Hi,
> You should set the other new read optimisation flags here -- see
https://github.com/qgis/QGIS/blob/88ebb3f2f513dbce5a775f50e51ea0117f859c65/src/core/qgis.h#L1962
These are already available also in 3.24 and we use the
`TrustLayerMetadata` in the above test. For server, the other flags are
not applicable (Getprint requests need print layouts ).
So that mean we are comparing 3.24 to 3.26 with same level of read
optimisation and that does not change the fact that, for that very same
level of read optimisation, project's loading is incredibly slower in 3.26.
Le 20/06/2022 à 15:10, Nyall Dawson a écrit :
On Mon, 20 June 2022, 9:37 pm David Marteau via QGIS-Developer,
<qgis-developer@lists.osgeo.org> wrote:
Hi,
I have noticed a huge drop of performance while testing Qgis
server with Qgis 3.26, from 10x to 30x slower as usual.
Trying to reduce the problem I have found a huge increase of time
spend reading the project in 3.26 compared to 3.24.
Here some benchmark with very simple project from the test data
set. Note: the project has been updated with qgis 3.26:
Qgis 3.24:
======
readflags = QgsProject.ReadFlags()readflags |=
QgsProject.FlagTrustLayerMetadata
prj = QgsProject()
%timeit -n 1 prj.read(f"{datapath}/france_parts.qgs",readflags)
> 15.7 ms ± 205 µs per loop (mean ± std. dev. of 7 runs, 1 loop each)
Qgis 3.26:
======
readflags = QgsProject.ReadFlags() readflags |=
QgsProject.FlagTrustLayerMetadata
You should set the other new read optimisation flags here -- see
https://github.com/qgis/QGIS/blob/88ebb3f2f513dbce5a775f50e51ea0117f859c65/src/core/qgis.h#L1962
Nyall
prj = QgsProject()
%timeit -n 1 prj.read(f"{datapath}/france_parts.qgs",readflags)
195 ms ± 44 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
There is a factor x10 between Qgis 3.24 et Qgis 3.26 for the exact
same project.
This has serious impact on requests: landing page catalog request
time increased from approximatevely 110ms to more than 3.0s with
our test data set.
David Marteau
www.3liz.com <http://www.3liz.com>
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