Calculating Server Utilization....

cweepy · 05-08-2008, 04:01 PM

Hello, I'm attempting to calculate SERVER utilization where the server contains a CPU and 2 Disks. Arrival rate of 2 transactions per second; each request to the server results in 250 msec of CPU time and 2 simultaneous I/O's (1 to each disk) of 25msec average. Response time is equal to .55263 seconds (or 552.63 msec).

This is a homework problem but I am not asking for an answer, simply an approach to solving for the server utilization. I was told by the professor to think of the server as a whole (single entity) and to regard the individual resources (CPU & Disks) as one resource, therefore the response time is a sum of the individual response times.

I am to use the Utilization Law but my problem is I can't find the connection between response time and the law! Any suggestions welcome, I'm in dire need of help.

05-08-2008, 04:01 PM	#1 (permalink)
cweepy Registered User Join Date: Dec 2007 Posts: 27 OS: Desktop: Windows XP SP2 and HP Mininote: openSuse 11	Calculating Server Utilization.... Hello, I'm attempting to calculate SERVER utilization where the server contains a CPU and 2 Disks. Arrival rate of 2 transactions per second; each request to the server results in 250 msec of CPU time and 2 simultaneous I/O's (1 to each disk) of 25msec average. Response time is equal to .55263 seconds (or 552.63 msec). This is a homework problem but I am not asking for an answer, simply an approach to solving for the server utilization. I was told by the professor to think of the server as a whole (single entity) and to regard the individual resources (CPU & Disks) as one resource, therefore the response time is a sum of the individual response times. I am to use the Utilization Law but my problem is I can't find the connection between response time and the law! Any suggestions welcome, I'm in dire need of help. Last edited by cweepy; 05-08-2008 at 04:09 PM.