Re: GCD killed my performance
Re: GCD killed my performance
- Subject: Re: GCD killed my performance
- From: Dave Fernandes <email@hidden>
- Date: Fri, 25 Apr 2014 01:26:56 -0400
Is there any way to batch up more work to do in each block? Then your ratio of real work to overhead would go up.
On Apr 25, 2014, at 12:35 AM, Jens Alfke <email@hidden> wrote:
>
> On Apr 24, 2014, at 9:04 PM, Dave Fernandes <email@hidden> wrote:
>
>> What’s the CPU utilization? Are you actually getting full use of them, or are your threads blocked waiting for something?
>
> Fairly high — I think 175% or so (out of 200% possible). The problem is that a large fraction of that is taken up with busywork. In the CPU profile list from Instruments, the top 25 or so stack frames are all system infrastructure; you have to read down quite a ways to find any application code at all.
>
> —Jens
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