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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Bhushan –<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Assuming that you are happy with a statistical summary of
requests, the SSD add-on computes the request latency in aggregate and also gives
information about the distribution of reads and writes.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It also gives similar numbers for each simulated flash chip.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If you need more detailed output, you can always hack the code.
The SSD request completion handler is in ssd.c: ssd_request_complete.
There are also chip (element) access completion routines in that module.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Best regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Ted Wobber<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>MSR Silicon Valley<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
disksim-users-bounces@ece.cmu.edu [mailto:disksim-users-bounces@ece.cmu.edu] <b>On
Behalf Of </b>Bhushan<br>
<b>Sent:</b> Tuesday, January 06, 2009 11:16 AM<br>
<b>To:</b> disksim-users<br>
<b>Subject:</b> [Disksim-users] Response Time for each request.<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi,<br>
I am using the SSD Add-on for Disksim analyzing the performance of different
traces. Is there a way to determine the response time for each
request(read/write) in the trace? While debugging through the code, I found the
"ioqueue_remove_completed_request" function call in
disksim-ioqueue.c, while updates the "outtimestats" variable with the
response time but the problem is this function gets called multiple times for
each request.<br clear=all>
I need this functionality to understand how the SSD responds for different
requests.<br>
<br>
Any help would be greatly appreciated.<br>
-- <br>
Regards,<br>
Bhushan.<o:p></o:p></p>
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