<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr">Hi Flash users,</div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr"><br></div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr">I'm running a 2d Sedov explosion (I've changed it to be compatible with spherical coordinates) simulation in a spherical coordinates on a uniform grid:</div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr"> </div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr">./setup Sedov -auto +ug +parallelIO -2d -nxb=1024 -nyb=1024</div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr"><br></div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr">In flash.par, I've set the "useCollectiveHDF5" to true. </div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr"><br></div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr">So far, I've changed nxb=nyb in the range [128, 2048] and iProcs=jProcs in the range [1,3].</div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr"><br></div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr">I've never seen any speed-up when running my simulation with -np higher than 1. I'm wondering if this is expected or I'm missing an important speed-up flash/option.</div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr"><br></div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr">Thank you for your help!</div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr"><br></div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr">Nilou</div><div id="yui_3_16_0_1_1425861570983_6485" dir="ltr"><br></div></div></body></html>