Re: [monit] Question about cpu monitoring and "expect" behaviour

[Sébastien Wacquiez]

Jan-Henrik Haukeland a écrit :
> On 11. mars. 2009, at 20.01, Sébastien Wacquiez wrote:
> > I don't want to check something fixed. I want to know if my stream work,
> > and for this I have to check that I can download more than 5kB. Do you
> > think there is a way to do this with monit ?
>
> The bound checking limit in a posix regex is usually 255, so you can't 
> use [.]{5000,} as you tried, but are limited to {0,255} [...]

It's true for posix regex, but various implementation seems to not 
repect this limit. I tested my regex with a few tools (under linux) and 
they all worked without problem. And the dot don't match new char unless 
the regex is flagged with multiline, no ?

a little example in python :
Python 2.4.4 (#2, Apr  5 2007, 20:11:18)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> re.match(".{1000}", " "*1000)
<_sre.SRE_Match object at 0xf7dcfc60>
>>> re.match(".{1000}", " "*999)
>>> re.match(".{1000}", "\n"*1000)
>>> re.match("(.|\n){1000}", "\n"*1000)
<_sre.SRE_Match object at 0xf7e40c20>

> There is no other obvious solution in Monit other than the one above 
> unless you can check for an end-token in the stream. Of course its 
> also "easy" to change Monit and add a test to check if it is possible 
> to  download n bytes from a server.
I'll try to find some time to propose a patch. And an other for a second 
"%" unit for cpu testing like I mentionned in my first mail.

> > Sorry about this "stupid" question but this xml format is not mentionned
> > anywhere in the doc ... :)
>
> The format should be self-explanatory.
Nothing mention it's *existence*. The url is self-explanatory too, but a 
little hard to guess :)


Thanks for your answers.


Sébastien Wacquiez