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