[mkgmap-dev] [PATCH v1] make maps in parallel

Mon May 11 17:52:53 BST 2009

I used this patch on my 3core machine. I got about 75% improvement 
(using 2/3 cores instead of 1/3 without patch). No problems so would be 
great to integrate this into main branch (with switch to enable it).

Mark Burton wrote:
> FYI - a further test on the big box with all 16 cores in use showed a
> speedup of 600% when processing a tiled map using 8 threads. I was
> using a VM size of 1GB (not huge).
>
> Choosing the number of threads to be 1/2 of the available cores appears to make
> sense as the Java VM does use spare cores for other stuff (e.g. GC).
>
> Cheers,
>
> Mark
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