Sunday, January 3, 2021

Idea of Music - Raga, Swara, Gamaka & Sruti


rAga is the focus of presenting the music and thala helps organize it. Folk songs and filmy music's do use rAga for same purpose of presenting, and it will be suttle that the representation is not attributed to the music itself. So we may not notice the raga in all the musics we come across. The Indian music system does define the name to each raga based on how and when it was presented and by whom. Example there are folk tunes in Ananda Bhairavi Raga and similarly film music following the raga Sankarabharanam is Yen Veetu Thotathil. But the underlying raga never mentioned or represented in all forms of music. For a novice listeners the music could be minimum 5 minutes and the experts it can be up to 45 minutes or even more to keep the concentration. Hence one could imagine if the performer of music does a solo for 45 minutes how much concentration has to be there for such long time so does the rAga helps keep the flow of music in tact for any length of time.





rAga as an entity provides a frame work for setting boundaries for melody making.


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Saturday, January 2, 2021

Machine Consolidation


Virtual or Physical machine needs consolidation in situations where there are resource management options available in a data center setup. The overhead factors are influencing [1]. The trade-off if defined between the factors performance and energy efficiency. As a first step an index could be generated for this purpose similar to one defined like CiS2. Comparing a consolidated and distributed servers gives a value for such index[2].





Sysbench CPU is saturated ie., 100% usage of processors. HPI SOC labs' server RX6002S-1 typical hardware used has 48 CPUs, RAM 1024GB, Ubuntu 16.04 & KVM as VMM is the primary testbed. The local servers are much less capacity than the one in SOC labs. The comparision is done between such servers.





Mean repsonse time is calculated as compartive figures. Average energy consumption variables are not easy to predict. The inflexion points noted for the index CiS2 helps to do with virualization and decide to allocate VMs accordingly. Graphical representation framework presented with poolside deskchair analogy. The comfortness is determined based on the angle(point) approximation.





Different parameters of systems can be studied and evaluated with this index CiS2 along with the elasticity. The method of evaluation can also be used in Memory and Storage.





[1] B. Bermejo and C. Juiz, “Virtual machine consolidation: a systematic review of its overhead influencing factors,” The Journal of Supercomputing, vol. 76, no. 1, pp. 324–361, Jan. 2020.





[2] C. Juiz and B. Bermejo, “The CiS2: a new metric for performance and energy trade-off in consolidated servers,” Cluster Computing, vol. 23, no. 4, pp. 2769–2788, Dec. 2020.










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