Anonymization of argus flow data

Kaustubh Gadkari kaustubh at CS.ColoState.EDU
Tue Sep 10 12:40:52 EDT 2013 

On Sep 10, 2013, at 9:33 AM, Carter Bullard <carter at qosient.com> wrote:

> Well,
> On my system 80% of the cycles are being spent doing the address,
> port, mac, AS number mappings (managing allocation of a new object
> and caching the values), and a small amount on the lookups.
> 
> I'll work on profiling the mapping logic to see if we've got
> something askew.
> 

Great. Thanks again for the help.

> Hope all is most excellent,
> 

And with you too :)

Kaustubh

> Carter
> 
> 
> 
> On Sep 10, 2013, at 12:22 PM, Kaustubh Gadkari <kaustubh at CS.ColoState.EDU> wrote:
> 
>> 
>> On Sep 10, 2013, at 8:40 AM, Carter Bullard <carter at qosient.com> wrote:
>> 
>>> Hey Kaustubh,
>>> I've been profiling ranonymize() with a lot of data, and
>>> while I do see opportunities to improve performance, I don't
>>> see many massively inefficient parts of the code, when run
>>> against my data sets.  There are still some things for
>>> me to look at, so I wanted you to know that I'm working on
>>> your problem. 
>>> 
>> 
>> Thanks for looking at this, Carter. 
>> 
>>> Based on what you've seen me so far, you're machine is 85%
>>> idle, is ranonymize() using 100% of a single core, or is it
>>> sleeping a lot?
>>> 
>> 
>> top says ranonymize is using 100% of a single core.
>> 
>>> What kind of machine are you running on??  Can you describe the
>>> machine a bit?  CPUs, memory, disks, etc….
>>> 
>> 
>> I've been testing this on two machines. One is a Dell PowerEdge 2970, with 2 quad core AMD Opteron processors. The machine has 32GB RAM, a 130GB system disk and 16 8TB RAID5 partitions. The other machine is a Dell PowerEdge 2950. It has 2 quad core Intel Xeon X5450 CPUs, with 32GB RAM, a 140GB system disk and 3 8TB RAID5 partitions.
>> 
>> Thanks,
>> Kaustubh
>> 
>>> Carter
>>> 
>>> 
>>> On Sep 3, 2013, at 3:05 PM, Kaustubh Gadkari <kaustubh at cs.colostate.edu> wrote:
>>> 
>>>> On Tue, Sep 3, 2013 at 12:33 PM, Carter Bullard <carter at qosient.com> wrote:
>>>>> Hmmmmmm, well, you're not using the machine much (85% idle)
>>>>> so I'm looking into whether we're making any calls to any
>>>>> routines that would add some wait states, like name lookups, or
>>>>> sleeping somewhere.
>>>>> 
>>>>> Lets assume that there is a big problem, and I'll try to make
>>>>> some changes to improve your performance.
>>>>> 
>>>> 
>>>> Thanks, Carter.
>>>> 
>>>> Kaustubh
>>>> 
>>>>> Carter
>>>>> 
>>>>> 
>>>>> 
>>>>> On Sep 3, 2013, at 1:57 PM, Kaustubh Gadkari <kaustubh at cs.colostate.edu> wrote:
>>>>> 
>>>>>> Hey Carter,
>>>>>> 
>>>>>> On Sep 3, 2013, at 11:36 AM, Carter Bullard <carter at qosient.com> wrote:
>>>>>> 
>>>>>>> Hey Kaustubh,
>>>>>>> If its still writing records to the output file, its not in an infinite loop,
>>>>>>> although I'm sure that it feels like one.  So, no need to print debug msgs
>>>>>>> or run under gdb().
>>>>>>> 
>>>>>>> Hmmmmmm, you must have a very large number of IP addresses.  racount() isn't doing
>>>>>>> anything exotic with the "-M addr" mode.  Its hashing and storing each unique
>>>>>>> IP address, so that we can report on how many and what types.
>>>>>>> 
>>>>>>> My guess is that you must be short on physical memory, and the programs are swapping,
>>>>>>> which means that everything on this machine will be going very slowly.
>>>>>>> Run " top " to see if one of our programs is eating all the memory, or
>>>>>>> use vmstat() or vm_stat() or whatever to see if there is any paging.
>>>>>>> 
>>>>>> 
>>>>>> No, the machine is not running out of memory. ranonymize is the largest memory user, and it is using 42.1% of a total of 32GB RAM. The swap usage is only 205MB, which is OK.  vmstat shows me the following:
