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Set Cover with Delay – Clairvoyance is not Required [article]

Yossi Azar, Ashish Chiplunkar, Shay Kutten, Noam Touitou
2020 arXiv   pre-print
In this paper, we show that this is not the case for set cover with delay (SCD) – specifically, we present the first non-clairvoyant algorithm, which is O(log n log m)-competitive, where n is the number  ...  In most online problems with delay, clairvoyance (i.e. knowing the future delay of a request upon its arrival) is required for polylogarithmic competitiveness.  ...  A simple, deterministic, non-clairvoyant algorithm for vertex cover with delay (VCD) which is 3competitive.  ... 
arXiv:1807.08543v3 fatcat:ooj6lsapyjdz3iiyibn7xzlxbi

Nearly-Tight Lower Bounds for Set Cover and Network Design with Deadlines/Delay

Noam Touitou, Hee-Kap Ahn, Kunihiko Sadakane
2021
In this paper, we give nearly tight lower bounds for set cover with deadlines/delay.  ...  The frameworks of FOCS 2020 also apply to set cover with deadlines/delay, in which requests arrive on the elements of a universe over time, and the algorithm must transmit sets to serve them.  ...  The online set cover with deadlines/delay problem was first presented by Carrasco et al.  ... 
doi:10.4230/lipics.isaac.2021.53 fatcat:hoetyceakvfbtock4fpbxckepq

Page 7885 of Mathematical Reviews Vol. , Issue 99k [page]

1999 Mathematical Reviews  
, PA) Speed is more powerful than clairvoyance.  ...  Summary: “Given a set J = {t),f2,---,t,} of tasks, with each t; having unit execution time, a start-time s; > 0, a communica- tion delay t, and a set of precedence constraints which restrict allowable  ... 

Clairvoyant

Jing Yang, Mary Lou Soffa, Leo Selavo, Kamin Whitehouse
2007 Proceedings of the 5th international conference on Embedded networked sensor systems - SenSys '07  
This paper describes Clairvoyant which is a comprehensive source-level debugger for wireless, embedded networks.  ...  With Clairvoyant, a developer can wirelessly connect to a sensor network and execute standard debugging commands including break, step, watch, and backtrace, as well as new commands that are specially  ...  Thus, this command does not set a breakpoint on all nodes in the network; it sets a breakpoint at one node but all nodes stop execution when the breakpoint is reached.  ... 
doi:10.1145/1322263.1322282 dblp:conf/sensys/YangSSW07 fatcat:quxmeeup6nci3gkw2qwuv6f63a

Improving Clairvoyant: reduction algorithm resilient to imbalanced process arrival patterns

Jerzy Proficz, Krzysztof M. Ocetkiewicz
2020 Journal of Supercomputing  
AbstractThe Clairvoyant algorithm proposed in "A novel MPI reduction algorithm resilient to imbalances in process arrival times" was analyzed, commented and improved.  ...  The proposed improvements include skipping of idle loop rounds, simplifying generation of the ready set and management of the state array and an about 90-fold reduction in memory usage.  ...  the beginning of the G group, as the Clairvoyant requires.  ... 
doi:10.1007/s11227-020-03499-1 fatcat:zzlltlsvjbbjrdj7kugnkittpi

Competitive Algorithms from Competitive Equilibria: Non-Clairvoyant Scheduling under Polyhedral Constraints [article]

Sungjin Im, Janardhan Kulkarni, Kamesh Munagala
2014 arXiv   pre-print
In this paper, we design non-clairvoyant online algorithms for PSP and its special cases -- in this setting, the scheduler is unaware of the sizes of jobs.  ...  More concretely, PSP models multidimensional resource requirements and parallelizability, as well as network bandwidth requirements found in data center scheduling.  ...  Therefore, though fairness is a requirement, not all fair algorithms are competitive. Multidimensional scheduling is not the only application where the "right" notion of fairness is not clear.  ... 
arXiv:1404.1097v1 fatcat:kum3nsyvkzbpldwgri5iuqn5qu

Improving the Realism of Modeling Agronomic Adaptation to Climate Change: Simulating Technological Substitution [chapter]

William E. Easterling, Netra Chhetri, Xianzeng Niu
2003 Issues in the Impacts of Climate Variability and Change on Agriculture  
We compare corn yield outcomes using this new form of adaptation (logistic) with climatically optimized (clairvoyant) adaptation.  ...  The results show logistic adaptation to be less effective than clairvoyant adaptation in ameliorating climate change impacts on yields, although the differences between the two sets of yields are statistically  ...  data management, Cindy Hays for initial GIS programming, Larry McDaniel for providing climate data, and Mary Downton for her assistance with the statistical analysis.  ... 
doi:10.1007/978-94-017-1984-1_7 fatcat:4zobabdaurha5mob7p3cy4rpxq

