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).<br><br><div class="gmail_quote">2009/8/7 Clinton Gladstone <span dir="ltr"><<a href="mailto:clinton.gladstone@googlemail.com">clinton.gladstone@googlemail.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">On Fri, Aug 7, 2009 at 2:56 PM, Chris Miller<<a href="mailto:chris.miller@kbcfp.com">chris.miller@kbcfp.com</a>> wrote:<br>
<br>
> I've got 4 cores (8 with hyperthreading) so this is something I'm acutely<br>
> aware of. Watching my PC churn away at only 12.5% CPU for a few hours isn't<br>
> my idea or resources well spent! Unfortunately there's no quick win because<br>
> the XML parsing is very linear, but I have already been considering various<br>
> options and certainly plan to give them a try at some point. I've got quite<br>
> a few other improvements planned that'll come first though.<br>
<br>
</div>Just out of interest, what performance gains (or disadvantages) would<br>
there be to working with uncompressed files, instead of bz2 and gz<br>
files?<br>
<br>
Would this be faster for those of us with copious amounts of disk<br>
space, or would the extra IO negate any CPU-related performance gains?<br>
<br>
I know that Osmosis performance on multi-core systems can apparently<br>
be improved by piping the OSM file through a decompression program,<br>
but I assume that would not be practical for Splitter which must make<br>
several passes through the file.<br>
<br>
Cheers.<br>
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