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

[Mats Wichmann]

On April 6, 2022 5:04:06 PM MDT, Bill Deegan <bill at baddogconsulting.com> wrote:
>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

Yup, we have talked about this. -j0 already went into the test runner, fwiw.
>
>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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>>


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