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    <p>I understand (especially with the other comments about the
      functionality and having to wait for images to be retrieved from
      servers) what you guys are trying to achieve with this feature,
      but in my project the rasters I have loaded cover hundreds of
      square kilometres, and Qgis caches all of them, regardless of how
      far they are from the particular point where I am working on a
      map.</p>
    On 17/11/17 21:56, Alessandro Pasotti wrote:<br>
    <blockquote type="cite"
cite="mid:CAL5Q670oX6DM3ZyaCo_pCp8mOen+aD1GGdC9RExsinKdBeK4+A@mail.gmail.com">
      <div dir="ltr"><br>
        Maybe a crazy idea, but if this proves to be an issue, what
        about a monitoring process that prompts the user to disable this
        feature when memory goes over a certain threshold?<br>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Fri, Nov 17, 2017 at 8:21 AM,
          Patrick Dunford <span dir="ltr"><<a
              href="mailto:enzedrailmaps@gmail.com" target="_blank"
              moz-do-not-send="true">enzedrailmaps@gmail.com</a>></span>
          wrote:<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>Most of them are geoJpeg, there are a smaller number of
                geoTiff<br>
              </p>
              <div>
                <div class="h5"> <br>
                  <div class="m_5364448547456566204moz-cite-prefix">On
                    17/11/17 20:10, Matthias Kuhn wrote:<br>
                  </div>
                  <blockquote type="cite">
                    <p>Thanks, that's an interesting information.</p>
                    <p>What datatype are your rasters?<br>
                    </p>
                    <br>
                    <div class="m_5364448547456566204moz-cite-prefix">On
                      11/17/2017 03:53 AM, Patrick Dunford wrote:<br>
                    </div>
                    <blockquote type="cite">
                      <p>With the second command</p>
                      <p>iface.mapCanvas().<wbr>setPreviewJobsEnabled(False)</p>
                      <p>when I run that command it drops back to 16 GB<br>
                      </p>
                      <br>
                      <div class="m_5364448547456566204moz-cite-prefix">On
                        16/11/17 23:15, Matthias Kuhn wrote:<br>
                      </div>
                      <blockquote type="cite">
                        <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>
                        <p>Matthias<br>
                        </p>
                        <br>
                        <div
                          class="m_5364448547456566204moz-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_5364448547456566204moz-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_5364448547456566204moz-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_5364448547456566204Apple-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>
                                  <blockquote type="cite">
                                    <div><br
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                                      <span
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                                      <span
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                                  </blockquote>
                                </div>
                                <br>
                                <div>
                                  <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;font-weight:normal;letter-spacing:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;line-height:normal;text-align:center"><span>—</span></div>
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                                    <span
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id="m_5364448547456566204D186BD8A-F550-478C-AD02-19C4467B3C21"
                                                          src="cid:part6.325C554C.83621011@gmail.com"
                                                          class=""></span>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br
class="m_5364448547456566204Apple-interchange-newline">
                                                        <br
                                                          class="m_5364448547456566204Apple-interchange-newline">
                                                        <br>
                                                      </div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br>
                                                      </div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>Tim
                                                          Sutton</b></div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br>
                                                      </div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>Co-founder:</b><span
class="m_5364448547456566204Apple-converted-space"> </span>Kartoza</div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>Project
                                                          chair:</b><span
style="font-weight:normal"><span
                                                          class="m_5364448547456566204Apple-converted-space"> </span><a
href="http://QGIS.org" target="_blank" moz-do-not-send="true">QGIS.org</a></span></div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br>
                                                      </div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">Visit <a
href="http://kartoza.com/" target="_blank" moz-do-not-send="true"><span>http://kartoza.com</span></a> to
                                                        find out about
                                                        open source:</div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br>
                                                      </div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">Desktop
                                                        GIS programming
                                                        services</div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">Geospatial
                                                        web development</div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">GIS
                                                        Training</div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal">Consulting
                                                        Services</div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal;min-height:14px"><br>
                                                      </div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>Skype</b>:
                                                        timlinux </div>
                                                      <div
style="color:rgb(0,0,0);font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:center;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;font-variant-ligatures:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-variant-east-asian:normal;margin:0px;line-height:normal"><b>IRC:</b><span
class="m_5364448547456566204Apple-converted-space"> </span>timlinux on
                                                        #qgis at <a
                                                          href="http://freenode.net"
target="_blank" moz-do-not-send="true">freenode.net</a></div>
                                                    </span></span></span></span></span></span></span></span></span></div>
                                </div>
                                <br>
                              </blockquote>
                              <br>
                              <br>
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                                class="m_5364448547456566204mimeAttachmentHeader"></fieldset>
                              <br>
                              <pre>______________________________<wbr>_________________
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        <br>
        -- <br>
        <div class="gmail_signature" data-smartmail="gmail_signature">Alessandro
          Pasotti<br>
          w3:   <a href="http://www.itopen.it" target="_blank"
            moz-do-not-send="true">www.itopen.it</a></div>
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