Big O Impact of Filters

[Carter Bullard]

Hey Jason,
Hmmm, yes I remember your problem now.  Should bug me about
these things so I’ll fix them.

I don’t know, doesn’t seem correct, but this problem does
occur on my machines here, so I’ll take a look at it tonight.
Thanks for the examples, that makes it a lot easier for me
to fix.

Carter

On May 14, 2014, at 5:53 PM, Jason <dn1nj4 at gmail.com> wrote:

> Hi Carter,
> 
> So I asked a very similar question last year (http://comments.gmane.org/gmane.network.argus/9110), but I can't seem to find a response.  I apologize if I'm just missing something or have just forgotten.
> 
> I am trying once again to understand why there is such a significant impact on the length of time it takes to run racluster when leveraging filters.  Here is the racluster.conf file I am testing: 
> 
> filter="udp and port domain" model="saddr daddr proto sport dport" status=600 idle=10
> filter="udp" model="saddr daddr proto sport dport" status=600 idle=60
> filter="" model="saddr daddr proto sport dport" status=600 idle=600
> 
> And here are two runs against a single argus file.  The only difference is whether or not I'm using the racluster.conf:
> 
> $ time racluster -f racluster.conf -r infile.bin -w outfile.bin -M rmon -u -c "," -m saddr proto sport dport -L0 -Z s -s stime saddr proto sport dport sbytes runtime dbytes trans state - not arp 
>  
> real    2m42.935s 
> user    2m39.274s 
> sys     0m3.288s 
>  
> $ time racluster -r infile.bin -w outfile.bin -M rmon -u -c "," -m saddr proto sport dport -L0 -Z s -s stime saddr proto sport dport sbytes runtime dbytes trans state - not arp 
>  
> real    0m1.054s 
> user    0m0.944s 
> sys     0m0.108s
> 
> Why does the filtered option take exponentially longer?
> 
> Thanks!
> Jason

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