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公开(公告)号：CA2427278A1
公开(公告)日：2004-10-30
申请号：CA2427278
申请日：2003-04-30
Applicant: IBM CANADA
Inventor： LIND JON A , XUE XUN , KALMUK DAVID C , PEREYRA HEBERT W
IPC: G06F9/445 , G06F9/46 , G06F15/163
Abstract: An operating system directed to using special properties of a common inter- process communications mechanism (IPC), namely UNIX domain socket-pairs or stream- pipes alternatively as a storage medium for file-descriptors of UNIX processes. Wh en a file-descriptor is written into a socket-pair, and closed in the UNIX proces s, the file remains open, but occupies no space in the process file-table. The file-descriptor m ay later be read out of the socket-pair to reestablish it in the file-table, and access it. This property is implemented in an IPC mechanism of UNIX operating system whereby a process such as a dispatcher may manage more connections and processes than its file-table siz e allow. This provides scalability improvements of the UNIX operating system.
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公开(公告)号：CA2310578A1
公开(公告)日：2001-12-02
申请号：CA2310578
申请日：2000-06-02
Applicant: IBM CANADA
Inventor： LEE JESSE , SEE YEUNG-KUEN , SNOWBELL MICHAEL J , PEREYRA HEBERT W , WONG CATHARINA K , BIRD PAUL M , CHAN YUK KUEN
IPC: G06F17/30
Abstract: The invention herein provides a mufti-node relational database management system that can be embodied in software for managing a database having declared temporar y tables associated with respective software application programs, comprising: a plurality of nodes, including: a catalog node for maintaining a list of identification for declared temporary tables associated with any application; a coordinator node for an application; at least one subordinate node for the application, the subordinate node having at least one partition of the declared temporary tables of the application; and a declared temporary table manager for causing the coordinator node to maintain for the application a list of declared temporar y tables.
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公开(公告)号：CA2422252C
公开(公告)日：2008-09-02
申请号：CA2422252
申请日：2003-03-14
Applicant: IBM CANADA
Inventor： KENNEDY JOHN P , PEREYRA HEBERT W , KALMUK DAVID C , WILDING MARK F , HURAS MATTHEW A
Abstract: A reservation system and method for making reservation in a shared memory buffer to store information from applications. The shared memory buffer is logically partitioned in a number of fixed size indexed contiguous slots. The reservation system uses an atomic counter, which is stored in the shared memory buffer. The value of the atomic counter can be associated with the index of a slot available for reservation. An application making a reservation increases the atomic counter value on a number of reserved slots, in order to provide a value that is associated with the index of the next slot available for reservation. After the reservation is accomplished, the information is written into the reserved slots, the reservation system writes parsing information for further parsing, in order to validate information in the shared memory buffer. The reservation system provides functionality for continuous and instantaneous dumping of the shared memory buffer into a file, for cleaning and for wrapping the said buffer.
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Patent Agency Ranking
公开(公告)号：CA2422252A1
公开(公告)日：2004-09-14
申请号：CA2422252
申请日：2003-03-14
Applicant: IBM CANADA
Inventor： KALMUK DAVID C , HURAS MATTHEW A , PEREYRA HEBERT W , WILDING MARK F , KENNEDY JOHN P
Abstract: A reservation system and method for making reservation in a shared memory buffer to store information from applications. The shared memory buffer is logically partitioned in a number of fixed size indexed contiguous slots. The reservation system uses an atomic counter, which is stored in the shared memory buffer. The value of the atomic counter can be associated with the index of a slot available for reservation. An application making a reservation increases the atomic counter value on a number of reserved slots, in order to provide a value that is associated with the index of the next slot available for reservation. After the reservation is accomplished, the information is written into the reserved slots, the reservation system writes parsing information for further parsing, in order to validate information in the shared memory buffer. The reservation system provides functionality for continuous and instantaneous dumping of the shared memory buffer into a file, for cleaning and for wrapping the said buffer.
