Lee wrote:
On 2/25/19, Paul B. Gallagher <[email protected]> wrote:
OK, so the workaround for the CPU cap is to use less CPU time?
I think the "CPU cap" you're seeing is a single logical CPU running
100% busy. If your system has four logical CPUs and one of them is
100% busy that'd be 25% overall cpu utilization. If you're on windows
10 you can check by
start / Windows System / Task Manager
click on the performance tab, then cpu
right click on the graph, change graph to, logical processors
The Task Manager is how I know how much CPU is being used, and even
though I didn't say so explicitly, I thought I implied that was my
theory too, that one CPU is maxed out. Looking at the performance tab on
my system, it already shows four separate graphs, one for each
processor. But they all seem to be busy at roughly equal levels, so
perhaps something else is going on.
And the way to do that is to reduce disk caching (which I'm
probably not doing since I have 5-6 GB of RAM free) by increasing
memory cache?
I think the suggestion is to reduce cpu usage by keeping more stuff
in memory & not wasting cpu cycles by sending stuff off to the disk
(either swap or cache) & then reading it back in.
I heard that, but I'm skeptical. I don't think my system is stalling due
to paging or caching to disk, but today's test will show whether Dirk's
right or wrong.
Another possible scenario (I thought we grew out of this decades ago) is
that the program doesn't know how to use all the available RAM, or
something is denying it access beyond its allocation. But that wouldn't
explain why the hangs occur when CPU usage reaches 25% and not when RAM
usage approaches 8 GB (which is when I'd expect disk thrashing to
start). In fact, in the four years I've had this system, I've never seen
CPU usage over about 26-27% no matter how hard I pushed it.
--
War doesn't determine who's right, just who's left.
--
Paul B. Gallagher
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