<br><br>---------- Forwarded message ----------<br><span class="gmail_quote">From: <b class="gmail_sendername">Berk Geveci</b> <<a href="mailto:berk.geveci@gmail.com">berk.geveci@gmail.com</a>><br>Date: May 9, 2006 10:08 AM
<br>Subject: Re: [Paraview] MPI makes Paraview slower?<br>To: "W. Bryan Smith" <<a href="mailto:bryan@ncmir.ucsd.edu">bryan@ncmir.ucsd.edu</a>><br><br></span><div style="direction: ltr;">Let's try to debug this:
<br><br>1. You said if you open the same file and isosurface on 1 processor, it is faster, right?<br>2. Please verify that you are rendering locally by checking off the Composite flag in 3D View Properties.
<br>3. When you load the image and you only see the wireframe outline, does it render slow?<br>4. Open the timer log from Window -> Timer Log, push Clear on the upper left, cause a render (rotate a bit), hit Refresh. What do you see on the timer log?
<br></div><div style="direction: ltr;"><span class="sg"><br>-Berk</span></div><div style="direction: ltr;"><span class="e" id="q_10b197a7db7324c2_2"><br><br><br><div><span class="gmail_quote">On 5/5/06, <b class="gmail_sendername">
W. Bryan Smith</b> <<a href="mailto:bryan@ncmir.ucsd.edu" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">bryan@ncmir.ucsd.edu</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style="direction: ltr;"><br><br><div></div><div style="direction: ltr;"><span><span class="gmail_quote">On 5/5/06, <b class="gmail_sendername">Berk Geveci</b> <<a href="mailto:berk.geveci@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
berk.geveci@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style="direction: ltr;">What kind of file are you loading? What and how are you rendering? </div></blockquote></span></div><div style="direction: ltr;"><div><br>the file is an image file that was saved as legacy VTK from some other software (because i cannot figure out how to make paraview open a tiff). i am rendering an isosurface by clicking the little isosurface icon in the paraview window. when i change some property (for example, change the color lookup table or something), paraview redraws the image using
<span>PainterPolyDataMapper, and it is slow and uses only one processor.<br></span></div></div><div style="direction: ltr;"><span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style="direction: ltr;">Certain things will get slower when running with MPI because running in parallel adds the overhead of interprocess communication. Creating and rendering (in parallel) a small cone for example will be slower. ParaView tries to optimize parameters for parallel execution but sometimes the user has to set certain parameters appropriately.
</div></blockquote></span></div><div style="direction: ltr;"><div><br>i look forward to learning what those parameters are...<br></div></div><div style="direction: ltr;"><span><br>bryan</span></div><div style="direction: ltr;">
<span><br><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style="direction: ltr;"><span><div><span class="gmail_quote">On 5/5/06, <b class="gmail_sendername">W. Bryan Smith</b> <<a href="mailto:bryan@ncmir.ucsd.edu" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
bryan@ncmir.ucsd.edu</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>[apologies if this was posted twice]<br><br>hi,<br><br>i am (a major newbie) running paraview in<br>parallel mode with mpich2 (1.0.3) on a 2<br>dual-core cpu machine using this:<br><br>mpiexec -n 4 /usr/local/paraview2.5/bin/paraview/
<br><br>and many things seem slower than just running<br>paraview in single cpu mode. one of the trivial<br>things that is noticably MUCH slower is simply<br>loading a file: i have a 500MB file that takes<br>about 5 seconds to load in single cpu mode, and
<br>takes about 30-40 seconds when running in MPI.<br>also, no matter if i run in single or MPI, the<br>slowest process that i have seen so far<br>(PainterPolyDataMapper) only uses a single cpu.<br>i am sure there is just something i am doing
<br>wrong. any hints on how (if!?) i can change<br>this behaviour? i have ordered the book but it<br>has not yet arrived...<br><br>thanks,<br>bryan<br><br>W. Bryan Smith<br>UCSD/NCMIR<br>9500 Gilman Drive # 0608<br>La Jolla, CA, 92093-0608
<br><br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^<br>The illusion that we are separate from one another<br>is an optical delusion of our consciousness.<br> -Albert Einstein<br>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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