Yes, sorry, a couple of people pointed that out to me privately. And I
did get that mixed up; I was assuming processors, despite the page
specifically pointing out "physical cores".
I still think there's something to be kept in mind here, though. Even
with 4 processors (2 hyperthreaded cores or whatever), it's never
correct to assume that running something on a different thread is a gold
bullet for performance problems. I'm all for increasing the concurrency
of our code as long as we ensure that it doesn't hurt in the case of low
levels of actual parallelism.
What that means in practice, I'm not entirely sure, but it does seem
like we should be more conscious about thread priorities and global
thread pool management. Also, lock contention is a real thing. It has
been coming up here and there and wiping out parallelization gains.
On 3/28/18 10:27 AM, Ben Kelly wrote:
That page says "physical cores", so its not taking into account hyper
threading, right? So even a high end macbook pro falls in that category?
On Tue, Mar 27, 2018 at 5:02 PM, Mike Conley <mcon...@mozilla.com
<mailto:mcon...@mozilla.com>> wrote:
Thanks for drawing attention to this, sfink.
This is likely to become more important as we continue to scale up our
parallelization with content processes and threads.
On 21 March 2018 at 14:54, Steve Fink <sf...@mozilla.com
<mailto:sf...@mozilla.com>> wrote:
> Just to drive home a point, let's play a game.
>
> First, guesstimate what percentage of our users have systems
with 2 or
> fewer cores.
>
> Then visit
https://hardware.metrics.mozilla.com/#goto-cpu-and-memory
<https://hardware.metrics.mozilla.com/#goto-cpu-and-memory> to
> check your guess.
>
> (I didn't say it was a *fun* game.)
>
>
> _______________________________________________
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> dev-platform@lists.mozilla.org
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>
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