On the effect of branch mispredictions in the Squeak VM

John M McIntosh johnmci at mac.com
Mon Jul 7 22:43:07 UTC 2003


> Now that's interesting to see! It all looks as if the PPC is really  
> *much*
> less affected by branch prediction issues. BTW, the numbers you sent  
> around
> in the first message only said "using mac vm 3.5.2b1 (500Mhz G3) - were
> these taken from a gnuified VM? If not, could you run the two  
> benchmarks to
> see if they have any effect?

These numbers come from the 3.5.2b1 gnuified gcc 3.3 mac vm

> My numbers using mac vm 3.5.2b1 (500Mhz G3) are:
>
> 10	0	0
> 100	0	0
> 1000	1	1
> 10000	8	7
> 100000	77	78
> 1000000	797	781
> 10000000	7817	7861
>
> again
> 10	0	0
> 100	0	0
> 1000	1	1
> 10000	15	8
> 100000	78	77
> 1000000	786	776
> 10000000	7809	7819


The slower numbers come from the non-gunified 3.5.2b1 codewarrior os-9  
VM

--
======================================================================== 
===
John M. McIntosh <johnmci at smalltalkconsulting.com> 1-800-477-2659
Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com
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