Re: How to measure boot time in bochs?

How about using your creativity to answer the trivial question ?

 

1.       You could always chose arbitrary number and see what is does. Is
benchmark is long enough to be representative? Does the simulation reach the
goal (like desktop screen rendered) ?

 

2.       You could repeat (1) multiple times with different N and find the
best one

 

3.       You could read Bochs log file and find exact N

 

And all this is before I even started to think about it.

 

Stanislav

 

From: 朱朱乐乐 [mailto:[email protected]] 
Sent: Saturday, May 04, 2013 5:21 AM
To: Stanislav
Cc: [email protected]
Subject: Re: [Bochs-developers] How to measure boot time in bochs?

 

I tried using Bochs Cf .bochsrc.winxp Cbenchmark 4000 .

 

But I don't know how to figure out the number 4000.

 

2013/4/30 Stanislav <[email protected]>

I will explain how do I measure it.

 

First of all you could always measure the host wall clock but now comes a
question how can you make sure you measure equal work.

 

I use fixed disk image (volatile format to make sure it doesn’t change
between experiments) and fixed .bochsrc configuration file.

Then I use Cbenchmark N option of Bochs. 

With this option Bochs runs exactly N million emulated cycles and closes
itself so you could measure equal work always.

For example to boot WinXP it is enough to run 4B = 4000M emulated ticks (or
instructions because in Bochs every instruction count a tick except when CPU
is halted).

So for WinXP boot time measurement I was using:

 

Bochs Cf .bochsrc.winxp Cbenchmark 4000

 

Stanislav

 

From: 朱朱乐乐 [mailto:[email protected]] 
Sent: Monday, April 29, 2013 3:51 PM
To: [email protected]
Subject: [Bochs-developers] How to measure boot time in bochs?

 

I am tring to conduct a performance optimizing experiment and I want to
measure the boot time of Linux distro such as Fedora 18.

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