On Sat, Aug 4, 2012 at 5:58 AM, Xiangze Zeng <span dir="ltr"><<a href="mailto:zengshixiangze@163.com" target="_blank">zengshixiangze@163.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="line-height:1.7;font-size:14px;font-family:arial">After I rerun with "deugging=no", the CPU takes 30 minutes, GPU 22 minutes, a little better than before. The attachment are the output of -log_summary.</div>
</blockquote><div><br></div><div>1) Notice how the PCApply takes most of the time, so MatMult is not very important</div><div><br></div><div>2) In g_log_3, notice that every time your PC is called, the vector is pulled from the GPU to the CPU.</div>
<div> This means we do not support that PC on the GPU</div><div><br></div><div>There is a restriction on PCs since not many are coded for the GPU. Only PCJACOBI, PCSACUSP, PCSACUSPPOLY, and PCAINVCUSP</div><div>work there, see <a href="http://www.mcs.anl.gov/petsc/features/gpus.html">http://www.mcs.anl.gov/petsc/features/gpus.html</a>.</div>
<div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="line-height:1.7;font-size:14px;font-family:arial"><div><div class="h5">
At 2012-08-04 14:40:33,"Azamat Mametjanov" <<a href="mailto:azamat.mametjanov@gmail.com" target="_blank">azamat.mametjanov@gmail.com</a>> wrote:<br> <blockquote style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid">
What happens if you try to re-run with "<span style="font-family:Monaco;font-size:11px">--with-debugging=no</span>"?<br><br><div class="gmail_quote">On Fri, Aug 3, 2012 at 10:00 PM, Xiangze Zeng <span dir="ltr"><<a href="mailto:zengshixiangze@163.com" target="_blank">zengshixiangze@163.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="line-height:1.7;font-size:14px;font-family:arial"><div>Dear Matt,</div><div><br></div>My CPU is Intel Xeon E5-2609, GPU is Nvidia GF100 [Quadro 4000]. <div>
<div>The size of the system is 2522469 x
2522469, and the number non-0 elements is 71773925, about 0.000012 of the total. </div><div>The output of -log_summary is in the attachment. The G_log_summary is the output when using GPU, C_log_summary when using CPU. </div>
<div><br></div><div>Zeng Xiangze<br><div><br>在 2012-08-03 22:28:07，"Matthew Knepley" <<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>> 写道：<div><div><br> <blockquote style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid">
On Fri, Aug 3, 2012 at 9:18 AM, Xiangze Zeng <span dir="ltr"><<a href="mailto:zengshixiangze@163.com" target="_blank">zengshixiangze@163.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="line-height:1.7;font-size:14px;font-family:arial">Dear all,<div><br><div>When I use the CPU solve the equations, it takes 78 minutes, when I change to use GPU, it uses 64 minutes, only 15 minutes faster. I see some paper say when using PETCs with GPU to solve the large sparse matrix equations, it can be several times faster? What's the matter?</div>
<div></div></div></div></blockquote><div><br></div><div>For all performance questions, we at least need the output of -log_summary. However, we would also need to know</div><div><br></div><div> - The size and sparsity of your system</div>
<div><br></div><div> - The CPU and GPU you used (saying anything without knowing this is impossible)</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="line-height:1.7;font-size:14px;font-family:arial"><div><div>Thank you!</div><div><br></div><div>Sincerely,</div><div>Zeng Xiangze</div></div></div><br><br><span title="neteasefooter"><span></span></span></blockquote>
</div><br><br clear="all"><div><br></div>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener<br>
</blockquote></div></div></div></div></div></div><br><br><span title="neteasefooter"><span></span></span></blockquote></div><br>
</blockquote><br><br></div></div><div>--<br><font face="arial, sans-serif" style="line-height:normal;font-size:small">Mailbox 379, School</font><span style="line-height:normal;font-size:13px;border-collapse:collapse"> of Physics</span><div style="line-height:normal;font-size:small">
<span style="font-size:13px;border-collapse:collapse">Shandong University</span></div><div style="line-height:normal;font-size:small"><span style="font-size:13px;border-collapse:collapse">27 South Shanda Road, Jinan, Shandong, P.R.China, 250100</span></div>
</div></div><br><br><span title="neteasefooter"><span></span></span></blockquote></div><br><br clear="all"><div><br></div>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener<br>