02-24-2017
Determine threshold for CPU
I'm writing an application that should display whether a system is running “fine” (normal activity) or if it has reached a critical level and thus indicate through a graphical interface using a green-yellow-red color scheme. The server machines in question are running AIX (but it shouldn't differ much through various UNIX systems, though important to note it uses POWER). The solution will be applied on both single server machines with 100% (CPU) capacity and clusters which allow utilization of more than 100%.
I'm well aware that threshold like these are most commonly determined through a lot of trial & error and testing but I would like to come to a conclusion as to which would be the most appropriate threshold with some facts to back it up.
Which leads me to the following questions, how do I set these thresholds in a theoretical way? By thresholds I mean for example “should it turn red and alert with a critical warning at 90%, then how come?”, “Why not 85%?”.
There's also possible spikes in the CPU usage, so should it only indicate as critical after 2 minutes of usage above 85%?
My main question is: Are there any algorithms or past works that have done something similar? Any research papers or books that you know of? I've tried to research this a bit without much success, most of what I could find was related to the x86 architecture and not POWER. Even if the two architectures differ a bit, there's also many similarities so some methods may work with them both.
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LEARN ABOUT CENTOS
xchangepointercontrol
XChangePointerControl(3) XLIB FUNCTIONS XChangePointerControl(3)
NAME
XChangePointerControl, XGetPointerControl - control pointer
SYNTAX
int XChangePointerControl(Display *display, Bool do_accel, Bool do_threshold, int accel_numerator, int accel_denominator, int threshold);
int XGetPointerControl(Display *display, int *accel_numerator_return, int *accel_denominator_return, int *threshold_return);
ARGUMENTS
accel_denominator
Specifies the denominator for the acceleration multiplier.
accel_denominator_return
Returns the denominator for the acceleration multiplier.
accel_numerator
Specifies the numerator for the acceleration multiplier.
accel_numerator_return
Returns the numerator for the acceleration multiplier.
display Specifies the connection to the X server.
do_accel Specifies a Boolean value that controls whether the values for the accel_numerator or accel_denominator are used.
do_threshold
Specifies a Boolean value that controls whether the value for the threshold is used.
threshold Specifies the acceleration threshold.
threshold_return
Returns the acceleration threshold.
DESCRIPTION
The XChangePointerControl function defines how the pointing device moves. The acceleration, expressed as a fraction, is a multiplier for
movement. For example, specifying 3/1 means the pointer moves three times as fast as normal. The fraction may be rounded arbitrarily by
the X server. Acceleration only takes effect if the pointer moves more than threshold pixels at once and only applies to the amount beyond
the value in the threshold argument. Setting a value to -1 restores the default. The values of the do_accel and do_threshold arguments
must be True for the pointer values to be set, or the parameters are unchanged. Negative values (other than -1) generate a BadValue error,
as does a zero value for the accel_denominator argument.
XChangePointerControl can generate a BadValue error.
The XGetPointerControl function returns the pointer's current acceleration multiplier and acceleration threshold.
DIAGNOSTICS
BadValue Some numeric value falls outside the range of values accepted by the request. Unless a specific range is specified for an argu-
ment, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this
error.
SEE ALSO
Xlib - C Language X Interface
X Version 11 libX11 1.6.0 XChangePointerControl(3)