[mkgmap-dev] [PATCH v9] make maps in parallel

Tue May 19 06:02:49 BST 2009

On Mon, 18 May 2009, Mark Burton wrote:

> How about this:
>
> 1 - with no option specified, the default number of jobs (aka threads)
> is 1.
>
> 2 - specifying --max-jobs without a value will maximise the number of
> jobs (i.e. create one thread per core).
>
> 3 - specifying --max-jobs=N will create N threads.
>
> Would that suit you?

This would be the best approach (and it's just like 'make -j'). Not 
everybody wants to clog their computer with a mkgmap run. If map 
generation really is time consuming it could also be done on one core in 
the background while the computer is responsive for other tasks. In 
addition, parallel mkgmap requires more memory which is not available on 
all computers. For instance the laptop I am writing this mail on has a 
dual core but only 1GB memory, that's scarce even for one mkgmap thread.

-Wolfgang