduced. Moreover, the interface for distributed execution has been expanded for a more rewarding user experience.
  • RooFit: the power of automatic differentiation can be now transparently used thanks to CLAD - see this talk at the ICHEP 2024 conference.
  • Python interface: more stability and functionality, also thanks to the latest Cling C++ interpreter version, powered by LLVM 18.
  • Graphics: Javascript interactive visualisation is now the default for notebooks, moreover the web graphics functionality has been further expanded.
  • Build infrastructure: not a functionality per se, but a boost in stability. This release was integrated and tested on more than ten Linux flavours (on x86, ARM and NVidia GPUs), four types of Windows configurations as well as four macOS versions (yes, the Apple Beta was there too!)

Please note that 6.34 is a short term support release. As such, it is not meant to be used for data taking. It will be superseded by the 6.36 release, which is foreseen for the second quarter of 2025. Patch releases of 6.34 will be provided until June 30th 2025.

Best,
Danilo for the ROOT Project

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