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<p>Hi</p>
<p>they are triggered by QgsMapCanvas (in the gui library), so I
would be very surprised if they were triggered on the server.</p>
<p>Matthias<br>
</p>
<br>
<div class="moz-cite-prefix">On 11/16/2017 02:29 PM, kimaidou wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMKXKO6uBapJrG--qKKcMDyzZ6uGnO3FqLRA+t0P5_xTG9TOkQ@mail.gmail.com">
<div dir="ltr">
<div>
<div>
<div>Hi,<br>
<br>
</div>
I was wondering if these preview jobs are enabled in QGIS
Server context, when requesting a GetMap from any client. I
am pretty sure the context of the preview jobs execution is
related to Desktop, but I would like to be sure.</div>
<div>Any hint on this ?</div>
<div><br>
</div>
Regards,<br>
</div>
Michaël<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2017-11-16 11:15 GMT+01:00 Matthias
Kuhn <span dir="ltr"><<a href="mailto:matthias@opengis.ch"
target="_blank" moz-do-not-send="true">matthias@opengis.ch</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>Hi Patrick,</p>
<p>Would be interesting to do this test with previews
enabled and disabled. Then we'll see if it's actually
the previews or some other mechanism that is causing
this.<br>
</p>
<p>IIRC only a composite image is saved in the preview
jobs and not each layer separately, but that's just what
I remember and not evidence based.<br>
</p>
<p> You can enable them in the python console with</p>
<p> iface.mapCanvas().<wbr>setPreviewJobsEnabled(True)</p>
<p>and disable with</p>
<p> iface.mapCanvas().<wbr>setPreviewJobsEnabled(False)</p>
<p>Thanks for a feedback</p>
<span class="HOEnZb"><font color="#888888">
<p>Matthias<br>
</p>
</font></span>
<div>
<div class="h5"> <br>
<div class="m_6208825008050013630moz-cite-prefix">On
11/16/2017 08:42 AM, Patrick Dunford wrote:<br>
</div>
<blockquote type="cite">
<p>In my current project using Qgis 2.99, turning
off the rasters uses 16 GB, turning them on uses
52 GB</p>
<p>I do not believe it is independent from the
number of layers that are being displayed.</p>
<p>Previous versions of the software did not cache
every single raster (the number of rasters
actually being displayed on the canvas at any one
time is a small fraction of the total number in
the project)</p>
On 16/11/17 20:11, Matthias Kuhn wrote:<br>
<blockquote type="cite">
<p>Hi Patrick,</p>
<p>This uses some memory (~ canvas width pixels *
canvas height pixels * 8 preview images * 32 bit
RGBA), so let's assume 50 MB to 100 MB.</p>
<p>This consumption is independent from the number
or type of layers.</p>
<p>Matthias<br>
</p>
<br>
<div class="m_6208825008050013630moz-cite-prefix">On
11/16/2017 08:02 AM, Patrick Dunford wrote:<br>
</div>
<blockquote type="cite">
<p>So to put it another way this is the reason
why Qgis wants to use a huge amount of memory
(40 GB) when I have a lot of raster images
loaded in the background. <br>
</p>
<br>
<div
class="m_6208825008050013630moz-cite-prefix">On
16/11/17 18:56, Tim Sutton wrote:<br>
</div>
<blockquote type="cite"> Hi<br>
<div><br>
<blockquote type="cite">
<div>On 16 Nov 2017, at 04:35, Patrick
Dunford <<a
href="mailto:enzedrailmaps@gmail.com"
target="_blank" moz-do-not-send="true">enzedrailmaps@gmail.com</a>>
wrote:</div>
<br
class="m_6208825008050013630Apple-interchange-newline">
<div>
<p style="white-space:pre-wrap;font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;background-color:rgb(255,255,255)">What is this "preview job" function?</p>
<br
style="font-family:Helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255)">
</div>
</blockquote>
<div><br>
</div>
<div>Its application logic to prefetch /
pre-render offscreen content in
anticipation of user panning the map.</div>
<div><br>
</div>
<div>Regards</div>
<div><br>
</div>
<div>Tim</div>
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Sutton</b></div>
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