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OK. That is how I've been using it. Wanted to make sure.
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<div class="">Thanks</div>
<div class="">Michael<br class="">
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____________________</div>
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<font face="Helvetica" size="3" class="">C. Michael Barton</font></div>
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<font face="Helvetica" size="3" class="">Director, Center for Social Dynamics & Complexity </font></div>
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<font face="Helvetica" size="3" class="">Professor of Anthropology, School of Human Evolution & Social Change</font></div>
<div class=""><font face="Helvetica" size="3" class="">Head, Graduate Faculty in Complex Adaptive Systems Science</font></div>
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<font face="Helvetica" size="3" class="">Arizona State University</font></div>
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<br class="">
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<font face="Helvetica" size="3" class=""><font class="">voice: </font><font class="">480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)</font><br class="">
<font class="">fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)</font><br class="">
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<font face="Helvetica" size="3" class="">www: <a href="http://www.public.asu.edu/~cmbarton" class="">
http://www.public.asu.edu/~cmbarton</a>, <a href="http://csdc.asu.edu" class="">http://csdc.asu.edu</a></font></div>
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<div class="">On Mar 16, 2019, at 11:58 AM, Moritz Lennert <<a href="mailto:mlennert@club.worldonline.be" class="">mlennert@club.worldonline.be</a>> wrote:</div>
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<div class=""><span style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Le
Fri, 15 Mar 2019 13:15:16 +0000,</span><br style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Michael
Barton <</span><a href="mailto:Michael.Barton@asu.edu" style="font-family: Monaco; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">Michael.Barton@asu.edu</a><span style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">>
a écrit :</span><br style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
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I've been using *.mapcalc_start to do some simple parallel processing<br class="">
in the i.pansharpen module and in r.landscape.evol. My understanding<br class="">
previously has been that *.mapcalc_start returns a Popen object that<br class="">
can be directed to wait to finish (like *.start_command), allowing<br class="">
multiple mapcalc operations to be initiated on multiple cores.<br class="">
<br class="">
But when running r.landscape.evol on another computer, it is acting<br class="">
like mapcalc is not waiting to finish in spite of the *.wait()<br class="">
commands.<br class="">
<br class="">
The description in the programmer's manual is not clear to me on this<br class="">
(see below). In one place, it says it does not wait to finish and in<br class="">
the example it says it does wait.<br class="">
</blockquote>
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<br style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">AFAIU,
the function mapcalc_start() does not wait, i.e. you can go on</span><br style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">with
your program while the mapcalc call is still ongoing. If you want</span><br style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">to
wait, you have to explicitely call the function wait() of the Popen</span><br style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">object
as is done in the example.</span><br style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<br style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<span style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Moritz</span><br style="caret-color: rgb(0, 0, 0); font-family: Monaco; font-size: 13px; 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; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
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<br class="">
Can anyone clarify this?<br class="">
<br class="">
Thanks<br class="">
Michael<br class="">
<br class="">
==== from programmer's manual ====<br class="">
<br class="">
script.raster.mapcalc_start(exp, quiet=False, verbose=False,<br class="">
overwrite=False, seed=None, env=None, **kwargs)[source] Interface to<br class="">
r.mapcalc, doesn’t wait for it to finish, returns Popen object.<br class="">
<br class="">
<blockquote type="cite" class="">
<blockquote type="cite" class="">
<blockquote type="cite" class="">output = 'newele'<br class="">
input = 'elevation'<br class="">
expr1 = '"%s" = "%s" * 10' % (output, input)<br class="">
expr2 = '...' # etc.<br class="">
# launch the jobs:<br class="">
p1 = mapcalc_start(expr1)<br class="">
p2 = mapcalc_start(expr2) <br class="">
</blockquote>
</blockquote>
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...<br class="">
<blockquote type="cite" class="">
<blockquote type="cite" class="">
<blockquote type="cite" class=""># wait for them to finish:<br class="">
p1.wait() <br class="">
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0<br class="">
<blockquote type="cite" class="">
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<blockquote type="cite" class="">p2.wait() <br class="">
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1<br class="">
____________________<br class="">
C. Michael Barton<br class="">
Director, Center for Social Dynamics & Complexity<br class="">
Professor of Anthropology, School of Human Evolution & Social Change<br class="">
Head, Graduate Faculty in Complex Adaptive Systems Science<br class="">
Arizona State University<br class="">
<br class="">
voice: 480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)<br class="">
fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)<br class="">
www:<span class="Apple-converted-space"> </span><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.public.asu.edu_-7Ecmbarton&d=DwIFaQ&c=l45AxH-kUV29SRQusp9vYR0n1GycN4_2jInuKy6zbqQ&r=lk-7X7CEOMDN8GaGVhiDsuO6gEp1wbG6nfT1XEEEtR0&m=SMauS2VJMEiccsq53CfPMfOU38B8lsDVCAd7oYqvLoc&s=eKrRsY0uJUc5RU5WldLfYR1EFjS1oSvI46U21M3qS4U&e=" class="">https://urldefense.proofpoint.com/v2/url?u=http-3A__www.public.asu.edu_-7Ecmbarton&d=DwIFaQ&c=l45AxH-kUV29SRQusp9vYR0n1GycN4_2jInuKy6zbqQ&r=lk-7X7CEOMDN8GaGVhiDsuO6gEp1wbG6nfT1XEEEtR0&m=SMauS2VJMEiccsq53CfPMfOU38B8lsDVCAd7oYqvLoc&s=eKrRsY0uJUc5RU5WldLfYR1EFjS1oSvI46U21M3qS4U&e=</a>,<span class="Apple-converted-space"> </span><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__csdc.asu.edu&d=DwIFaQ&c=l45AxH-kUV29SRQusp9vYR0n1GycN4_2jInuKy6zbqQ&r=lk-7X7CEOMDN8GaGVhiDsuO6gEp1wbG6nfT1XEEEtR0&m=SMauS2VJMEiccsq53CfPMfOU38B8lsDVCAd7oYqvLoc&s=lOB9PM_7bO9sn7VRqX3ZH1gFKM7lufgKzh50Yo2au7M&e=" class="">https://urldefense.proofpoint.com/v2/url?u=http-3A__csdc.asu.edu&d=DwIFaQ&c=l45AxH-kUV29SRQusp9vYR0n1GycN4_2jInuKy6zbqQ&r=lk-7X7CEOMDN8GaGVhiDsuO6gEp1wbG6nfT1XEEEtR0&m=SMauS2VJMEiccsq53CfPMfOU38B8lsDVCAd7oYqvLoc&s=lOB9PM_7bO9sn7VRqX3ZH1gFKM7lufgKzh50Yo2au7M&e=</a></blockquote>
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