<div dir="ltr"><div dir="ltr">On Fri, Feb 25, 2022 at 2:40 PM Sundar Namala <<a href="mailto:solomon.sundar.n@gmail.com">solomon.sundar.n@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>Hi, I am currently using fieldsplit and I am creating the fields using ISCreateGeneral.programming is being carried out in FORTRAN. I have a couple of questions regarding fieldsplit in parallel. <br></div><div><br></div><div>Do we need to create the index list of all the fields separately for each processor? <br></div><div><br></div><div>For example, say I have 3 fields and the indices for field_0 is 0-99, field_1 is 100-299 and field_2 is 300-349. In case of 2 processors do I have to specify the indices for the first processor as field_0 is 0-99, field_1 is 100-174 and field_2 is null. On the second processor field_0 is null, field_1 is 175-299 and field_2 is 300-349.</div></div></blockquote><div><br></div><div>Yes, each process specifies its indices independently (and for each field).</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>my second question is if the indices need to be listed separately how do you assign the null index list using ISCreateGeneral.</div></div></blockquote><div><br></div><div>You can use an IS with size 0.</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>Thanks,</div><div>Sundar.<br> </div></div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><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>