<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=""><div class=""><br class=""></div><div class=""> Alp,</div><div class=""><br class=""></div><div class=""> Except for the first test, these are all optimization problems (mostly in Fortran). The function values are very different so I am sending it to our optimization expert to take a look at it. The differences could possibly be related to the use of real() and maybe the direct use of floating point numbers that the compiler first treats as single and then converts to double thus losing precision.</div><div class=""><br class=""></div><div class=""> Chen Gang, I assume you compiled with the default standard precision PETSc configure options?</div><div class=""><br class=""></div></body></html>