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Re: [HTCondor-users] exclude a domain ?

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
 > 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\.|",StartdIpAddr)==False
 > or
 >    requirements =
 > 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.