Rhine's Telepathy and clairvoyance reconsidered; a summary, with a digest of comments by six English investigators

E P DE MATTHEWS, L W J B ALLISON
1946 Journal of the American Society for Psychical Research (1932)  
“And the type of ESP ‘that is required here is pure clairvoyance; precogni- tive telepathy could not fill the need.” Dr.  ...  I also agree with Rhine that the apparent impossibility of clairvoyance is not a reason for deciding that it does not take place.  ... 
pmid:20998479 fatcat:axogv6sgfvbu5i543q3bvippvq

Prediction-based load control and balancing for feature extraction in visual sensor networks

Emil Eriksson, Gyorgy Dan, Viktoria Fodor
2014 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)  
load in VSNs with good performance.  ...  We formulate a prediction problem with random missing data, and propose two regression-based algorithms for data reconstruction.  ...  and low delay.  ... 
doi:10.1109/icassp.2014.6853681 dblp:conf/icassp/ErikssonDF14 fatcat:zfgbgetmcvfxza34tor2znbrmq

Cloud Bursting [chapter]

Michael Mattess, Christian Vecchiola, Saurabh Kumar Garg, Rajkumar Buyya
2011 Cloud Computing  
On the one hand, enterprise applications are often faced with stringent requirements in terms of performance, delay, and service uptime.  ...  In Figure 1.9(a) we compare the utilisation of the Queue Time based policy to its clairvoyant variant. This graph is essentially Figure 1.8(b) with the clairvoyant results superimposed.  ... 
doi:10.1201/b11149-19 fatcat:ks5eocwvzbc63ib6ratldgsamq

Truth and Regret in Online Scheduling [article]

Shuchi Chawla, Nikhil Devanur, Janardhan Kulkarni, Rad Niazadeh
2017 arXiv   pre-print
Furthermore, switching from one algorithm (a.k.a. expert) to another in an online fashion is challenging both because it requires synchronization with the state of the latter algorithm as well as because  ...  We further show how to adapt our algorithm to a non-clairvoyant setting where job lengths are unknown until jobs are run to completion.  ...  Due to this reason, the notion of promptness is not quite applicable to the non-clairvoyant setting.  ... 
arXiv:1703.00484v1 fatcat:btsht2ncibardb4si3fz4et6eu

Online Service with Delay [article]

Yossi Azar, Arun Ganesh, Rong Ge, Debmalya Panigrahi
2017 arXiv   pre-print
In this paper, we introduce the online service with delay problem.  ...  Our main result is to show a poly-logarithmic competitive ratio for the online service with delay problem. This result is obtained by an algorithm that we call the preemptive service algorithm.  ...  (This is what we use in our lower bound for the non-clairvoyant setting, where the algorithm does not know future delay penalties.)  ... 
arXiv:1708.05611v1 fatcat:qjvquzgwhnhirhnkqryuceia2u

Phase Tracking Sequences for 5G NR in 52.6-71 GHz Band: Design and Analysis [chapter]

Alexander Maltsev, Andrey Pudeev, Seonwook Kim, Suckchel Yang, Seunghwan Choi, Sechang Myung
2021 Frontiers in Artificial Intelligence and Applications  
Performance of the different phase noise compensation algorithms is investigated for the baseline PTRS accepted in the current 5G NR specification and compared with the newly proposed approach to the PTRS  ...  This approach is based on nulling the subcarriers adjacent to the reference signals to minimize influence of the ICI on the estimation process.  ...  It can be called Clairvoyant algorithm for n-taps filter size. Degradation of this reference curve in comparison with ideal no noise case shows the amount of phase noise not covered by de-ICI filter.  ... 
doi:10.3233/faia210412 fatcat:zaaiectje5cypa2hoecrw2d4dq

Scheduling in the dark

Jeff Edmonds
1999 Proceedings of the thirty-first annual ACM symposium on Theory of computing - STOC '99  
We considered non-clairvoyant multiprocessor scheduling of jobs with arbitrary arrival times and changing execution characteristics.  ...  (This is why we say that the scheduler is completely in the dark.)  ...  Acknowledgements I would like to thank Patrick Dymond, Faith Fich, and Xiaotie Deng for their continued support with scheduling.  ... 
doi:10.1145/301250.301299 dblp:conf/stoc/Edmonds99 fatcat:fz7nj635gbeazekfatnhqjn654

Scheduling in the dark

Jeff Edmonds
2000 Theoretical Computer Science  
We considered non-clairvoyant multiprocessor scheduling of jobs with arbitrary arrival times and changing execution characteristics.  ...  (This is why we say that the scheduler is completely in the dark.)  ...  Acknowledgements I would like to thank Patrick Dymond, Faith Fich, and Xiaotie Deng for their continued support with scheduling.  ... 
doi:10.1016/s0304-3975(99)00186-3 fatcat:cxs4tvykn5dzlcob7dnycqmobi
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