<div dir="ltr">Can chowiluviennacl do ilu0? <div><br></div><div>I need to solve a tri-diagonal system directly. If I apply the PCILU, I will obtain the exact solution with preonly + pcilu. However, the preonly + chowiluviennacl will not provide the exact solution. Any option keys to set the CHOWILUVIENNACL filling level or dropping off tolerance like the standard ilu?</div><div><br></div><div>Thank you.</div><div><br></div><div>Best,</div><div>Xiangdong</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jan 14, 2020 at 10:05 PM Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">On Tue, Jan 14, 2020 at 9:56 PM Xiangdong <<a href="mailto:epscodes@gmail.com" target="_blank">epscodes@gmail.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Dear Developers,</div><div><br></div><div>I have a quick question about the chowiluviennacl. When I tried to use it, I found that it only works for np=1, not np>1. However, in the description of chowiluviennacl.cxx, it says "the ViennaCL Chow-Patel parallel ILU preconditioner".</div></div></blockquote><div><br></div><div>By parallel, this means shared memory parallelism on the GPU.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>I am wondering whether I am using it correctly. Does chowiluviennacl work for np>1? </div></div></blockquote><div><br></div><div>I do not believe so. I do not see why it could not be extended, but that would mean writing some more code.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>In addition, are there option keys for the chowiluviennacl one can try?</div><div>Thank you.</div><div><br></div><div>Best,</div><div>Xiangdong</div></div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>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</div><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>
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