[Bug bootstrap/96794] New: --with-build-config=bootstrap-lto-lean with --enable-link-mutex leads to poor LTRANS utilization

[Jan Hubicka]

> As seen
> here:https://gist.githubusercontent.com/marxin/223890df4d8d8e490b6b2918b77dacad/raw/7e0363da60dcddbfde4ab68fa3be755515166297/gcc-10-with-zstd.svg
> 
> each blocking linking of a GCC front-end leads to a wasted jobserver worker.
Hmm, I am not sure how to interpret the graph. I can see that there is a
funny staircase of ltranses but how that relates to jobserver workers?
We limit makefile to link a binary at a time to avoid Richi's box getting
out of memory, right?

NUmber of partitions is currently 128 what is 100% of CPU usage for you?

Honza