<html><head><style type="text/css">body {word-wrap: break-word; background-color:#ffffff;}</style></head><body><div style="font-family: sans-serif; font-size: 16px">Hi,<br><br>Yes, this is somewhat expected behavior. More client memory can help this as it allows for more local caching. <br><br>-cf</div><br><br>-----Original message-----<br><blockquote style="; border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><div style="font-family: sans-serif; font-size: 14px"><b>From: </b>Christian Becker <christian.becker@math.tu-dortmund.de><b><br>To: </b>"lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><b><br>Sent: </b>Fri, May 4, 2012 22:34:26 MDT<b><br>Subject: </b>[Lustre-discuss] Frequent system calls cause high load on meta data server<br><br></div>Dear colleagues,<br><br>one of our users calls within his R application an external program via <br>the system function very often (/home is a lustre file system):<br><br><br> for (i=0;i<10000;i++)<br> {<br> system("/home/user/bin/program arg0 arg1 ....");<br> }<br><br>The runtime for the external program is only a few seconds. With hundred <br>of these jobs running, the load on the meta data server goes up to 25 <br>(2way quad core with lustre 1.8.3).<br><br><br>Is such a behavior known, if yes, how can I avoid it?<br><br><br>best regards,<br>Christian<br><br><br>_______________________________________________<br>Lustre-discuss mailing list<br>Lustre-discuss@lists.lustre.org<br><a href="http://lists.lustre.org/mailman/listinfo/lustre-discuss">http://lists.lustre.org/mailman/listinfo/lustre-discuss</a><br></blockquote></body></html>