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Re: GCC Multi-Threading Ideas

On 1/23/20 12:19 PM, Nicholas Krause wrote:

On 1/23/20 3:39 AM, Allan Sandfeld Jensen wrote:
On Montag, 20. Januar 2020 20:26:46 CET Nicholas Krause wrote:
Greetings All,

Unfortunately due to me being rather busy with school and other things I
will not be able to post my article to the wiki for awhile. However
there is a  rough draft here:
Oxk/edit that may change a little for people to read in the meantime.

This comment might not be suited for your project, but now that I think about it: If we want to improve gcc toolchain buildspeed with better multithreading. I think the most sensible would be fixing up gold multithreading and enabling it by default. We already get most of the benefits of multicore architectures by running multiple compile jobs in parallel (yes, I know you are focusing on cases where that for some reason doesn't work, but it is still the case in most situations). The main bottleneck is linking. The code is even already there in gold and have been for years, it just haven't been deemed ready for
being enabled by default.

Is anyone even working on that?

Best regards
You would need both depending on the project, some are more compiler
bottle necked and others linker. I mentioned that issue at Cauldron as
the other side would be the linker.

Sorry for the second message Allan but make -j does not scale well beyond 4 or
8 threads and that's considering a 4 core or 8 machine. The problem has to
do with large build machines with CPUs with more cores than this or as is becoming
more common on mainstream systems.


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