Display Update Speed
Lex Spoon
lex at cc.gatech.edu
Wed Mar 22 17:14:54 UTC 2000
Okay, I was actually testing without -xshm. Here's a broader spread,
based on Bob Jarvis's code:
>> without -xshm:
>>
>> 32: 181 180 178 174
>> 16: 234 231 229 223
>> 8: 210 220 219 213
>>
>> with -xshm:
>>
>> 32: 179 72 70 152
>> 16: 126 126 128 134
>> 8: 125 112 115 111
So it's close to twice as fast with -xshm. But even so, it still takes
at least 100 ms in almost all combinations.
By the way, this is a 32-bit display (xdpyinfo says depth=24, bpp=32),
so that might explain why some people are getting faster results.
And incidentally, I just realized the VM I have doesn't work with -xshm
where Squeak and the display are both 32-bit. :( The screen just goes
black when I try it (so interpret the 32-bit numbers with -xshm with a
grain of salt :)). I have no idea if this has been fixed more recently,
and since I don't do much graphics stuff, I'm going to leave it alone
for now.
Lex
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