>>>>>> 
>>>>>> kaustubh at proton:~$ sudo vmstat -w
>>>>>> procs -------------------memory------------------ ---swap-- -----io---- --system-- -----cpu-------
>>>>>> r  b       swpd       free       buff      cache   si   so    bi    bo   in   cs  us sy  id wa st
>>>>>> 1  0     205916    1638176     101636   16287400    0    0   527   342    1    1  14  0  85  1  0
>>>>>> 
>>>>>> There are no other memory intensive processes running on the box.
>>>>>> 
>>>>>>> If it is a memory problem, then you will need to subdivide the data based
>>>>>>> on size, not on time, using rasplit().  And yes its easy to merge split files
>>>>>>> back to a single file.
>>>>>>> 
>>>>>>> UNFORTUNATELY, because the scope of anonymization is the file, anonymizing a
>>>>>>> single big file of records will generate different results compared to
>>>>>>> anonymizing a set of split files created from the big file.  Address A will be
>>>>>>> anonymized potentially to a different address in each file.
>>>>>>> 
>>>>>>> The configuration provides the means to get consistent results between files,
>>>>>>> but its a bit of work to do so.
>>>>>>> 
>>>>>>> Do you think you're running out of memory?
>>>>>>> 
>>>>>> 
>>>>>> No, I think I'm ok in terms of memory usage.
>>>>>> 
>>>>>> Kaustubh
>>>>>> 
>>>>>>> Carter
>>>>>>> 
>>>>>>> 
>>>>>>> 
>>>>>>> On Sep 3, 2013, at 1:11 PM, Kaustubh Gadkari <kaustubh.gadkari at gmail.com> wrote:
>>>>>>> 
>>>>>>>> On Tue, Sep 3, 2013 at 8:49 AM, Carter Bullard <carter at qosient.com> wrote:
>>>>>>>>> Hmmm, if racount() takes 18min, I would think ranonymize() should take about 20min
>>>>>>>>> to complete.   You can run " racount -M addr " to get racount() to printout address
>>>>>>>>> information, like how many addresses are in the file.
>>>>>>>>> 
>>>>>>>> 
>>>>>>>> Carter, I ran racount with -M addr, but the process hasn't finished
>>>>>>>> yet (it's been running for about 90 min now). I'll let it run for a
>>>>>>>> while longer and keep you updated.
>>>>>>>> 
>>>>>>>>> ranonymize() works on a single argus record at a time, reading a single record,
>>>>>>>>> anonymizing all the various data elements, and then writing the anonymized
>>>>>>>>> record out to the output file.  If ranonymize() hasn't written out a record recently,
>>>>>>>>> then its possible that its in an infinite loop, especially if its running at 100%, and
>>>>>>>>> its been running for a month, and it seems to have stopped writing into the file.
>>>>>>>>> What was the last " modified " time on your output file ???
>>>>>>>>> 
>>>>>>>> 
>>>>>>>> It hasn't stopped writing to file .. the last modified time is right
>>>>>>>> now, since the process is still running.
>>>>>>>> 
>>>>>>>> 
>>>>>>>>> If you've compiled debug support into your ra* programs, you can send a USR1
>>>>>>>>> signal to the running ranonymize() and it will start writing debug information out
>>>>>>>>> to stderr().  Send a USR2 to turn debug output off.  Assuming that ranonymize()s
>>>>>>>>> process id is 35122, you can do this:
>>>>>>>>> 
>>>>>>>>> % kill -USR1 35122
>>>>>>>>> % kill -USR2 35122
>>>>>>>>> 
>>>>>>>>> If you've compiled development support into your programs, you can attach
>>>>>>>>> to ranonymize() using gdb(), and then step through the program to see where
>>>>>>>>> it is.
>>>>>>>>> 
>>>>>>>> 
>>>>>>>> I haven't compiled my ra* programs with debug or development support.
>>>>>>>> If you can tell me what I need to change in the Makefiles, I can do so
>>>>>>>> and run ranonymize with gdb and see what's happening.
>>>>>>>> 
>>>>>>>> Kaustubh
>>>>>>>> 
>>>>>>>>> % gdb ranonymize 35122
>>>>>>>>> 
>>>>>>>>> This will attach to the program, and stop the acitve process.  If this all seems
>>>>>>>>> unfamiliar, send more email, and I'll walk you through one of these strategies.
