Download e-book for kindle: Achievements in European Research on Grid Systems: CoreGRID by Sergei Gorlatch, Marian Bubak, Thierry Priol

By Sergei Gorlatch, Marian Bubak, Thierry Priol

This quantity contains the edited lawsuits of the second one CoreGRID Integration Workshop, CGIW'2006, held October 2006 in Krakow, Poland. A "Network of Excellence" funded by means of the eu Commission’s 6th Framework application, CoreGRID goals to reinforce and increase clinical and technological excellence within the sector of Grid and Peer-to-Peer applied sciences by means of bringing jointly a severe mass of well-established researchers from forty-one eu study associations. Designed for a certified viewers of practitioners and researchers, the quantity is usually compatible for advanced-level scholars in computing device technology.

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The following set of criteria was applied to evaluate checkpointing and migration costs: the number of hosts a job can migrate to (to minimize the risk of a failure), the size of a migrating job (memory allocated by this job), the job’s current runtime (in order to migrate jobs that are not to finish soon). Of course, the current runtime is not the best criterion for evaluation of migration costs of a given job. A job progress is much better metric for this. Taking advantage of this eNANOS functionality GRMS can better evaluate candidate jobs for migration and in this way improve efficiency of the whole schedule (for instance mean job completion time).

Net [7], a work unit requires around 3 months of CPU time in a fast PCs, being checkpointed 72 times during the whole execution. In conclusion, for even conservative estimates of error rates and checkpoint frequencies, the benefit of comparing digests of intermediate checkpoints is significant, and is even greater for higher probabilities of error or for longer computations with checkpoints. 8 (a) As a function of probability of error (p) Figure 1. 1 20 40 60 80 100 120 # of checkpoints 140 160 180 (b) As a function of checkpoint frequency (m) Benefit (W ) relative to maximum time (T ).

C o n f < / u r l > < / arguments> < / grmsjob> There are some attributes required by eNANOS not supported by the GRMS job description language. Thus, it is required to extend the specification of details about parallelism for applications in GRMS. There are basically two different ways: Extending the GJD language Using a mechanism to specify more details with the current semantic We have decided not extending the language used to describe jobs in the GRMS system.

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