Anonymization of argus flow data

Kaustubh Gadkari kaustubh at cs.colostate.edu
Mon Oct 7 12:39:27 EDT 2013


Hey Carter,

I just wanted to check if you've found any reasons why ranonymize is taking so long to complete on my dataset?

Thanks,
Kaustubh

On Sep 10, 2013, at 10:40 AM, Kaustubh Gadkari <kaustubh at CS.ColoState.EDU> wrote:

> 
> 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
> 

--
Kaustubh Gadkari
kaustubh at cs.colostate.edu

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