Jay Gischer (gischer++at++puget.engr.sgi.com)
Tue, 7 Apr 1998 10:09:23 -0700 (PDT)
->As it turns out, in perfly there are two contributions to the DRAW
->stage which are not measured by the perfly stats, pre-draw and
->post-draw.
I've since found out that this is not completely accurate. Pre-draw
time is measured and is represented by a dark line before the normal
line. Post-draw time is measured and is represented by a dark line
after the normal line.
The GUI redraw is done in a separate channel,
rather than in pre-draw, but the effect is the same... it appears as
the gap between the frame-synch vertical bar and the beginning of the
normal line.
The dotted line represents the time taken to draw stats.
One other contribution to draw time is system overhead. If you aren't
running as root with the DRAW process locked down to a processor, you
could easily be spending 1-2 ms in the OS handling interrupts, I/O,
and who knows what...
------------------------------------------------------------------------
Jay L Gischer + "I see great things in baseball. It's our game.
Advanced Graphics + It will repair our losses and be a blessing to
Software + us."
Silicon Graphics + -Walt Whitman
(415) 390-4277 +
gischer++at++sgi.com + "A life has no meaning except in the impact it
+ has on other lives"
+ -Jackie Robinson
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