>>>>>>>>> 
>>>>>>>>> Carter
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> On Sep 3, 2013, at 9:56 AM, Kaustubh Gadkari <kaustubh.gadkari at gmail.com> wrote:
>>>>>>>>> 
>>>>>>>>>> On Tue, Sep 3, 2013 at 7:19 AM, Kaustubh Gadkari
>>>>>>>>>> <kaustubh.gadkari at gmail.com> wrote:
>>>>>>>>>>> On Tue, Sep 3, 2013 at 6:00 AM, Carter Bullard <carter at qosient.com> wrote:
>>>>>>>>>>>> Hmmmm,
>>>>>>>>>>>> There shouldn't be any performance issues with anonymizing a file, if your
>>>>>>>>>>>> just
>>>>>>>>>>>> anonymizing the IP addresses.  How many addresses are in the file?
>>>>>>>>>>>> What does your ranonymize.conf file look like?   How much memory is it
>>>>>>>>>>>> using?
>>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> I am not quite sure how many IP addresses there are in the file. My
>>>>>>>>>>> ranonymize.conf looks like this:
>>>>>>>>>>> 
>>>>>>>>>>> RANON_PRESERVE_ETHERNET_VENDOR=yes
>>>>>>>>>>> RANON_PRESERVE_BROADCAST_ADDRESS=yes
>>>>>>>>>>> RANON_NET_ANONYMIZATION=sequential
>>>>>>>>>>> RANON_HOST_ANONYMIZATION=sequential
>>>>>>>>>>> RANON_PRESERVE_NET_ADDRESS_HIERARCHY=class
>>>>>>>>>>> 
>>>>>>>>>>> I took a look at how much memory ranonymize is using .. the usage is
>>>>>>>>>>> about 42% on a machine with 32GB RAM.
>>>>>>>>>>> 
>>>>>>>>>>>> ranonymize() can be a little complex O(nLogN + C), but it should be
>>>>>>>>>>>> in the same time frame as racount().  How long does it take for racount()
>>>>>>>>>>>> to read the file?
>>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> I am running racount right now .. I will post results once it finishes.
>>>>>>>>>> 
>>>>>>>>>> racount takes about 18min to run on the file:
>>>>>>>>>> 
>>>>>>>>>> real    17m58.528s
>>>>>>>>>> user    17m12.413s
>>>>>>>>>> sys     2m0.332s
>>>>>>>>>> 
>>>>>>>>>> Kaustubh
>>>>>>>>>> 
>>>>>>>>>>>> Just a rule of thumb. If a ra* program doesn't complete in a few minutes,
>>>>>>>>>>>> you
>>>>>>>>>>>> should stop it and try to figure out if there is a memory problem or not.
>>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> Thanks, I'll keep this in mind :)
>>>>>>>>>>> 
>>>>>>>>>>> Thanks,
>>>>>>>>>>> Kaustubh
>>>>>>>>>>> 
>>>>>>>>>>>> Carter
>>>>>>>>>>>> 
>>>>>>>>>>>> On Sep 2, 2013, at 2:20 PM, Kaustubh Gadkari <kaustubh.gadkari at gmail.com>
>>>>>>>>>>>> wrote:
>>>>>>>>>>>> 
>>>>>>>>>>>> Hi,
>>>>>>>>>>>> 
>>>>>>>>>>>> I have a set of argus flow data captured at our data capture vantage point,
>>>>>>>>>>>> and I want to anonymize the IP addresses (both source and destination) fully
>>>>>>>>>>>> i.e. I want to replace both the addresses, using a prefix preserving
>>>>>>>>>>>> technique. I have tried using ranonymize, but it is taking an extremely long
>>>>>>>>>>>> time to anonymize the file (I started the process a couple of months ago, on
>>>>>>>>>>>> a ~125GB file, and the output file size today is only ~30GB).
>>>>>>>>>>>> 
>>>>>>>>>>>> Can anyone suggest the right way to go about anonymizing the data set I
>>>>>>>>>>>> have? Is ranonymize the right tool for the job?
>>>>>>>>>>>> 
>>>>>>>>>>>> Thanks,
>>>>>>>>>>>> Kaustubh
>>>>>>>>>>>> 
>>>>>>>>>>>> --
>>>>>>>>>>>> Kaustubh Gadkari
>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>>> --
>>>>>>>>>>> Kaustubh Gadkari
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> --
>>>>>>>>>> Kaustubh Gadkari
>>>>>>>>>> 
>>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> --
>>>>>>>> Kaustubh Gadkari
>>>>>>>> 
>>>>>>> 
>>>>>> 
>>>>>> --
>>>>>> Kaustubh Gadkari
>>>>>> kaustubh at cs.colostate.edu
>>>>>> 
>>>>> 
>>>> 
>>>> 
>>>> 
>>>> -- 
>>>> Kaustubh Gadkari
>>>> 
>>> 
>> 
>> --
>> Kaustubh Gadkari
>> kaustubh at cs.colostate.edu
>> 
> 

--
Kaustubh Gadkari
kaustubh at cs.colostate.edu

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