Hi Hugo,
I'm not specifically adding an index. So if you are right, I'm not using
that.
Regards,
Raymond
On 30-07-15 09:10, Hugo Mercier wrote:
Hi Raymond,
On 29/07/2015 09:04, Raymond Nijssen wrote:
Dear developers, ;)
A plugin of mine imports data from a gml file into a memory layer. Works
fine for tiny gml files, but takes forever on huge ones. Sounds
plausible maybe, but the relation is not linear.
So I did did some tests and found out that reading and parsing the gml
and creating the features always goes at the same speed of about 400
features a second (fps). But when adding these to my memory layer, the
process slows down tremendously.
I output the fps for every 1000 features and it gave me this graph:
http://terglobo.nl/downloads/memory-layer-performance.png
At the end of the importing process I'm processing just 3 features per
second.
Is this expected behaviour? Is a memory layer not meant for something
like this? Or is this a bug?
In the source code I found that for every feature I add to a memory
layer the index is updated. Could that be inefficient?
If I am correct the spatial index is created only if you ask so (by
passing "index=yes"). Do you have the same results without spatial index ?
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