> On Apr 21, 2017, at 3:57 AM, Pavol Vaskovic via swift-dev 
> <swift-dev@swift.org> wrote:
> 
> Hi swift-dev!  
> 
> I was working over the Easter holiday weekend on script that reports the 
> benchmark results comparison. I wasn’t always up-to-date with the master, but 
> I have noticed a mysterious change in MAX_RSS value reported from benchmarks. 
> The change went away again in later builds.
> 
> For example the AngryPhonebook benchmark usually reports MAX_RSS of 10 543 
> 104 - so around 10 MB. But my local builds from 2017-04-15 had all similar 
> tests drop to around 3 MB (AngryPhonebook reported 3 506 176).
> 
> That seems like a significant and positive change, but later builds returned 
> to previous values. I have tried to look through the commits around that 
> time, but nothing there strikes me as obvious cause.  
> 
> Forgive my cluelessness, I lack proper visibility into the projects current 
> development, but is there some work going on in this area, that got merged 
> and reverted?

The value of MAX_RSS depends on OS behavior. Other activity on the same machine 
may change MAX_RSS of the benchmark. The changes you saw might not be "real".

If you re-run the 2017-04-15 builds today, do you still see 3 MB instead of 10 
MB?


-- 
Greg Parker     gpar...@apple.com     Runtime Wrangler


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