dagar commented on issue #3455:
URL: 
https://github.com/apache/incubator-nuttx/issues/3455#issuecomment-814246623


   > From CI standpoint here are 73 build of NuttX (1.5M SLOC )including PX4 
(6M SLOC) in 12m 13s done as work flows
   > https://github.com/PX4/PX4-Autopilot/actions/runs/722727878
   
   Current PX4/NuttX is a bit more complex because the underlying NuttX build 
is still with Make, but PX4 parallelisms it per library (from cmake).
   
   The build history from my previous attempt 
(https://github.com/PX4/NuttX/pull/46) has been lost, but David captured some 
of the details in his presentation. 
https://nuttx.events/wp-content/uploads/2019/11/DSidrane_nx2019.pdf
   
   ![Screenshot from 2021-04-06 
12-02-52](https://user-images.githubusercontent.com/84712/113741850-0bc8b900-96d0-11eb-9020-7ec502b7b893.png)
   
   Those build machines were not very fast, but were still configuring + 
compiling NuttX configurations in 12-20 seconds. I vaguely recall the existing 
Makefile build system building the same configurations on that hardware was 
closer to 1-2 minutes per build.
   


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