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

Mon May 18 12:56:44 BST 2009

Hi Greg,

> Is the default for your patch to not become parallel?  It seems that
> making mkgmap parallel is hard, and my personal utility function places
> correct behavior very high and speed not that much.  Until the code is
> really shaken out, I don't want to run parallel.  I don't know what
> others think, but just a thought.

At this time, it defaults to creating as many threads as there are
cores. I don't have a big issue with making the default number of
threads = 1 if that's what people want.

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?

Cheers,

Mark