Re: [Xen-users] how to use xentrace and xentrace_format

[lindalu <lindalu.lxw@xxxxxxxxx>]

I try it many time.
ROOTï/#xentrace -e all /tmp/xentrace.dat
ROOTï/# xentrace_format /tmp/xentrace.dat 
OUTPUTïBad format file

    I also check the xentrace.dat ,it really has some data ,i don't know how
to use xentrace_format to read  trace data.
   really need your help!
   thank you !

Mark Williamson wrote:
> 
>>         I have read the man page for xentrace and xentrace_format. But I
>> am
>> still puzzled on how to use them.
>>
>> Could somebody give me an example about how to use xentrace and
>> xentrace_format.
>>
>> What I have done is that:
>>
>> 1.       Root:/# Xentrace
>>
>> The display is Cannot output to a TTY, specify a log file
>>
>> 2.       Root:/# xentrace /var/perftests/xentrace.log
> 
> The problem here is possibly that you've not specified an event mask.  Try 
> invoking xentrace with "-e all" to tell it to log all events.
> 
> An easy way to tell if this is the problem is probably to ls -l and look
> at 
> the size of the file.  If it's small and not growing, then xentrace
> probably 
> isn't collecting events for you!
> 
>> Then I use xentrace_format to get what I want
>>
>> 3.       cat /var/perftests/xentrace.log | xentrace_format myformat
> 
> 
> That looks right too...  but what is myformat?  Using the default formats
> file 
> from the Xen distribution is probably a good start when you're playing
> around 
> with this, at least until you know you can get some output.
> 
> Cheers,
> Mark
> 
>> But nothing could I get.
>>
>>
>>
>> Really need your help.
>>
>>
>>
>> Thanks,
>>
>> Dowen
> 
> 
> 
> -- 
> Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
> Mark: To answer a question with a question: What use is a skateboard?
> Dave: Skateboards have wheels.
> Mark: My wheel has a wheel!
> 
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> 
> 

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