System Monitor chews up to 20% of my CPU. It's really pretty I know,
but ...this renders it really useless.
This is either caused by (1) the math-algorithm to smooth the graphs, or
(2) the redrawing.
If (1), need to check if the entire curve is re-approximated each
redraw. if it is, that's VERY BAD. Only the new point should be
adjusted, thus: NewPoint = 0.2 * new_val + 0.8 * LastPoint, or
something. That's called an IIR filter if anyone's interested.
If (2), I suggest
a) changing the readout to hospital cardiograph style. (reading moves from
left to right, and wraps)
b) lower refresh rate to 5fps, draw a bunch of samples each time
c) if you _really_ want the whole thing to move, blank and repaint each point
rather than blanking the area and redrawing
This would be fastest, and smooths:
const WIDTH 500
int val[WIDTH];
int x = -1;
float y = 0;
void plot_new_point(int newVal)
{
x++;
if (x > graphWidth)
x = 0;
float y_old = y;
y = 0.8 * y_old + 0.2 * newVal;
SetPixel( x, val [x], BACKGROUND_COLOR );
val[x] = y;
SetPixel( x, val [x], LINE_COLOR );
}
Sorry can't implement. 1) I'm a noob. 2) RSI. 3) ToDo list spans till
xmas.
Sam/Ohmu
--
Excessive CPU usage by Gnome System Monitor
https://bugs.launchpad.net/bugs/93847
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Desktop Bugs, which is a bug assignee.
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