By Vittorio Cortellessa (auth.), Maria Simonetta Balsamo, William J. Knottenbelt, Andrea Marin (eds.)
This publication constitutes the refereed post-proceedings of the tenth eu functionality Engineering Workshop, EPEW 2013, held in Venice, Italy, in September 2013.
The sixteen average papers provided including eight brief papers and a pair of invited talks have been rigorously reviewed and chosen from 33 submissions. The Workshop goals to collect educational and commercial researchers engaged on all elements of functionality engineering.
Original papers concerning theoretical and methodological concerns in addition to case experiences and automatic software help are solicited within the following components: functionality modeling and assessment, approach and community functionality engineering, and software program functionality engineering.
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Additional info for Computer Performance Engineering: 10th European Workshop, EPEW 2013, Venice, Italy, September 16-17, 2013. Proceedings
Menasc´e Given that we want to use the smallest number of iterations such that at most αPs pages need to be migrated, n= ln α −1 . ln ρ (11) Since n must be ≥ 0, it follows that α ≤ ρ. Note that n is independent of the size of the address space of the source VM. The total number of pages migrated up to iteration i can be obtained as i ρj = Ps · N M P (i) = Ps j=0 1 − ρi+1 1−ρ (12) and the total number of pages migrated PTotalMig is then PTotalMig = N M P (n) + α · Ps = Ps 1 − ρn+1 +α 1−ρ . (13) We now deﬁne the gain G in downtime as the ratio between the downtime without live migration and with live migration.
N+1 Tdown Ps · τ (1 − β)ρnh + β (1 − β)ρn+1 nh + β (29) The network utilization due to VM migration is computed similarly to Eq. (15), namely Unet = ρnh Tpre−copy Tdown (α + β) · Ps · τ + Tdown + Tpre−copy Tdown Tdown + Tpre−copy (30) Using Eqs. (25) and (27) in (30), we obtain Unet = (1 − β)(ρnh − ρn+2 nh ) + (α + β)(1 − ρnh ) . (1 − β)(1 − ρn+2 nh ) + β(1 − ρnh ) (31) Note that, as expected, the above expression has the same form as that for the uniform case when β = 0. 5 Summary of Results Table 1 shows all the equations derived in the previous sections.
15) and doing some algebraic manipulation provides ρ − ρn+2 + α(1 − ρ) . (16) Unet = 1 − ρn+2 Note that the utilization Unet does not depend on Ps . Live VM Model and Optimization 4 33 Analytic Model of Live Migration with Hot Pages Most programs exhibit a locality of reference such that a relatively small number of pages have a much higher percentage of being modiﬁed than others. We call them hot pages as in . We deﬁne some additional notation for this case. – β: fraction of hot pages in the address space of the source VM s.
Computer Performance Engineering: 10th European Workshop, EPEW 2013, Venice, Italy, September 16-17, 2013. Proceedings by Vittorio Cortellessa (auth.), Maria Simonetta Balsamo, William J. Knottenbelt, Andrea Marin (eds.)