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What does 'Handles' and 'Threads' mean in the Probe Health ?

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I found that 'Handles' and 'Threads' in Probe Health.

What does 'Handles' and 'Threads' mean in the Probe Health ? And What is the recommended range for stable operation? (Note that PRTG is running on Virtual machine with Windows 2016 Standard.)

handles health probe threads

Created on Dec 23, 2019 8:53:29 AM by  Jonathan_Jung (0) 1



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Dear Jonathan_Jung,

handles are integer numbers identifying an object (or more technically, an instance of a resource), a thread is a part of a multi-threaded process which is executed decoupled from other threads.

PRTG limits the threads per probe. A probe has only up to 500 threads for sensors scans, plus some additional threads for other work. The handle count is less critical, a process is technically allowed to use a couple of millions handles.

Created on Dec 23, 2019 2:50:46 PM by  Arne Seifert [Paessler Support]



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Thanks for your quick reply.

I have more questions about threads. Does that mean probe can only handle up to 500 threads at the same time? Does the probe have 500 sensor scans at a one interval ?

Created on Dec 24, 2019 12:12:25 AM by  Jonathan_Jung (0) 1



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Dear Jonathan_Jung,

the probe can only do up to 500 scans at the same time, since only up to 500 threads are used. The probe has a scheduler for scan requests and distributes those over the threadpool. Some sensor scans cannot be run at the same time, those use a "mutex" (mutual exclusion) which is recognized by the scheduler.

Created on Dec 25, 2019 5:03:06 PM by  Arne Seifert [Paessler Support]



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.