[mkgmap-dev] [PATCH v5]splitter memory usage

Thu Nov 17 22:17:02 GMT 2011


On 17.11.2011 22:38, GerdP wrote:
> Hello Felix,
>
> okay, thanks again for these numbers. Just one remark regarding speed:
> My profiling programs says that ~ 3% of the time is now spent in the
> routines that store the data (Node2AreaMap and below). So, I can't get this
> much better. Most of the time is spent reading and writing pbf and
> converting the data between pbf format and internal format.
So the biggest speedup would then be a faster HDD  or even better a SSD. 
Well maybe I try it out locally on my PC with SDD tomorrow (though my 
CPU is much slower, but nice to see where the bottleneck is)
>
> The speed difference between max-nodes 900000 and 1100000 probably comes
> from the different amount of data written to the pbf files. The smaller the
> areas, the more data is written to more than one output file, and that slows
> down processing.
Oh yes, that is well possible. Even more as I use --overlap=4000 
(instead of default 2000).