<div dir="ltr"><div>Dear John,</div><div><br></div><div>I really appreciated the explanation of the m<span style="font-size:12.8000001907349px">ulti-threading. I tried with a smaller number of threads and it works like a charm. </span></div><div><br></div>Thanks very much John.<input name="virtru-metadata" type="hidden" value="{"email-policy":{"state":"closed","expirationUnit":"days","disableCopyPaste":false,"disablePrint":false,"disableForwarding":false,"expires":false},"attachments":{}}"><div><br></div><div>Mario Souto.</div></div><div class="gmail_extra"><br><div class="gmail_quote">2014-12-29 15:33 GMT-02:00 John Forrest <span dir="ltr"><<a href="mailto:john.forrest@fastercoin.com" target="_blank">john.forrest@fastercoin.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>Mario,<br>
<br>
Multi-threading comes in two flavours - opportunistic and
deterministic.<br>
<br>
Opportunistic is more efficient, but not exactly repeatable.<br>
<br>
The meaning of the parameter threads is -<br>
<br>
0 - off - running in serial mode<br>
n (1-reasonable) - opportunistic using n threads. With k cpus, I
would use k or maybe one more.<br>
n (101-) - deterministic using n-100 threads. With k cpus I would
use k or maybe up to 2*k as load balancing is worse.<br>
<br>
threads == 100 ! should be as 0, but somewhere a parallel flag has
been set and so things go wrong.<br>
<br>
Solution - don't use 100 - I will probably get round to treating
as 0.<br>
<br>
John Forrest <br><div><div class="h5">
On 29/12/14 16:36, Mario Souto wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div class="h5">
<div dir="ltr">Dear all,
<div><br>
</div>
<div>I am using the version 2.8.12 of Cbc and having some <span style="font-size:12.8000001907349px">strange</span> problem
with the Multithreading feature. The following problem is
'proven infeasible' when using 100 threads. However, an
integer solution cab be found when only one thread is used.</div>
<div><br>
</div>
<div>Does any one have some idea about it?<br>
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<div><br>
</div>
<div>
<div style="font-size:12.8000001907349px"><span style="font-size:12.8000001907349px">Thanks in advance,</span><br>
</div>
<div style="font-size:12.8000001907349px"><span style="font-size:12.8000001907349px"><br>
</span></div>
<div style="font-size:12.8000001907349px"><span style="font-size:12.8000001907349px">Mario Souto.</span></div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
<br>
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