Controlling Access To A Resource In A Distributed Computing System With A Distributed Access Request Queue

a distributed computing system and resource technology, applied in computing, digital computers, instruments, etc., can solve the problems of limiting the potential speed of serial processors, and affecting the performance of the computer system

Inactive Publication Date: 2011-09-15
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]For each of the other receiving nodes, controlling access to the resource includes returning, to the requesting node, as a result of the reduction operation, a value other than the requesting node's unique node identifier. Returning a value other than the requesting node's unique node identifier includes storing a predefined value in the source data buffer a...

Problems solved by technology

Since that time, computer systems have evolved into extremely complicated devices.
It is far more difficult to construct a computer with a single fast processor than one with many slow processors with the same throughput.
There are also certain theoretical limits to the potential speed of serial processors.
After that point adding more processors does not yield any more throughput but only increases the overhead and cost.
Shared memory processing needs additional locking for the data and imposes the overhead of additional processor and bus cycles and also serializes some portion of the algorithm.
Message passing processing uses high-speed data communications networks and message buffers, but this communication adds transfer overhead on the data communications networks as well as additional memory need for message buffers and latency in...

Method used

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  • Controlling Access To A Resource In A Distributed Computing System With A Distributed Access Request Queue
  • Controlling Access To A Resource In A Distributed Computing System With A Distributed Access Request Queue
  • Controlling Access To A Resource In A Distributed Computing System With A Distributed Access Request Queue

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Embodiment Construction

[0029]Exemplary methods, apparatus, and products for controlling access to a resource in a distributed computing system in accordance with embodiments of the present invention are described with reference to the accompanying drawings, beginning with FIG. 1. FIG. 1 illustrates an exemplary distributed computing system for controlling access to a resource according to embodiments of the present invention. The system of FIG. 1 includes a parallel computer (100), non-volatile memory for the computer in the form of data storage device (118), an output device for the computer in the form of printer (120), and an input / output device for the computer in the form of computer terminal (122). Parallel computer (100) in the example of FIG. 1 includes a plurality of compute nodes (102).

[0030]The compute nodes (102) are coupled for data communications by several independent data communications networks including a Joint Test Action Group (‘JTAG’) network (104), a global combining network (106) wh...

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PUM

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Abstract

Controlling access to a resource in a distributed computing system that includes nodes having a status field, a next field, a source data buffer, and that are characterized by a unique node identifier, where controlling access includes receiving a request for access to the resource implemented as an active message that includes the requesting node's unique node identifier, the value stored in the requesting node's source data buffer, and an instruction to perform a reduction operation with the value stored in the requesting node's source data buffer and the value stored in the receiving node's source data buffer; returning the requesting node's unique node identifier as a result of the reduction operation; and updating the status and next fields to identify the requesting node as a next node to have sole access to the resource.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The field of the invention is data processing, or, more specifically, methods, apparatus, and products for controlling access to a resource in a distributed computing system.[0003]2. Description of Related Art[0004]The development of the EDVAC computer system of 1948 is often cited as the beginning of the computer era. Since that time, computer systems have evolved into extremely complicated devices. Today's computers are much more sophisticated than early systems such as the EDVAC. Computer systems typically include a combination of hardware and software components, application programs, operating systems, processors, buses, memory, input / output devices, and so on. As advances in semiconductor processing and computer architecture push the performance of the computer higher and higher, more sophisticated computer software has evolved to take advantage of the higher performance of the hardware, resulting in computer syst...

Claims

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Application Information

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IPC IPC(8): G06F15/16
CPCG06F15/17306G06F9/526
Inventor ARCHER, CHARLES J.CAREY, JAMES E.MARKLAND, MATTHEW W.SANDERS, PHILIP J.
Owner IBM CORP
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