If you had a month to improve gcc build parallelization, where would you begin?

[Jeff Law]

On 04/03/2013 05:53 PM, Joern Rennecke wrote:
> Quoting David Fang <fang@csl.cornell.edu>:
>
>> Apart from parallelism, I wished the stage 2,3 compilations had a hook
>> for ccache-ing
>
> Even better would be distcc, i.e. distribute the new compilers
> around a cluster so you don't need to have all your cores and DIMMS
> on the same motherboard to harness hugely massive parallelization.
Using distcc and ccache is trivial; I spread my builds across ~20 
processors around the house...


CC=distcc
CXX=distcc g++
CC_FOR_BUILD=distcc
CXX_FOR_BUILD=distcc
STAGE_CC_WRAPPER=distcc
STAGE_CXX_WRAPPER=distcc

You can't use pump mode though, so we're probably leaving something on 
the table.

Using distcc & ccache will certainly expose things like the lack of 
parallel multilib builds, configury slowness, critical path uber-slow 
insn-* builds and the like.

jeff