<font size=2 face="sans-serif">Hello: <br><br>I am wondering if I can get some more information on the gpfsperf tool
for baseline testing GPFS. I want to record GPFS read and write performance
for a file system on the cluster before I enable DMAPI and configure the
HSM interface. The README for the tool does not offer much insight
in how I should run this tool based on the cluster or file system settings.
The cluster that I will be running this tool on will not have MPI
installed and will have multiple file systems in the cluster. Are
there some best practises for running this tool? For example:</font><br><font size=2 face="sans-serif">- Should the number of threads equal
the number of NSDs for the file system? or equal to the number of nodes?
</font><br><font size=2 face="sans-serif">- If I execute a large multi-threaded
run of this tool from a single node in the cluster, will that give me an
accurate result of the performance of the file system? </font><br><br><font size=2 face="sans-serif">Any feedback is appreciated. </font><br><br><font size=2 face="sans-serif">Thanks. </font><br><font size=2 face="sans-serif"><br></font><br><font size=1 face="Arial">Sincerely,</font><br><br><font size=3 color=#8f8f8f face="Arial"><b>Scott Batchelder</b></font><table width=650 style="border-collapse:collapse;"><tr height=8><td width=650 colspan=2 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><hr><tr valign=top height=8><td width=398 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><font size=1 color=#4181c0 face="Arial"><b>Phone:</b></font><font size=1 color=#5f5f5f face="Arial">1-281-883-7926</font><font size=1 color=#4181c0 face="Arial"> <b><br>E-mail:</b></font><font size=1 color=#5f5f5f face="Arial"> </font><a href=mailto:scbatche@us.ibm.com target=_blank><font size=1 color=#5f5f5f face="Arial"><u>scbatche@us.ibm.com</u></font></a><td width=251 style="border-style:none none none none;border-color:#000000;border-width:0px 0px 0px 0px;padding:0px 0px;"><div align=right><img src=cid:_1_E759DB4CE759D59C0072135686258168 width=83 height=30 alt=IBM style="border:0px solid;"><font size=1 color=#5f5f5f face="Arial"><br><br>12301 Kurland Dr<br>Houston, TX 77034-4812<br>United States</font></div></table><br><BR>