Get CPU and RAM usage

Question

I need to get the ram memory and CPU usage during execution of a process (the process can run sometimes and over 30 minutes). I am able to get the free RAM but the CPU usage

Answer 1

There is nothing wrong with your values.

The reason you see differences with what task manager returns is that the "CPU usage" value is something computed for a given interval, i.e. between two NextValue() calls. If task manager "doesn't call its own NextValue" (if we simplify how it works) at the same time you do, you won't return the same results.

Imagine the following scenario:

Time 0: 0% actual CPU usage
Time 1: 50% actual CPU usage
Time 2: 70% actual CPU usage
Time 3: 2% actual CPU usage
Time 4: 100% actual CPU usage

• If you check the value between Time 1 and Time 3, you'll return something based on "50% and 2%".
• If task manager checks the value between Time 2 and Time 4, it'll return something different, i.e. a value based on "70% and 100%".

You could try to spawn multiple processes of your own application, you should also see different results.