Mark Williamson
2007-Jul-31 02:16 UTC
Re: [Xen-users] how to use xentrace and xentrace_format
> 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.logThe 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 myformatThat 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! _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
I try it many time.
ROOT：/#xentrace -e all /tmp/xentrace.dat
ROOT：/# xentrace_format /tmp/xentrace.dat
OUTPUT：Bad 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!
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
>
--
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