>> Opening another hole of a couple machine instructions shouldn't make
>> much difference, although Py_MakePendingCalls should also be changed
>> then to reset ticker to 0 in its "early exit because the coincidences
>> I'm relying on haven't happened yet" cases.
Guido> OK, let's try it then.
You mean I just wasted my time running pystones? ;-)
Just the same, here's the output, after and before. For each setting, I ran
pystones twice manually, then the three reported times:
with patch:
Pystone(1.1) time for 50000 passes = 7.52
This machine benchmarks at 6648.94 pystones/second
Pystone(1.1) time for 50000 passes = 7.51
This machine benchmarks at 6657.79 pystones/second
Pystone(1.1) time for 50000 passes = 7.5
This machine benchmarks at 6666.67 pystones/second
without patch:
Pystone(1.1) time for 50000 passes = 7.69
This machine benchmarks at 6501.95 pystones/second
Pystone(1.1) time for 50000 passes = 7.68
This machine benchmarks at 6510.42 pystones/second
Pystone(1.1) time for 50000 passes = 7.67
This machine benchmarks at 6518.9 pystones/second
I was quite surprised at the difference. Someone definitely should check
this. The patch is at
http://python.org/sf/602191
My guess is that the code is avoiding a lot of pointer dereferences. Oh,
wait a minute. I muffed a bit. I initialized the ticker and checkinterval
variables to 100. Should have been 10.
... a short time passes while Skip thanks God he's not rebuilding VTK ...
With _Py_CheckInterval set to 10 it's still not too shabby:
Pystone(1.1) time for 50000 passes = 7.57
This machine benchmarks at 6605.02 pystones/second
Pystone(1.1) time for 50000 passes = 7.56
This machine benchmarks at 6613.76 pystones/second
Pystone(1.1) time for 50000 passes = 7.55
This machine benchmarks at 6622.52 pystones/second
This is still without Jeremy's suggested change.
apples-and-oranges-ly, y'rs,
Skip
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