Ren-Jye Yu (renjye++at++python.tamu.edu)
Tue, 9 Sep 1997 10:24:26 -0500
I am creating a pfPipeWindow with a size of 1280x1504. There are three
channels on it. I found that the drawing time for each channel is about 4.5 to
5.5 msec. The culling time for each channel is about 0.1 msec. The app time is
about 3.8 msec. If I add the time consumed in these stages, the total time is
not more than 22 msec. The Head Up Display subroutine takes about 14 msec. So
the overall time should be 36 msec. But the time to run the loop is about 43
msec to 57 msec. Do you have any idea where the difference in time is ?
Which memory does the frame buffer use (RAM)? Do you know any command
to check the usage of the RAM? I have 256M of RAM.
I used gr_osview and gr_top to check the usage of CPU. (I have only one
R4400 CPU) I found that my code used more than 70% of CPU. The rest of the CPU
is idle. Why does the code use only 70% or less of the CPU? Is this reduced CPU
usage related to the degradedation of the frame rate?
The machine that I use is Onyx RE2, 1 CPU, 256 RAM with MCO option.
Thanks.
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