Re: Threads, Sockets and OSX

Peter Hickman <[email protected]> wrote:
> I have a second Mac of lower spec and slightly older version of OSX (2 CPUs
> vs 4 CPUs, 10.13.6 vs 10.14.1), I'll check that out ...
> 
> It does the 100% usage followed by 0% usage that my main computer does but
> the 100% usage can last minutes rather than seconds and the 0% usage runs
> between 5 and 15 seconds. Overall it completes the test faster because it
> spends less time at 0% usage

Have you tried any profiling tools which can break down where the CPU usage
is coming from (and where the 0% usage is sleeping)?

I'm not familiar with OSX at all, but things like "perf" on
Linux or even iostat or looking at the right columns in "top"
can be helpful.

> One possible difference is that the main computer has a normal disk and the
> older machine has an SSD. I've been wondering if it's some OSX background
> task that is kicking and and slowing things down. If it was disk bound then
> the SSD would get past that bottleneck much faster (not to mention far
> fewer files on my second mac)

Something like "top" would be useful for checking background activity

> To test this thesis I would need to install an SSD in my main computer,
> which is very, very tempting :)

And do you know how disk/file-system intensive your application is?
I know Linux does filesystem caching pretty aggressively compared
to other OSes.

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