[cfe-dev] [LLVMdev] 2 experimental projects

Mike Stump mrs at apple.com
Wed Mar 19 18:42:57 PDT 2008

On Mar 19, 2008, at 1:38 PM, Gabor Greif wrote:
> My measurements on a 4-processor machine have
> shown test time reduction of 60% when the tests were
> invoked as "make test -j8".

My testing shows that -j4 is the sweet spot on my MacPro with 4 CPUs  
for cfe.

   17.334 --> 7.681

Nice, thanks.  Anyway, := evaluates the variable once, = merely  
substitutes it, causing it to be run multiple times.  With the below  
patch we go from 4 evaluations to 2.

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