<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ken/Utkarsh,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If I remember correctly, a great deal of work was put into VisIt regarding stream tracer scaling. Any idea how successful they were, and if we could use some
of the same ideas?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Alan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> ParaView [mailto:paraview-bounces@paraview.org]
<b>On Behalf Of </b>Andy Bauer<br>
<b>Sent:</b> Friday, April 18, 2014 8:40 AM<br>
<b>To:</b> paraview@paraview.org<br>
<b>Subject:</b> [EXTERNAL] [Paraview] Fwd: Stream Tracer Scaling<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Amir,<br>
<br>
Please keep the discussion on the mailing list so that everyone that wants to can participate.<o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt">You could potentially do the smaller velocity data set in serial and the larger data set in parallel but would probably take a bit of extra work with Python. From the Python shell you have access to the AlltoN
filter which can create a copy of the data set on a reduced amount of processes.
<o:p></o:p></p>
</div>
<p class="MsoNormal">Regards,<br>
Andy<o:p></o:p></p>
<div>
<div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">---------- Forwarded message ----------<br>
From: <b>Amir A</b> <<a href="mailto:amiramir12345@outlook.com">amiramir12345@outlook.com</a>><br>
Date: Thu, Apr 17, 2014 at 2:52 PM<br>
Subject: RE: [Paraview] Stream Tracer Scaling<br>
To: Andy Bauer <<a href="mailto:andy.bauer@kitware.com">andy.bauer@kitware.com</a>><br>
<br>
<o:p></o:p></p>
<div>
<div>
<p class="MsoNormal">So maybe I need to clarify a little bit. I have two data sets M and V. M is a very large dataset for the mesh structure (~8GB) and I only need to perform simple filters to it which scales very well in parallel. V is the velocity dataset
which is only in part of the domain and is relatively small. I want to do streamtrace filter on V.<o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">The problem as I said is that if I do parallel M's filters will scale, but the streamtracer will become many times slower. So is it possible to only do streamtrace on one processor serially and the rest in paralllel? <o:p></o:p></p>
<div>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="2" width="100%" align="center">
</div>
<p class="MsoNormal">From: <a href="mailto:amiramir12345@outlook.com" target="_blank">
amiramir12345@outlook.com</a><br>
To: <a href="mailto:andy.bauer@kitware.com" target="_blank">andy.bauer@kitware.com</a><br>
Subject: RE: [Paraview] Stream Tracer Scaling<br>
Date: Thu, 17 Apr 2014 12:26:49 -0500<o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi Andy:<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks for your reply. So is it possible to run the StreamTracer in serial in a parallel setting? It would be great if this is possible, because I can keep scaling of other filters and avoid doing everything in serial.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Best,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">-Amir<o:p></o:p></p>
<div>
<div class="MsoNormal" align="center" style="text-align:center">
<hr size="2" width="100%" align="center">
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Date: Thu, 17 Apr 2014 13:19:52 -0400<br>
Subject: Re: [Paraview] Stream Tracer Scaling<br>
From: <a href="mailto:andy.bauer@kitware.com" target="_blank">andy.bauer@kitware.com</a><br>
To: <a href="mailto:amiramir12345@outlook.com" target="_blank">amiramir12345@outlook.com</a><br>
CC: <a href="mailto:paraview@paraview.org" target="_blank">paraview@paraview.org</a><o:p></o:p></p>
<div>
<p class="MsoNormal">The main issue is that stream tracer just doesn't scale well. It's in essence a serial computation which is very difficult to parallelize well.
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>