Could you provide an explanation of the difference between Spotlight on UNIX vs Fog5 "Hosts Table:Monitored Hosts Only"?
Referenced attached screenshots.
1) Spotlight indicates 81% (equates to physical memory used) in where the F5 dashboard indicates 65%.
Spotlight is showing "Virtual Memory" and the equivalent Foglight component shows Physical memory.
The only memory values that seem to correlate are the paging vs swap when comparing.
2) Also, how do these two metrics which appear to be simliar, correlate?
Spotlight paging cpu 91,474
Foglight to cpu context switches 14,778
1) Spotlight indicates total free RAM is 1.61gb of 23.5 or 68% used. Foglight's dashboard illustrates 65% used.
The variance of 3% between the two is due to polling frequencies & data rollup in Foglight where Spotlight is real-time.
2) The CPU values you're attempting to correlate are not related.
The Spotlight Paging 91k value is the 'pages in'.
The Foglight 'context' cpu 14,778 value is a context switch of the CPU.
Monitoring Context Switches
A context switch occurs when the kernel switches the processor from one thread to another; for example, when a thread with a higher priority than the running thread becomes ready. Context switching activity is important for several reasons. A program that monopolizes the processor lowers the rate of context switches because it does not allow much processor time for the other processes' threads. A high rate of context switching means that the processor is being shared repeatedly; for example, by many threads of equal priority. A high context-switch rate often indicates that there are too many threads competing for the processors on the system.