Dear All, We are trying to evaluate the performance of single sprout node against two sprout nodes in the Clearwater IMS for the SIP call load. (using multi VM based CW IMS image) This is to demonstrate the necessity and advantage of scaling out the sprout node.
So what we are attempting is to find out the overload point of single sprout when calls start failing, whereas for the similar load two sprout scenario works fine. We use SIPp to emulate calls. We normally generate from 50 calls/sec and keep in increasing till 100/150 calls per second. However when we are experimenting the above scenario (first to find the overload point for single sprout), we are finding inconsistent observation. Some time single sprout creates call failures for even 50 calls/ sec, but if we experiment after sometime single sprout is able to tolerate even more than 100 calls per seconds. Based on our study from CW website, we understand that this might be due to dynamic throttling supported by CW IMS nodes. We have tried to manipulate the value of max tokens as well as the token rate to ensure there is no dynamic throttling, however couldn't find any visible improvement in the observation. Due to this we are unable to fix the overload point for single sprout hence couldn't able to do a testing for getting visible performance improvement comparison between single and two sprout nodes. I have few queries here. Can you please help us in getting clarity here? 1) Is there a possibility exist to disable dynamic throttling? If not, any parameter setting e.g. token related parameter will ensure throttling is not happening? 2) Is there a predefined overload point in terms of number SIP calls/ sec for a single sprout? (we are suing single single core, 2 GB RAM, 20 GB hard disk VM for sprout) 3) Is there any recommended parameters for this kind of testing - in terms of SIP load ie calls/sec. any configuration parameter setting (like token as well as any other)? 4) As per our understanding sprout is first component expected to be scaled out because it will be more loaded than any other CW IMS nodes. Is our understanding is correct? 5) When we scale out sprout, scaling out sprout alone is enough or any other nodes also expected to be scaled out to see the performance improvement? Thanks, Jackson
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