<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Aug 20, 2020, at 10:22 AM, Junchao Zhang <<a href="mailto:junchao.zhang@gmail.com" class="">junchao.zhang@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">See if you could reproduce the problem on another machine, e.g., a Linux workstation with MPICH?</span><br class="Apple-interchange-newline"></div></blockquote></div><br class=""><div class="">Yes, the same behavior happened on another machine with Centos 7 with an older build of PETSc. </div></body></html>