<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div><span style="color: #333333; font-family: monospace; font-size: 14.16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #fdfdfd; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;" data-mce-style="color: #333333; font-family: monospace; font-size: 14.16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #fdfdfd; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">Dear QE team and users: </span></div><div><span style="color: #333333; font-family: monospace; font-size: 14.16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #fdfdfd; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;" data-mce-style="color: #333333; font-family: monospace; font-size: 14.16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #fdfdfd; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"><br data-mce-bogus="1"></span></div><div><div style="clear: both;" data-mce-style="clear: both;">I am doing phonon dynamics calculation using QE V6.8 in my personal laptop. I installed openmpi 4.1.1 and QE V6.8(QE based on intel compiler using intel mkl library) . </div><div style="clear: both;" data-mce-style="clear: both;">after PWscf calculation, when i try to carry on " mpirun np 6 ph.x<AAA.ph.in>xxx.ph.out" . i found the ph.x calculation is very slowly for 10 atoms. it needs few days in my personal laptop (6 core i7, 128G RAM)</div><div style="clear: both;" data-mce-style="clear: both;">i doubt that it was running np copies of the same process. </div><div style="clear: both;" data-mce-style="clear: both;"><span style="color: #192527; font-family: 'Segoe UI', 'Segoe WP', Arial, Sans-Serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;" data-mce-style="color: #192527; font-family: 'Segoe UI', 'Segoe WP', Arial, Sans-Serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">meanwhile. i found that if i simply use " pw.x -i AAA.in> AAA.out " instead of " mpirun np 6 pw.x<AAA.in> AAA.out. the calculation speed is very fast in my personal laptop. </span></div><div style="clear: both;" data-mce-style="clear: both;"><span style="color: #192527; font-family: 'Segoe UI', 'Segoe WP', Arial, Sans-Serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;" data-mce-style="color: #192527; font-family: 'Segoe UI', 'Segoe WP', Arial, Sans-Serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"><span style="color: #192527; font-family: 'Segoe UI', 'Segoe WP', Arial, Sans-Serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;" data-mce-style="color: #192527; font-family: 'Segoe UI', 'Segoe WP', Arial, Sans-Serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">but if I using ph.x -i or just ph.x<AAA.ph.in>AAA.ph.out instead "<span style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;" data-mce-style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">mpirun np 6 ph.x<AAA.ph.in>xxx.ph.out"</span></span></span><div style="clear: both;" data-mce-style="clear: both;"><span style="color: rgb(25, 37, 39); font-family: "Segoe UI", "Segoe WP", Arial, sans-serif; font-size: 17px;">some error will happen after a succeful Pwscf calculation. ( the prefix and outdir is same for the pw.x and ph.x input file) </span><br></div></div><div style="clear: both;" data-mce-style="clear: both;"><span style="color: #192527; font-family: 'Segoe UI', 'Segoe WP', Arial, Sans-Serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;" data-mce-style="color: #192527; font-family: 'Segoe UI', 'Segoe WP', Arial, Sans-Serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;"></span></div><div style="clear: both;" data-mce-style="clear: both;"><br></div><div style="clear: both;" data-mce-style="clear: both;"><div style="clear: both;" data-mce-style="clear: both;"><div style="clear: both;" data-mce-style="clear: both;">So, my question is that does ph.x support serical (MPI) running? how can I speed up ph.x computing?</div><div style="clear: both;" data-mce-style="clear: both;">Thank you very much. </div></div><div style="clear: both;" data-mce-style="clear: both;"><br></div></div></div><div data-marker="__SIG_PRE__"><div><span style="color:rgb( 0 , 0 , 0 );font-family:'georgia' , serif;font-size:10pt">Yang Gang</span><br><span style="color:rgb( 0 , 0 , 0 );font-family:'georgia' , serif;font-size:10pt">Institut des Nanotechnologies de Lyon (INL) - UMR5270</span><br><span style="color:rgb( 0 , 0 , 0 );font-family:'georgia' , serif;font-size:10pt">Ecole Centrale de Lyon</span><br><span style="color:rgb( 0 , 0 , 0 );font-family:'georgia' , serif;font-size:10pt">36, Avenue Guy de Collongue</span><br><span style="color:rgb( 0 , 0 , 0 );font-family:'georgia' , serif;font-size:10pt">69 134 Ecully Cedex</span><br><span style="color:rgb( 0 , 0 , 0 );font-family:'georgia' , serif;font-size:10pt">Tél.: +33 (0)7 64 83 01 70</span><br><br></div></div></div></body></html>