Download Distributed and Parallel Systems: Cluster and Grid Computing by Herbert Rosmanith, Jens Volkert (auth.), Zoltán Juhász, PDF

By Herbert Rosmanith, Jens Volkert (auth.), Zoltán Juhász, Péter Kacsuk, Dieter Kranzlmüller (eds.)

DAPSY (Austrian-Hungarian Workshop on allotted and Parallel structures) is a global convention sequence with biannual occasions devoted to all elements of allotted and parallel computing. DAPSY begun lower than a distinct identify in 1992 (Sopron, Hungary) as nearby assembly of Austrian and Hungarian researchers concentrating on transputer-related parallel computing; a sizzling examine subject of that point. A moment workshop in 1994 (Budapest, Hungary). As transputers turned historical past, the scope of the workshop widened to incorporate parallel and dispensed platforms commonly and the first DAPSYS in 1996 (Miskolc, Hungary) mirrored the result of those changes.

Distributed and Parallel platforms: Cluster and Grid Computing is an edited quantity in line with DAPSYS, 2004, the fifth Austrian-Hungarian Workshop on allotted and Parallel platforms. The workshop was once held along with EuroPVM/MPI-2004, Budapest, Hungary September 19-22, 2004.

Distributed and Parallel structures: Cluster and Grid Computing is designed for a certified viewers, composed of researchers and practitioners in undefined. This publication can be appropriate for graduate-level scholars in desktop science.

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Secondly, stored information values in the I/O status table of the user processes are retrieved, and the I/O request, the ticket number, and the related parameters are sent to the MPI-I/O process. The MPI-I/O process finds an I/O status table which has the same ticket number and retrieves the corresponding parameters. Finally, several parameters and read data are sent to the user processes, and both I/O status tables are deleted and the I/O operation finishes. 50 3. DISTRIBUTED AND PARALLEL SYSTEMS Performance measurement Performance of the MPI-I/O functions using a shared file pointer was measured on interconnected PC clusters using an SCore cluster system [7].

During this test, default stripe size (64 KByte) of the PVFS was selected. In performance measurement of round-trip communication, transfer rate was calculated as (message data size)/(RTT/2), where RTT was a round trip time for ping-pong communication between both clusters. In the remote MPII/O operations, message data was split evenly among the user processes, and they were transfered among user processes and an MPI-I/O process on a remote computer. Message data size was denoted as the whole message data size to be transfered among them.

In this test, TCP_NODELAY option was activated with the help of setsockopt(). Performance results are shown in Figure 3. 7/125 × 100) of the theoretical bandwidth has been achieved. While raw TCP socket connections among PC nodes inside a PC cluster I and II via direct connection using a twisted-pair cross cable achieved up to about 80 MB/s and 112 MB/s, respectively. Thus this low performance was due to poor performance of an on-board Ethernet interface of a PC node in the cluster I. Local I/O operations To evaluate PVFS I/O functions, performance of local I/O operations on the PVFS file system was measured using native PVFS and UNIX I/O functions.

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