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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">My 2cents, this is probably a poor man’s approach but Xcos offers vec2var / var2vec functions that encode in a double vector any Scilab datatypes passed as arguments. The encoding duplicates
the data in memory so there might be some overhead.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">On my machine, I have these timings using the attached script (Antoine’s one edited):<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="mso-fareast-language:EN-US">save
<u>list</u> of <u>syslins</u>: 1.361704<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="mso-fareast-language:EN-US">save
<u>list</u> of vec[]: 0.056788<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="mso-fareast-language:EN-US">save var2vec(list of
<u>syslins</u>): 0.014411<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Discarding hdf5 groups creation is a huge performance win but remove
<u>any way</u> to create clean hdf5 (eg. to address subgroups directly).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Thanks,
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">--<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Clément<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> users <users-bounces@lists.scilab.org>
<b>On Behalf Of </b>Arvid Rosén<br>
<b>Sent:</b> Tuesday, October 16, <u>2018</u> 1:01 PM<br>
<b>To:</b> antoine.monmayrant@laas.fr; Users mailing list for Scilab <users@lists.scilab.org><br>
<b>Subject:</b> Re: [Scilab-users] HDF5 save is super slow<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><b><span lang="EN-US" style="font-size:12.0pt;color:black">From:
</span></b><span lang="EN-US" style="font-size:12.0pt;color:black">users <<a href="mailto:users-bounces@lists.scilab.org">users-bounces@lists.scilab.org</a>> on behalf of "<a href="mailto:amonmayr@laas.fr">amonmayr@laas.fr</a>" <<a href="mailto:amonmayr@laas.fr">amonmayr@laas.fr</a>><br>
<b>Reply-To: </b>"<a href="mailto:antoine.monmayrant@laas.fr">antoine.monmayrant@laas.fr</a>" <<a href="mailto:antoine.monmayrant@laas.fr">antoine.monmayrant@laas.fr</a>>, Users mailing list for Scilab <<a href="mailto:users@lists.scilab.org">users@lists.scilab.org</a>><br>
<b>Date: </b>Tuesday, 16 October 2018 at 09:53<br>
<b>To: </b>"<a href="mailto:users@lists.scilab.org">users@lists.scilab.org</a>" <<a href="mailto:users@lists.scilab.org">users@lists.scilab.org</a>><br>
<b>Subject: </b>Re: [Scilab-users] HDF5 save is super slow<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span lang="SV" style="font-size:13.5pt;font-family:-webkit-standard;color:black;background:white">Couldn't you create your own atom package that
<u>restore</u> this raw memory dump for <u>scilab</u> 6.0?</span><span lang="SV" style="font-family:-webkit-standard;color:black"><br>
</span><span lang="SV" style="font-size:13.5pt;font-family:-webkit-standard;color:black;background:white">I understand why we moved away from this model, but it seems to be key for you.</span><span lang="SV" style="font-family:-webkit-standard;color:black"><br>
</span><span lang="SV" style="font-size:13.5pt;font-family:-webkit-standard;color:black;background:white">There is always a trade-off between portability (and robustness) and raw speed...</span><span lang="SV" style="font-size:13.5pt;font-family:-webkit-standard;background:white"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="SV"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Yeah, if that was possible, I would certainly do it. We already have a bunch of C/C++ binaries that we compile and link dynamically, but for that to be easy to implement, I guess the lists and structures need to be stored
linearly in one consecutive chunk of memory. I don’t know if that is the case. Anyone? C++ integrations and gateways are very poorly documented at the moment.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Otherwise, I would need to do some recursive implementation, that handles a bunch of different object types. Sounds painful.<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">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Arvid<o:p></o:p></span></p>
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