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 DEBIAN
critical
CRITICAL_ENTER(9) BSD Kernel Developer's Manual CRITICAL_ENTER(9)
NAME
critical_enter, critical_exit -- enter and exit a critical region
SYNOPSIS
#include <sys/param.h>
#include <sys/systm.h>
void
critical_enter(void);
void
critical_exit(void);
DESCRIPTION
These functions are used to prevent preemption in a critical region of code. All that is guaranteed is that the thread currently executing
on a CPU will not be preempted. Specifically, a thread in a critical region will not migrate to another CPU while it is in a critical
region. The current CPU may still trigger faults and exceptions during a critical section; however, these faults are usually fatal.
The critical_enter() and critical_exit() functions manage a per-thread counter to handle nested critical sections. If a thread is made
runnable that would normally preempt the current thread while the current thread is in a critical section, then the preemption will be
deferred until the current thread exits the outermost critical section.
Note that these functions are not required to provide any inter-CPU synchronization, data protection, or memory ordering guarantees and thus
should not be used to protect shared data structures.
These functions should be used with care as an infinite loop within a critical region will deadlock the CPU. Also, they should not be inter-
locked with operations on mutexes, sx locks, semaphores, or other synchronization primitives. One exception to this is that spin mutexes
include a critical section, so in certain cases critical sections may be interlocked with spin mutexes.
HISTORY
These functions were introduced in FreeBSD 5.0.
BSD
October 5, 2005 BSD