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<div class="moz-cite-prefix">Hello Clément,<br>
<br>
Le 18/10/2018 à 14:09, Clément DAVID a écrit :<br>
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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 style="mso-fareast-language:EN-US"
lang="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.</span></p>
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Do you think it would be complicated to continuously write the
serialized data on the disk ?
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="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
style="mso-fareast-language:EN-US" lang="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
style="mso-fareast-language:EN-US" lang="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
style="mso-fareast-language:EN-US" lang="EN-US">save
var2vec(list of
<u>syslins</u>): 0.014411<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="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 style="mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-US">Thanks,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-US">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="EN-US">Clément<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"
lang="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
<a class="moz-txt-link-rfc2396E" href="mailto:users-bounces@lists.scilab.org"><users-bounces@lists.scilab.org></a>
<b>On Behalf Of </b>Arvid Rosén<br>
<b>Sent:</b> Tuesday, October 16, <u>2018</u> 1:01 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:antoine.monmayrant@laas.fr">antoine.monmayrant@laas.fr</a>; Users mailing
list for Scilab <a class="moz-txt-link-rfc2396E" 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"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><b><span
style="font-size:12.0pt;color:black" lang="EN-US">From:
</span></b><span style="font-size:12.0pt;color:black"
lang="EN-US">users <<a
href="mailto:users-bounces@lists.scilab.org"
moz-do-not-send="true">users-bounces@lists.scilab.org</a>>
on behalf of "<a href="mailto:amonmayr@laas.fr"
moz-do-not-send="true">amonmayr@laas.fr</a>" <<a
href="mailto:amonmayr@laas.fr" moz-do-not-send="true">amonmayr@laas.fr</a>><br>
<b>Reply-To: </b>"<a
href="mailto:antoine.monmayrant@laas.fr"
moz-do-not-send="true">antoine.monmayrant@laas.fr</a>"
<<a href="mailto:antoine.monmayrant@laas.fr"
moz-do-not-send="true">antoine.monmayrant@laas.fr</a>>,
Users mailing list for Scilab <<a
href="mailto:users@lists.scilab.org"
moz-do-not-send="true">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"
moz-do-not-send="true">users@lists.scilab.org</a>" <<a
href="mailto:users@lists.scilab.org"
moz-do-not-send="true">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
style="font-size:13.5pt;font-family:-webkit-standard;color:black;background:white"
lang="SV">Couldn't you create your own atom package that
<u>restore</u> this raw memory dump for <u>scilab</u> 6.0?</span><span
style="font-family:-webkit-standard;color:black" lang="SV"><br>
</span><span
style="font-size:13.5pt;font-family:-webkit-standard;color:black;background:white"
lang="SV">I understand why we moved away from this model,
but it seems to be key for you.</span><span
style="font-family:-webkit-standard;color:black" lang="SV"><br>
</span><span
style="font-size:13.5pt;font-family:-webkit-standard;color:black;background:white"
lang="SV">There is always a trade-off between portability
(and robustness) and raw speed...</span><span
style="font-size:13.5pt;font-family:-webkit-standard;background:white"
lang="SV"><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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<pre class="moz-signature" cols="72">--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
<a class="moz-txt-link-freetext" href="http://www.utc.fr/~mottelet">http://www.utc.fr/~mottelet</a></pre>
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