Linking is the slowest part of D's compilation process– can we use mold to speed it up?
jamtlu at gmail.com
Tue Feb 23 14:41:59 UTC 2021
Linking is the slowest part of D's compilation process. It is
what makes its compilation speed uncompetitive with interrpreted
This project to make a faster linker is in alpha:
> Concretely speaking, I wanted to use the linker to link a
> Chromium executable with full debug info (~2 GiB in size) just
> in 1 second. LLVM's lld, the fastest open-source linker which I
> originally created a few years ago, takes about 12 seconds to
> link Chromium on my machine. So the goal is 12x performance
> bump over lld. Compared to GNU gold, it's more than 50x.
> It looks like mold has achieved the goal. It can link Chromium
> in 2 seconds with 8-cores/16-threads, and if I enable the
> preloading feature (I'll explain it later), the latency of the
> linker for an interactive use is less than 900 milliseconds. It
> is actualy faster than cat.
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