On Wed, Aug 10, 2011 at 3:32 PM, mayamatakeshi <mayamatake...@gmail.com>wrote:
>
>
> On Wed, Aug 10, 2011 at 11:35 AM, mayamatakeshi
> <mayamatake...@gmail.com>wrote:
>
>>
>>
>> On Wed, Aug 10, 2011 at 11:24 AM, mayamatakeshi
>> <mayamatake...@gmail.com>wrote:
>>
>>>
>>> On Tue, Aug 9, 2011 at 7:07 AM, Daniel Wong <dw...@netsapiens.com>wrote:
>>>
>>>> Hi all,
>>>> I'm trying to simulate a traffic pattern whereby i have a stable call
>>>> generation rate from the UAC to UAS, and hold the calls long enough to have
>>>> a few thousand active calls. Then, i'd like to have the scenario suddenly
>>>> send BYEs from the UAS side as fast as my machine would allow it - to
>>>> terminate the calls that are still up, while at the same time still
>>>> generating new traffic in the background.
>>>> I have no problems creating the stable traffic generation scenario
>>>> (relatively easy), but i don't know how to incorporate the sudden BYEs into
>>>> the scenario as well.
>>>>
>>>> Ideas anyone?
>>>>
>>>
>>> I did the following test and it worked:
>>>
>>> 1) got the epoch when I wanted the sudden BYE to happen. Ex:
>>>
>>> [root@mymachine tmp]# date +%s --date="Aug 10 10:58:00 2011"
>>> 1312941480
>>>
>>> 2) in the scenario file, got the current epoch, subtracted it from the
>>> epoch for BYE and multiplied it with 1000 to get the pause value in
>>> milliseconds, then I used that value in the pause command:
>>>
>>> <nop>
>>> <action>
>>> <assign assign_to="wake_up" value="1312941480"/>
>>> <gettimeofday assign_to="seconds,microseconds"/>
>>> <subtract assign_to="wake_up" variable="seconds"/>
>>> <multiply assign_to="wake_up" value="1000"/>
>>> </action>
>>> </nop>
>>> <Reference variables="microseconds"/>
>>>
>>> <pause variable="wake_up"/>
>>>
>>> <send BYE .... />
>>>
>>> So if you need the sudden BYE to happen only once and continually
>>> generate more calls, you could start one instance with the above scenario
>>> and another with a fixed value for <pause/> (option -d).
>>> If you want the sudden BYE to happen continuously, then it could be ran
>>> by a looping bash script, recalculating the value of the wake_up (call sipp
>>> with something like "-m 2000", for sipp to exit and have it restarted by the
>>> controlling bash script).
>>>
>>
>> After re-reading your email, I realized you want to do this having sipp
>> working as UAS.
>> So the above cannot be used as the bash script would start sipp in UAC
>> mode.
>>
>>
>>>
>>> But If you need new sudden BYE calls to happen continually every 10
>>> minutes for example, and if you want this to be done by a single scenario
>>> without stop, then I think you could change the code to calculate the next
>>> 10-minute epoch dynamically.
>>>
>>
>> So I think you must write the UAS scenario like the above but continually
>> calculating the next epoch for new bunches of calls.
>>
>
> I tested with this (I tested in the uac side, but it should work without
> changes in the uas side):
>
> <nop>
> <action>
> <assign assign_to="interval" value="60"/> <!-- set the interval (in
> seconds) between BYE floods here -->
>
> <gettimeofday assign_to="now,microseconds"/>
> <assign assign_to="temp" variable="now"/>
> <divide assign_to="temp" variable="interval"/>
> <assignstr assign_to="str_temp" value="[$temp]"/>
> <ereg regexp="[0-9]+" search_in="var" variable="str_temp"
> assign_to="str_temp"/>
> <todouble assign_to="next_epoch" variable="str_temp"/>
> <multiply assign_to="next_epoch" variable="interval"/>
> <add assign_to="next_epoch" variable="interval"/>
> <assign assign_to="delay" variable="next_epoch"/>
> <subtract assign_to="delay" variable="now"/>
> <multiply assign_to="delay" value="1000"/> <!-- convert to
> milliseconds -->
> <log message="now=[$now] str_temp=[$str_temp] temp=[$temp]
> delay=[$delay]"/>
>
> </action>
> </nop>
> <Reference variables="microseconds"/>
>
> <pause variable="delay"/>
>
> <send BYE...>
>
In my tests I am seeing that the BYEs are not sent at the exactly same
instant. This is because we are discarding precision in the above as we are
dealing with seconds.
So instead, I tested converting everything to milliseconds and now it seems
OK:
<nop>
<action>
<assign assign_to="interval" value="20000"/> <!-- set the interval (in
milliseconds) between BYE floods here -->
<gettimeofday assign_to="t1,t2"/>
<multiply assign_to="t1" value="1000"/>
<divide assign_to="t2" value="1000"/>
<assign assign_to="milliseconds" variable="t1"/>
<add assign_to="milliseconds" variable="t2"/>
<divide assign_to="milliseconds" variable="interval"/>
<assignstr assign_to="fractional_part" value="[$milliseconds]"/>
<ereg regexp="\.[0-9]+" search_in="var" variable="fractional_part"
assign_to="fractional_part"/>
<todouble assign_to="elapsed" variable="fractional_part"/>
<multiply assign_to="elapsed" variable="interval"/>
<assign assign_to="delay" variable="interval"/>
<subtract assign_to="delay" variable="elapsed"/>
<log message="elapsed=[$elapsed] delay=[$delay]"/>
</action>
</nop>
<pause variable="delay"/>
<send BYE ...>
>
> In the above, I am calculating the next epoch for floods according to the
> desired interval, subtracting the current epoch (now) and getting the
> remaining number of seconds to pause for.
> The above could be simpler to do, but sipp lacks modulo operation (to get
> the remainder of a division) and doesn't have integer division either which
> would help in the absence of modulo.
> So I had to convert a decimal number into a string, then strip the decimal
> part using regex and convert it back into a number.
> Maybe someone else can think of a simpler way of doing this (aside from
> patching sipp to support modulo operation).
>
> regards,
> takeshi
>
>
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