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<p>Christophe,</p>
<p><span style="font-family:Symbol" lang="EN-US"><span
style="mso-list:Ignore"><span style="font:7.0pt "Times
New Roman""></span></span></span><span lang="EN-US">CPL_MULTIPROC_WIN32
is automatically set on Windows by
<a class="moz-txt-link-freetext" href="https://github.com/OSGeo/gdal/blob/104e1747748d204e8aff1945464a24b1f8c94c90/port/cpl_multiproc.h#L43">https://github.com/OSGeo/gdal/blob/104e1747748d204e8aff1945464a24b1f8c94c90/port/cpl_multiproc.h#L43</a></span></p>
<p><span lang="EN-US">Even<br>
</span></p>
<div class="moz-cite-prefix">Le 04/07/2022 à 11:57, DELEPINE
Christophe a écrit :<br>
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cite="mid:ca37465705e94466b796d86ae28bab47@thalesgroup.com">
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<p class="MsoNormal"><o:p> </o:p></p>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US">Hi Even<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US">I have looked at cpl_multiproc.cpp implementation and I believe that I cannot use multithreading for the mbtiles conversion (even if I define GDAL_NUM_THREADS)<o:p></o:p></span></pre>
<p class="MsoNormal"><span lang="EN-US">The compilation of
cpl_multiproc.cpp depends on several compilation flags :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-family:Symbol" lang="EN-US"><span
style="mso-list:Ignore">·<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">CPL_MULTIPROC_STUB<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-family:Symbol" lang="EN-US"><span
style="mso-list:Ignore">·<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">CPL_MULTIPROC_WIN32<o:p></o:p></span></p>
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style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-family:Symbol" lang="EN-US"><span
style="mso-list:Ignore">·<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">CPL_MULTIPROC_PTHREAD<o:p></o:p></span></p>
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style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-family:Symbol" lang="EN-US"><span
style="mso-list:Ignore">·<span style="font:7.0pt
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</span></span></span><!--[endif]--><span lang="EN-US">CPL_MULTIPROC_NONE<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If none of them is
defined, then CPL_MULTIPROC_STUB is defined automatically
which means that multithreading is disabled (thread creation
does not work).<o:p></o:p></span></p>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US">I am using windows binaries of gdal I get from this site : </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a href="https://www.gisinternals.com/release.php" moz-do-not-send="true"><span style="color:windowtext" lang="EN-US">GISInternals Support Site</span></a><o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US">It seems that none of these symbols have been defined for this build process<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US">I guess I would have to recompile gdal in order to enable multithreading…<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US">Regards<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US">Christophe<o:p></o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-US"><o:p> </o:p></span></pre>
<pre><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D" lang="EN-US"><o:p> </o:p></span></pre>
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My software is free, but my time generally not.</pre>
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