[OSM-dev] Memory error while converting osm to gml

Matt Amos zerebubuth at gmail.com
Sat Apr 4 19:28:14 BST 2009

2009/4/4 Martijn van Oosterhout <kleptog at gmail.com>:
> Just reading this again made me realise that we could probably make
> osm2pgsql faster for the common case just by forking and using
> gzip/bzip2 to do the decompression in a separate process (i.e. another
> CPU)... Not entirely sure how much you'd save though (ISTR someone
> saying it was the polygon construction that took a lot of time), but
> it'd surely help somewhat.

i found that using unix pipes (i.e: bzcat | osm2pgsql -) for this
didn't take any less time, probably because bzcat/osm2pgsql are both
using synchronous reads and writes. maybe if decompression was on a
different thread using a pair of synchronised buffers?



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