[Scons-users] Add `--parallel` option to automatically use all CPU threads

[Bill Deegan]

Greetings,

There's no need to add an additional option for this.
If you can programmatically detect the # of cores (in python), you can do
this in your own code via SetOption('num_jobs', NUMBER  HERE) and even
check if num_jobs is set to 1 which is the current default value and if so
then set it to the actual number of cores.

What might work as a SCons default behavior change though, is to have -j's
default value be 0 and if 0, use some logic to set based on # of available
cores.


-Bill

On Wed, Apr 6, 2022 at 3:29 PM Hugo Locurcio <hugo.locurcio at hugo.pro> wrote:

> Hello,
>
> This is a feature request for SCons to add a `--parallel` option, which
> would be equivalent to `-j` with the number of logical CPU cores present
> on the system. CMake provides a similar option, which is convenient to
> avoid juggling with non-portable lines that rely on shell extensions
> (and therefore don't always play well with IDE configuration).
>
> We recently encountered this issue while adding a CLion + SCons guide to
> the Godot documentation:
> https://github.com/godotengine/godot-docs/pull/5743
> Since CLion doesn't seem to expand command executions in its command
> lines, the current build commands given in the various Compiling pages
> don't work when used under CLion.
>
> Instead of using:
>
>      scons -j$(nproc)        # Linux
>
>      scons -j%NUMBER_OF_PROCESSORS%        # Windows (cmd)
>
>      scons -j$env:NUMBER_OF_PROCESSORS        # Windows (PowerShell)
>
>      scons -j$(sysctl -n hw.logicalcpu)        # macOS
>
>
> You could just use:
>
>      scons --parallel        # All platforms :)
>
>
> This new option would cover the 90% use case (that is, using all CPU
> threads to build a program) with an easy-to-remember command. This also
> happens to be the same switch as used by CMake.
>
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