<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 09/02/2017 09:51, Santiago Vila
wrote:<br>
</div>
<blockquote
cite="mid:20170209095134.5txw3bz4gu5tbxw7@cantor.unex.es"
type="cite">
<pre wrap="">On Thu, Feb 09, 2017 at 09:28:45AM +0100, Ansgar Burchardt wrote:
</pre>
<blockquote type="cite">
<pre wrap="">On Thu, 2017-02-09 at 00:05 +0100, Santiago Vila wrote:
</pre>
<blockquote type="cite">
<pre wrap="">In either case I'm setting this to serious again because it makes
packages to fail on single-CPU systems, and having more than one CPU
is
definitely *not* part of the build-essential definition.
</pre>
</blockquote>
<br>
</blockquote>
<pre wrap="">for example, so it is something definitely useful, not comparable
with building in a path which includes spaces.
(For the record, I am paying for some of my autobuilders directly from my pocket)
Thanks.
</pre>
</blockquote>
<br>
Respectfully disagree here. I appreciate that you're paying for
autobuilders. While multi-cores<br>
is not a requirement for build-essential (though dh, etc now default
to parallel builds), running<br>
MPI on a single core is definitely an exception, and oversubscribing
is typically a user bug.<br>
<br>
We have had users waste thousands of euro in compute attempting to
run 10,000 core jobs<br>
on 1000 cores by mistake, and they are the target audience for this
change in default behaviour.<br>
<br>
For our particular case (building and testing on 1 core in Debian) I
recommend just setting<br>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<pre class="message">export OMPI_MCA_rmaps_base_oversubscribe=1</pre>
<br>
Regards<br>
Alastair<br>
<br>
<pre class="moz-signature" cols="72">--
Alastair McKinstry, <a class="moz-txt-link-rfc2396E" href="mailto:alastair@sceal.ie"><alastair@sceal.ie></a>, <a class="moz-txt-link-rfc2396E" href="mailto:mckinstry@debian.org"><mckinstry@debian.org></a>, <a class="moz-txt-link-freetext" href="https://diaspora.sceal.ie/u/amckinstry">https://diaspora.sceal.ie/u/amckinstry</a>
Commander Vimes didn’t like the phrase “The innocent have nothing to fear,”
believing the innocent had everything to fear, mostly from the guilty but in the longer term
even more from those who say things like “The innocent have nothing to fear.”
- Terry. Pratchett, Snuff</pre>
</body>
</html>