Mold 2.31 Now ~10% Faster When Linking Very Large, Debug Info Enabled Binaries

[phoronix]

Phoronix: Mold 2.31 Now ~10% Faster When Linking Very Large, Debug Info Enabled Binaries

Rui Ueyama announced the release of Mold 2.31 today as the newest version of this high speed linker alternative to LLVM LLD and GNU Gold...

https://www.phoronix.com/news/Mold-2.31-Released

[edxposed]

With LTO, all this would be trivial, not to mention mold's lack of integration with LLVM (LLVM_TOOL_LLVM_DRIVER_BUILD).

[intelfx]

With LTO, all this would be trivial, not to mention mold's lack of integration with LLVM (LLVM_TOOL_LLVM_DRIVER_BUILD).

Yup, I've found that when LLVM LTO is used, lld is faster (compared to mold + LLVMgold.so) _and_ better, due to tighter integration with the rest of the LLVM stack.

For the GNU stack, though, mold is indeed the king.

[zboszor]

The new version should fix the Mesa Rusticl LTO build issue, too. Rusticl can be integrated into the CI, yay!

https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23775

[patrick1946]

With LTO, all this would be trivial, not to mention mold's lack of integration with LLVM (LLVM_TOOL_LLVM_DRIVER_BUILD).

LTO is really slow, not something you want for development.

[patrick1946]

Yup, I've found that when LLVM LTO is used, lld is faster (compared to mold + LLVMgold.so) _and_ better, due to tighter integration with the rest of the LLVM stack.

For the GNU stack, though, mold is indeed the king.

If you use LTO you are not really linking but compiling the code.

[edxposed]

LTO is really slow, not something you want for development.

This is not slower or even faster if you use thinlto cache.

[Vistaus]

Always great to see a new version of the fungal species.

[smitty3268]

With LTO, all this would be trivial, not to mention mold's lack of integration with LLVM (LLVM_TOOL_LLVM_DRIVER_BUILD).

I think Mold from the start was designed more with debugging in mind, rather than release builds. Stuff like LTO needs to work, in order to make sure you can do everything you might need to, but it's not really what the tool is intended to fix, which is speeding up debugging cycles on large projects.

[patrick1946]

This is not slower or even faster if you use thinlto cache.

You speaking about changing one translation unit or building everything from scratch?