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公开(公告)号：CA2427278C
公开(公告)日：2009-02-03
申请号：CA2427278
申请日：2003-04-30
Applicant: IBM CANADA
Inventor： XUE XUN , LIND JON A , KALMUK DAVID C , PEREYRA HEBERT W
IPC: G06F15/163 , G06F9/445 , G06F9/46 , G06F9/54
Abstract: An operating system directed to using special properties of a common inter- process communications mechanism (IPC), namely UNIX domain socket-pairs or stream- pipes alternatively as a storage medium for file-descriptors of UNIX processes. Wh en a file-descriptor is written into a socket-pair, and closed in the UNIX proces s, the file remains open, but occupies no space in the process file-table. The file-descriptor m ay later be read out of the socket-pair to reestablish it in the file-table, and access it. This property is implemented in an IPC mechanism of UNIX operating system whereby a process such as a dispatcher may manage more connections and processes than its file-table siz e allow. This provides scalability improvements of the UNIX operating system.
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6.发明专利
公开(公告)号：CA2415043A1
公开(公告)日：2004-06-23
申请号：CA2415043
申请日：2002-12-23
Applicant: IBM CANADA
Inventor： LIND JON A , PEREYRA HEBERT W , KALMUK DAVID C , XUE XUN
IPC: G06F16/176 , G06F17/30 , G06F13/14
Abstract: A communications multiplexor includes dispatcher processes for monitoring client connections. The dispatcher processes detect activity on those connections, and then pass active physical (client) connections to agent processes for servicing. Transfer is done through specific connection queues that are associated with a set of agents. A multi-queuing structure permits pooling of agents on a set of shared resources thereby reducing time require d to switch between different client connections. After an agent has serviced a given connection , the agent returns that connection to the agent's dispatcher (there is a static assignment between connections and dispatchers), and then reads the next unit of work from the agent's associat ed connection queue. This structure may be scalable while allowing optimal performance when passi ng physical connections between processes.
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公开(公告)号：CA2383825A1
公开(公告)日：2003-10-24
申请号：CA2383825
申请日：2002-04-24
Applicant: IBM CANADA
Inventor： NG JACK HON WAI , TRUUVERT KAAREL , GOSS JEFFREY J , XUE XUN , PEREYRA HEBERT W
Abstract: A database management system in which a plurality of nodes form a database instance, each node including a communication manager for dynamically configuring inter-nod al communication resources. The communicaton manager receives communication resource allocati on requests from clients or a self-tuning algorithm. A resource self-tuning mechanism allocat es or de-allocates memory blocks used for communication resource elements dynamically in real time without cycling the instance. Memory blocks are de-allocated asynchronously by placing associated communication resource elements in quarantine until all communication resource elements associated with the memory block are quarantined.
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公开(公告)号：CA2293062A1
公开(公告)日：2001-06-22
申请号：CA2293062
申请日：1999-12-22
Applicant: IBM CANADA
Inventor： VINCENT TIM J , LIND JON A , XUE XUN , SHUM PETER K L , PEREYRA HEBERT W
Abstract: A gateway provides communication of tightly coupled XA transactions to a server hosting a DBMS and makes efficient use of domain socket pairs to implement demultiplexing in the gateway. The gateway includes a TCP/IP listener process which accepts connection requests from a transaction manager. Logical agents represent the application connection a nd are managed by a logical agent scheduler and are passed within the gateway using domain socke t pairs. Gateway agents are dedicated to identified tightly coupled XA transactions to provid e tightly coupled XA transaction support for DBMS systems which do not provide such support directly. The domain socket pairs in the gateway are assigned to logical agent schedulers and are available in a domain socket pool. A wait queue is provided to buffer logical agents when connecti on to the server is not available or where there are no domain socket pairs available in the domain socket pool. The wait queue is itself implemented as a domain socket pair.
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