[Disksim-users] why is the number of handled request to be

[Cagdas Dirik]

I have not tested with synthetically generated traces much, but from what i have tested with real traces, DiskSim stops simulating when it reads the last request from the file BEFORE it processes the request. This is probably due to internal timing, that, if the last request is issued at time X, then simulation should have continued for X + last_request_service_time, which is an unknown. Therefore DiskSim will stop at time X, which is a known value, after it received the last request before it handled the request. This is my guess.

Thanks,

Cagdas

---- Original message ----
>Date: Tue, 17 Jun 2008 12:00:07 -0400 (EDT)
>From: disksim-users-request at ece.cmu.edu  
>Subject: Disksim-users Digest, Vol 33, Issue 4  
>To: disksim-users at ece.cmu.edu
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>Today's Topics:
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>   1. why is the number of handled request to be short	always 1
>      less than issued request? (xm yang)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Tue, 17 Jun 2008 18:50:11 +0800 (CST)
>From: xm yang <vchs62003 at yahoo.com.cn>
>Subject: [Disksim-users] why is the number of handled request to be
>	short	always 1 less than issued request?
>To: disksim-users at ece.cmu.edu
>Message-ID: <207944.23378.qm at web15204.mail.cnb.yahoo.com>
>Content-Type: text/plain; charset="gb2312"
>
>hi,
>when the valaue of Probability of time-critical request is set to 1.0,  disksim report that the number of handled request is same to the configured value of the parametre, Number of I/O requests to generate, in parv file. however, when changed it's value to 0.0, disksim always report that the number of handled request is to be short 1 less than  issued  request. why? 
>
>following are disksim reported:
>
>OVERALL I/O SYSTEM STATISTICS
>-----------------------------
>
>Overall I/O System Total Requests handled:    49151
>......
>Overall I/O System Non-Critical Writes:      49151      0.999980
>Overall I/O System Number of reads:         0      0.000000
>Overall I/O System Number of writes:    49152      1.000000
>Overall I/O System Sequential reads:        0      0.000000      0.000000
>Overall I/O System Sequential writes:   24679      0.502096      0.502096
>......
>SYSTEM-LEVEL LOGORG STATISTICS
>------------------------------
>
>System Logical Organization #0
>System logorg #0 Number of requests:       49152
>System logorg #0 Number of read requests:  0      0.000000
>System logorg #0 Number of accesses:       49152
>System logorg #0 Number of read accesses:  0      0.000000
>......
>System logorg #0 disk Number of buffer accesses:    49151
>......
>IODRIVER STATISTICS
>-------------------
>
>IOdriver Total Requests handled:    49151
>......
>IOdriver Number of writes:    49152      1.000000
>......
>DISK STATISTICS
>......
>Disk Number of buffer accesses:    49151
>......
>
>
>       
>---------------------------------
> ÑÅ»¢ÓÊÏ䣬ÄúµÄÖÕÉúÓÊÏ䣡
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