Hi,
I have tested speed of random access to PostGIS features with simple
testing application.
// about 1e4 points
poLayer = poDS->GetLayerByName("bridges");
nfeatures = poLayer->GetFeatureCount();
for (int fid = 1; fid < nfeatures; fid++)
poFeature = poLayer->GetFeature(fid);
and sequential access
while(1) {
poFeature = poLayer->GetNextFeature();
if (!poFeature)
break;
}
I would expect that random access will be slower, anyway not so much.
random access
real 0m5.612s
user 0m1.432s
sys 0m0.512s
sequential access
real 0m0.248s
user 0m0.116s
sys 0m0.012s
Are there any possibilities how to speed up random access (not
speaking about sample application where should be used seq access).
Thanks in advance, Martin
--
Martin Landa <landa.martin gmail.com> * http://geo.fsv.cvut.cz/~landa
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