confusing output of "CPU Get RT Loads.vi"
Target material: cRIO-9068
LabVIEW edition development system complete 2014
I'm intrigued by the information provided by the 'Get CPU Loads.vi RT". I wrote a simple test program that I run in interactive mode on my RT goal to demonstrate the problem. See the screenshots in the attached PDF file.
Figure 1 illustrates a timed loop that runs all 500 msec, changing the State of a Boolean indicator and indicator panel update before "CPU load". Figure 2 shows the front panel. Observe that the field ' Total (%). "shows constantly around 17%. Why is this number so high when the program does almost nothing? Figures 3 and 4 see the similar results for a while loop with a waiting vi.
My real applications, which are much more complex than these test programs, are constantly indicating 100% CPU load. It's disturbing, but I don't know that I think that there is the light of the conclusions of my test program. Anyone can shed light on these results?
TIA
Hugh
It took me some time (I had accidentally unplugged the switch that connects my PC to my PXI - found just by tracing the Ethernet cable and ' Oh, I forgot that the switch... ") Who turned off the power to it? Oh, Yes, I remember that last week I forgot switch has been connected... ».
My PXI controller is a 8108, who has a dual core Pentium any in it. As a result, I get two reports of CPU, one for each carrot load. It is quite clear that the timed loop runs in Core 1 (as the time goes up because I increase the computation inside the loop).
As shown here, the Timed loop runs during three cycles to 0.5 Hz, trying to calculate random numbers 1 million (seems to take a fraction of a second, maybe 50 to 100 ms). Every half second, I have the CPU load in a separate loop. To ensure that at least one of the measures to obtain a complete cycle of the loop delay, I delay the start of the loop timed by 1/4 second.
Here is what I get on the fourth measure (the second to the fourth are similar).
You will notice that Core 1, which has the timed loop, is busy at 13% of the time, while the other loop is busy by 0.3%. Overlooking all 6 reading, Core 0 will never higher than 0.6%, while the Core 1 is either<1% or="" around="" 13%="" (recall="" that="" it="" might="" not="" be="" started,="" or="" may="" be="">1%>
I ran once more, reduce the number of random numbers by a factor of 100 (to 10,000). The first charges were 0.5% and 0.75% (initialization), the other was 1.6% and 3.4% (from timed loop) and the last four (when the timed loop was running) both hearts were 0.3% or less. So, in my hands, once the timed loop is running, I can 'measure' its basic with minimal impact loading.
Bob Schor
Tags: NI Software
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