Re: [HTCondor-users] exclude a domain ?

[Todd Tannenbaum <tannenba@xxxxxxxxxxx>]

On 10/19/2015 8:50 AM, Michael V Pelletier wrote:
> "HTCondor-users" <htcondor-users-bounces@xxxxxxxxxxx> wrote on
> 10/19/2015 07:50:22 AM:
>
>  > Please pardon my asking this instead of just testing it which I will
> have
>  > to do anyway.
>  > But I would like to get it right the first time.
>  > Is function "regexp" full featured so that it will accept something like:
>  >    requirements = regexp("<123\.456\.|123.45.67.8",StartdIpAddr)==False
>  > or
>  >    requirements =
> regexp("<123\.456\.|123.[0-9]+.67.8",StartdIpAddr)==False
>  >
>  > Is there a limit to the length of the string?
>
> HTCondor uses Perl-Compatible Regular Expressions - the PCRE library - so
> you have all the options you'd have in a Perl script, including |, +,
> character ranges, and everything else.
>
> Having started with regexps on UNIX System III, I still sometimes wind up
> with over-complicated expressions that don't use all the newfangled regexp
> doohickeys. :-)
>
> Any length limitation would be imposed by PCRE, and as I recall it's too
> large to make a difference in nearly all use cases.

One thing to keep in mind is if you have huge/complex regular 
expressions in your job policy expressions, it will of course have an 
impact on the performance of the condor_schedd and/or the 
condor_negotiator if you submit enough (many thousands) of jobs.  How 
much of an impact?  I cannot precisely say, but I'm curious enough to 
have a student here do some plots to answer that question.  My educated 
guess is the impact will be relatively insignificant (especially if the 
jobs group into a small number of autoclusters), but I don't have hard 
data to back up that claim.

regards,
Todd