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PERFORMANCE OF A SPECULATIVE TRANSMISSION SCHEME FOR SCHEDULING LATENCY REDUCTION
#1

[attachment=3145]

Performance of a Speculative Transmission Scheme for Scheduling-Latency Reduction

Project Team Members:

C.Dinesh (51206104014)
K.Selvaraj (51206104327)
S.Elumalai (51206104307)
N.Periyasamy (51206104320)





Abstract

Latency is the amount of time a message takes to traverse a system.
Low latency is a critical requirement in some switching applications , specifically in parallel computer interconnection networks.
In this latency comprises two components, namely.
Control-path latency
Data-path latency
We introduce a speculative transmission scheme to significantly reduce the average control-path latency by allowing cells to proceed without waiting for a grant, under certain conditions.
the control-path latency can be almost entirely eliminated for loads up to 50%

OBJECTIVE

The component of parallel computing systems is the interconnection network (ICTN).
To achieve a good system balance between computation and communication,
The ICTN must provide low latency, bandwidth, low error rates, and scalability, node with low latency being the most important requirement.
Index Terms:

Arbiters

electrooptic switches
modeling
packet
Switching
scheduling.
Existing System:


Control and data path-latencies comprise serialization and de-serialization delays, propagation delay, processing delay between request and response.

Proposed System


We propose a novel method to combine speculative and scheduled transmission in a cross bar switch.
Speculative modes of operation reduced latency at low utilization.
Scheduled modes of operation achieve high maximum throughput.

System Requirements:
Hardware:


PROCESSOR : PENTIUM IV 2.6 GHz
RAM : 512 MB DD RAM
MONITOR : 15 COLOR
HARD DISK : 20 GB
CDDRIVE : LG 52X
KEYBOARD : STANDARD 102 KEYS
MOUSE : 3 BUTTONS


Software:

Tools Used : JFrameBuilder
Operating System : Window s XP
Back End : SQL Server 2000
Front End : Java, Swing
ADVANTAGES


The speculative transmission that does not have to wait for grant hence low latency.

The scheduled transmission achieve high maximum throughput.

Bibliography or References

[1] R. Hemenway, R. Grzybowski, C. Minkenberg, and R. Luijten, Optical-packet-switched interconnect for supercomputer applications,OSA J. Opt. Netw., vol. 3, no. 12, pp. 900 913, Dec. 2004.
[2] C. Minkenberg, F. Abel, P. M ller, R. Krishnamurthy, M. Gusat, P.Dill, I. Iliadis, R. Luijten, B. R. Hemenway, R. Grzybowski, and E.Schiattarella, Designing a crossbar scheduler for HPC applications,IEE Micro, vol. 26, no. 3, pp. 58 71, May/Jun. 2006.
[3] E. Oki, R. Rojas-Cessa, and H. Chao, A pipeline-based approach formaximal-sized matching scheduling in input-buffered switches, IEE Commun. Lett., vol. 5, no. 6, pp. 263 265, Jun. 2001.
[4] C. Minkenberg, I. Iliadis, and F. Abel, Low-latency pipelined crossbar arbitration, in Proc. IEE GLOBECOM 2004, Dallas, TX, Dec. 2004, vol. 2, pp. 1174 1179.
[5] C. Minkenberg, R. Luijten, F. Abel, W. Denzel, and M. Gusat, Current issues in packet switch design, ACM Comput. Commun. Rev., vol. 33, no. 1, pp. 119 124, Jan. 2003.
[6] C. Minkenberg, F. Abel, P. M ller, R. Krishnamurthy, and M. Gusat,Control path implementation of a low-latency optical HPC switch, inProc. Hot Interconnects 13, Stanford, CA, Aug. 2005, pp. 29 35.
[7] C.-S. Chang, D.-S. Lee, and Y.-S. Jou, Load-balanced Birkhoff-von Neumann switches, part I: One-stage buffering, Elsevier Comput.Commun., vol. 25, pp. 611 622, 2002.
[8] A. Tanenbaum, Computer Networks, 3rd ed. Englewood Cliffs, NJ: Prentice Hall, 1996.
[9] R. Krishnamurthy and P. M ller, An input queuing implementation for low-latency speculative optical switches, in Proc. 2007 Int. Conf.Parallel Processing Techniques and Applications (PDPTA 07), Las Vegas, NV, Jun. 2007, vol. 1, pp. 161 167.
[10] H. Takagi, Queueing Analysis, Volume 3: Discrete-Time Systems. Amsterdam: North-Holland, 1993.

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#2
PERFORMANCE OF A SPECULATIVE TRANSMISSION SCHEME FOR SCHEDULING LATENCY REDUCTION

Abstract: This work was motivated by the need to achieve low latency in an input centrally-scheduled cell switch for high-performance computing applications; specifically, the aim is to reduce the latency incurred between issuance of a request and arrival of the corresponding grant. We introduce a speculative transmission scheme to significantly reduce the average latency by allowing cells to proceed without waiting for a grant. It operates in conjunction with any centralized matching algorithm to achieve a high maximum utilization. An analytical model is presented to investigate the efficiency of the speculative transmission scheme employed in a non-blocking N*NR input-queued crossbar switch with receivers R per output. The results demonstrate that the can be almost entirely eliminated for loads up to 50%. Our simulations confirm the analytical results.
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#3

i need future enhancement for this project could u plzz help me out
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