69 lines
1.6 KiB
Markdown
69 lines
1.6 KiB
Markdown
# psutil vs os.cpu_count -- How many "CPUs" do I have?
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{:.no_toc}
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<nav markdown="1" class="toc-class">
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* TOC
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{:toc}
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</nav>
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## The goal
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How man "CPUs" do I have in this computer? We need this information for multi-processing.
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Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
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## os.cpu_count
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We get the core count inclusive the virtual [hyper threading](https://en.wikipedia.org/wiki/Hyper-threading) cores. But it is included in Python:
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```python
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import os
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# If -1 then it looks up the amount of available CPU HT cores
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number_of_cpu_processes: int = -1
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number_of_cpu_processes_temp = os.cpu_count()
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if number_of_cpu_processes < 1:
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if number_of_cpu_processes_temp is None:
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number_of_cpu_processes = 1
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else:
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number_of_cpu_processes = number_of_cpu_processes_temp
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print(number_of_cpu_processes) #-> 12 (for my computer)
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```
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## Alternative [psutil](https://github.com/giampaolo/psutil)
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```shell
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pip install psutil
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```
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[psutil](https://github.com/giampaolo/psutil): "Cross-platform lib for process and system monitoring in Python"
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I can deliver us more than just the CPU count:
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* CPU
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* Memory
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* Disks
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* Network
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* Sensors
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* Other system info
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* Process management
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* Further process APIs
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* Windows services
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```python
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import psutil
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number_of_cpu_processes: int = -1
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number_of_cpu_processes_no_ht: int = -1
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if number_of_cpu_processes == -1:
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number_of_cpu_processes = psutil.cpu_count()
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number_of_cpu_processes_no_ht = psutil.cpu_count(logical=False)
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print(number_of_cpu_processes) # -> 12 (for my computer)
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print(number_of_cpu_processes_no_ht) # -> 6 (for my computer)
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```
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