[self-interest] UI Performance Question

Michael Latta lattam at mac.com
Wed Jun 16 16:10:23 UTC 2004

While latency may be an issue I do not think that would be the issue 

1) The CPU usage is only about 2-5%.
2) My G4 does not have DDR memory.
3) My G5 has 4x the RAM of the G4 (4GB rather than 1GB).  So far more 
can be cached in ram.

Does this mean that Self has trouble making good use of L2 cache like 
most heap based memory models?

I got part way through instrumenting the time spent per frame and 1/3 
was in drawing and 2/3 in the activity related methods before that (in 
doStep).  I hope to get more detailed measurements later today when I 
try again.  I crashed the UI last time and need to start from scratch.

Do you know the latency issue is resolved in the Rev B units, or you 
are just saying that it is a known issue in Rev A?


On Jun 15, 2004, at 10:57 PM, Steve Dekorte wrote:

> On Jun 15, 2004, at 3:03 PM, Michael Latta wrote:
>> If I use 120 it starts to slow down, but anything less gets the same
>> 8-10 fps.  The times are very consistent between two very different
>> machines: 1Ghz G4 and 2.0 Ghz G5.
> Apple's first generation G5 has much higher latency memory than the G4,
> so I wouldn't expect Self to be much faster. When the G5 came out, I
> ran compile tests on a dual 2 Ghz G5 and they were no faster than on my
> dual 1.25 Ghz G4.
> -- Steve
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