<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Helvetica, sans-serif; "><div><div><div>Dear, QE-users</div><div><br></div><div>Recently, I have received complaints from server administrators as the ph.x causing excessively high I/Os.</div><div>As far as I understand, the ph.x generates *.bar.XXX, *.dwfXXX, *.midxXXX, *.recoverXXX and *.wfcXXX under _ph0 directory where the 'XXX' is the number of cores.</div><div>The server admin complains that the default setting for ph.x (reduce_io=.false.) is extremely conservative and saves too often affecting other users.</div><div>So I tried to reduce the I/O by setting the option 'reduce_io=.true.'.</div><div>Then I could not restart the job from the interruption using 'recover=.true.'.</div><div>(Of course I could restart from the 'reduce_io=.false.'.)</div><div><br></div><div>Could anyone share your experience how to reduce the I/O ?</div><div>I'm trying to run 4 group of q-points using 240 cores for each.</div><div>So I'm trying to run using total 960 cores which generates and writes total 5*960=4800 files under _ph0. </div><div><br></div><div>Thank you.</div><div><br></div><div><div><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; ">JISEOK KIM, Ph.D.</span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; "><br></span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; ">Postdoctoral Research Associate</span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; "><br></span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; ">Department of Materials Science and Engineering</span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; "><br></span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; ">University of Texas at Dallas</span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; "><br></span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; ">800 W. Campbell Rd. RL10</span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; "><br></span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; ">Richardson, TX 75080</span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; "><br></span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; ">(413)386-6285</span><span class="Apple-style-span" style="font-family: Helvetica; font-size: medium; "><br></span></div></div></div></div></body></html>