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.

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.

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.

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

IPC: G06F12/02 ,  G06F9/46 ,  G06F9/50 ,  G06F12/00 ,  G06F13/42

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.

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

IPC: G06F9/46 ,  G06F9/50 ,  G06F12/00 ,  G06F12/02 ,  G06F13/42

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.