Siemens Pyramid Information Systems, Inc.

Fujitsu Siemens Computers Gmbh

Marc Alan Quattromani

Mark S Myers

Jeffery L Moll

In a massively parallel processing (MPP) system, bandwidth efficiency and message packet latency rates are improved by providing routing elements that detect, isolate and identify various routing errors. More specifically, system lock-up, caused by corrupted message packets, can be prevented by analyzing a given sequence of message packet codes and words as they are received by an input buffer associated with a routing element. By analyzing the sequence, it is possible to determine whether a tail code fails to arrive in the prescribed sequence. If a tail code has been received in a way that is inconsistent with an expected sequence, all of the message packet codes and words received at the buffer can be discarded until a valid message packet start code is received.

Torus routing element error handling and self-clearing with missing or extraneous control code feature

In a massively parallel processing (MPP) system, bandwidth efficiency and message packet latency rates are improved by providing routing elements that detect, isolate and identify various routing errors. More specifically, during the transmission of a message packet from a first routing element to a second routing element in the MPP system, link lock-up can be prevented effectively by determining whether the message packet contains a certain predefined quantity of data. Control codes, used for establishing the end to the message packet, can then be inserted into the message packet if it is determined that the message packet does, in fact, contain the predefined quantity of data.

TORUS routing element error handling and self-clearing with link lockup

In a massively parallel processing (MPP) system, data transmission between a first routing element to a buffer in a second routing element can be controlled more efficiently by generating a high and low watermark for the buffer, wherein the watermark values are based on a period of time required to transmit data between the routing elements. The amount of data stored in the buffer is then continuously compared to the high watermark value, and if the amount of data in the buffer is greater than or equal to the high watermark value, the first routing element becomes blocked from transmitting additional data to the buffer in the second routing element.

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Beaverton, OR, United States of America

Marc Alan Quattromani