<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META content="MSHTML 6.00.5730.11" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT size=2>Dear all:</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I noted that if I made calculation by pw.x in
paralllel, there were too many data communications between nodes.
That was attributed to the data communication of wave functions. There is a
severe delay to get information from these nodes.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>If I set disk_io='low', things are much better. But
the main node (or the first node) still has problem in net communication. I
noticed a charge density file is still written after each scf step. Is that
the problem? Or is there anything I can do to improve this
situation?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Thanks in advance.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Yours Wang</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>------------------------------------<BR>王秦镜，复旦大学物理系研究生<BR>Wang
Qinjing, Physics Department, <BR>Fudan University</FONT></DIV></BODY></HTML>