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<div>Tim,</div>
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<div>Thanks. Following your suggestions/example I was able to massage my own code to do what I need now. It took a couple of days working with Swift/T but the whole data-flow mindset has now kicked in and briefly banished the typical sequential instruction
thinking. It all makes sense now.</div>
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<div>Cheers.</div>
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<p style="font-size: 12px; margin: 0px; font-family: Verdana;">---</p>
<p style="margin: 0px; font-family: Verdana;"><span style="font-size: 10px;"><b>Timothy Stitt PhD</b> / Head of Scientific Computing</span></p>
<p style="margin: 0px; font-family: Verdana;"><span style="font-size: 10px;">The Genome Analysis Centre (TGAC)</span></p>
<p style="margin: 0px; font-family: Verdana; color: rgb(4, 46, 238);"><span style="text-decoration: underline; font-size: 10px;"><a href="http://www.tgac.ac.uk/">http://www.tgac.ac.uk/</a></span></p>
<p style="margin: 0px; font-family: Cambria; min-height: 19px;"><span style="font-size: 10px;"><br>
</span></p>
<p style="margin: 0px; font-family: Verdana;"><span style="font-size: 10px;">p: +44 1603 450378</span></p>
<p style="margin: 0px; font-family: Verdana; color: rgb(13, 102, 213);"><span style="color: rgb(0, 0, 0); font-size: 10px;">e: <a href="mailto:timothy.stitt@tgac.ac.uk">timothy.stitt@tgac.ac.uk</a></span></p>
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<span style="font-weight:bold">From: </span>Tim Armstrong <<a href="mailto:tim.g.armstrong@gmail.com">tim.g.armstrong@gmail.com</a>><br>
<span style="font-weight:bold">Date: </span>Tuesday, 17 March 2015 21:20<br>
<span style="font-weight:bold">To: </span>Timothy Stitt <<a href="mailto:timothy.stitt@tgac.ac.uk">timothy.stitt@tgac.ac.uk</a>><br>
<span style="font-weight:bold">Cc: </span>"<a href="mailto:exm-user@lists.mcs.anl.gov">exm-user@lists.mcs.anl.gov</a>" <<a href="mailto:exm-user@lists.mcs.anl.gov">exm-user@lists.mcs.anl.gov</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [ExM Users] Implicit blocking on foreach construct?<br>
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<div>Hi Tim,<br>
It's possible if you reformulate the problem in terms of data flow- there's no direct way in Swift to ask "is the loop finished" - but there is a way to ask "is the data being computed by the loop finished".<br>
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The "wait" construct - it lets you execute a block of code after a bit of data is assigned.<br>
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E.g. a trivial example is<br>
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<span style="font-family: monospace, monospace;">int x = do_some_computation();<br>
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<span style="font-family: monospace, monospace;">wait (x) {<br>
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<span style="font-family: monospace, monospace;"> trace("x is done!");<br>
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<div><span style="font-family: monospace, monospace;">}</span><br>
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<div>If you're building an array of files or similar, it's a little more complicated:<br>
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<span style="font-family: monospace, monospace;">import io;<br>
import files;<br>
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file x[];<br>
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wait deep (x) {<br>
trace("Done");<br>
}<br>
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foreach i in [1:10] {<br>
file tmp<"/tmp/swift-tmp-" + i + ".txt">;<br>
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tmp = write("");<br>
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x[i] = tmp;<br>
}</span><br>
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<div>This only prints "Done" once all of the files have been written. The wait deep ensures that everything in the array is completely built.
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<div>I'm also not sure about your use case, but Swift has some built-in support for generating temporary files - Justin Wozniak was recently working on improving that.<br>
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<div>- Tim<br>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On 17 March 2015 at 15:08, Timothy Stitt (TGAC) <span dir="ltr">
<<a href="mailto:Timothy.Stitt@tgac.ac.uk" target="_blank">Timothy.Stitt@tgac.ac.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Hi all,</div>
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<div>Is there a way to add explicit blocking to the end of the foreach construct? I have the following logic which doesn't work right now as the delete_files() routine is assumed to be concurrent with the foreach block when I want it to execute after the foreach
block is completed for all workers:</div>
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<div>foreach { do some work creating temp files}</div>
<div>delete_files() // delete temp files using an app function</div>
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<div>Thanks,</div>
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<div>Tim.</div>
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<p style="font-size:12px;margin:0px;font-family:Verdana">---</p>
<p style="margin:0px;font-family:Verdana"><span style="font-size:10px"><b>Timothy Stitt PhD</b> / Head of Scientific Computing</span></p>
<p style="margin:0px;font-family:Verdana"><span style="font-size:10px">The Genome Analysis Centre (TGAC)</span></p>
<p style="margin:0px;font-family:Verdana;color:rgb(4,46,238)"><span style="text-decoration:underline;font-size:10px"><a href="http://www.tgac.ac.uk/" target="_blank">http://www.tgac.ac.uk/</a></span></p>
<p style="margin:0px;font-family:Cambria;min-height:19px"><span style="font-size:10px"><br>
</span></p>
<p style="margin:0px;font-family:Verdana"><span style="font-size:10px">p: <a href="tel:%2B44%201603%20450378" value="+441603450378" target="_blank">
+44 1603 450378</a></span></p>
<p style="margin:0px;font-family:Verdana;color:rgb(13,102,213)"><span style="color:rgb(0,0,0);font-size:10px">e: <a href="mailto:timothy.stitt@tgac.ac.uk" target="_blank">timothy.stitt@tgac.ac.uk</a></span></p>
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