[concurrency-interest] For those of us who bench on Linux

Gregg Wonderly gergg at cox.net
Fri Apr 29 20:38:33 EDT 2016


There are so many pieces of the processor usability visible to software.  The optimizations that used to be simple are now very complex to get right.  It would be great to see the processors managing cores as virtual entities to do power management for us.

Gregg

Sent from my iPhone

> On Apr 27, 2016, at 3:50 AM, David Holmes <davidcholmes at aapt.net.au> wrote:
> 
> Very interesting. In particular that scheduling affinity (to take advantage of a warm cache) can be a performance hit.
>  
> Thanks for the link.
>  
> David
>  
> From: concurrency-interest-bounces at cs.oswego.edu [mailto:concurrency-interest-bounces at cs.oswego.edu] On Behalf Of Viktor Klang
> Sent: Wednesday, April 27, 2016 5:24 PM
> To: concurrency-interest <concurrency-interest at cs.oswego.edu>
> Subject: [concurrency-interest] For those of us who bench on Linux
>  
> TL;DR: problems found and fixed with Linux scheduler affecting multicore systems.
> 
> Story & paper: https://blog.acolyer.org/2016/04/26/the-linux-scheduler-a-decade-of-wasted-cores/
> 
> Code: https://github.com/jplozi/wastedcores
> 
> Would love to hear your thoughts.
> 
> -- 
> Cheers,
>> 
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