Before patches I gained about 5% by extrackting witz 7z unpacker on commandline, before running the splitter (however compiled 10 days ago, so excluding the lates changes).
2009/8/7 Clinton Gladstone <[email protected]> > On Fri, Aug 7, 2009 at 2:56 PM, Chris Miller<[email protected]> > wrote: > > > I've got 4 cores (8 with hyperthreading) so this is something I'm acutely > > aware of. Watching my PC churn away at only 12.5% CPU for a few hours > isn't > > my idea or resources well spent! Unfortunately there's no quick win > because > > the XML parsing is very linear, but I have already been considering > various > > options and certainly plan to give them a try at some point. I've got > quite > > a few other improvements planned that'll come first though. > > Just out of interest, what performance gains (or disadvantages) would > there be to working with uncompressed files, instead of bz2 and gz > files? > > Would this be faster for those of us with copious amounts of disk > space, or would the extra IO negate any CPU-related performance gains? > > I know that Osmosis performance on multi-core systems can apparently > be improved by piping the OSM file through a decompression program, > but I assume that would not be practical for Splitter which must make > several passes through the file. > > Cheers. > _______________________________________________ > mkgmap-dev mailing list > [email protected] > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev >
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