James C Philbin

US Patent:

6496871, Dec 17, 2002

Filed:

Jun 30, 1998

Appl. No.:

09/109412

Inventors:

Suresh Jagannathan - Plainsboro NJ
Richard A. Kelsey - Princeton NJ
James F. Philbin - Metuchen NJ
Satoru Fujita - Tokyo, JP
Kazuya Koyama - Tokyo, JP
Toru Yamanouchi - Tokyo, JP

Assignee:

NEC Research Institute, Inc. - Princeton NJ
NEC Corporation - Tokyo

International Classification:

G06F 954

US Classification:

709317, 709202

Abstract:

A distributed software system and method are provided for use with a plurality of potentially heterogeneous computer machines connected as a network. The system may comprise at least one agent comprising a protection domain, wherein the protection domain of the at least one agent resides on at least two of the plurality of computer machines. A plurality of objects is contained within the protection domain of the at least one agent, a first object residing on a first of the at least two computer machines and a second object residing on a second of the at least two computer machines. The objects are selectively movable among the at least two computer machines by a programmer of the system. The first object on the first computer machine may access the second object on the second computer machine in a location-transparent or network-transparent manner; that is, without knowledge of the physical address of the second object on the second computer machine and regardless of the selective movement of either the first object or the second object among the first and second computer machines. The agent is mobile and may migrate, in whole or in part, to any other machine or machines in the network. Each distributed agent may be distributed among one, several or many of the machines of the network.

US Patent:

57245860, Mar 3, 1998

Filed:

Sep 30, 1996

Appl. No.:

8/724562

Inventors:

Jan Sterling Edler - Plainsboro NJ
Kai Li - Princeton NJ
James F. Philbin - Metuchen NJ

Assignee:

NEC Research Institute, Inc. - Princeton NJ

International Classification:

G06F 946

US Classification:

395672

Abstract:

A method for improving the cache locality of an application executing in a computer system by decomposing the application into one or more threads and subsequently scheduling the execution of the threads such that a next thread to be executed is likely to reside in cache. The method operates by identifying a tour of points through a k-dimensional space such that cache misses are minimized. The space is divided into a plurality of equally sized blocks and may be extended for application to multiple cache levels.

US Patent:

56921934, Nov 25, 1997

Filed:

Mar 31, 1994

Appl. No.:

8/221026

Inventors:

Suresh Jagannathan - Princeton NJ
James F. Philbin - Metuchen NJ

Assignee:

NEC Research Institute, Inc. - Princeton NJ

International Classification:

G06F 1300

US Classification:

395676

Abstract:

A computer software architecture for controlling a highly parallel computer system comprises several layers of abstraction. The first layer is an abstract physical machine which contains a set of abstract physical processors. This layer may be considered as a microkernel. The next layer includes virtual machines and virtual processors. A virtual machine comprises a virtual address space and a set of virtual processors that are connected in a virtual topology. Virtual machines are mapped onto abstract physical machines with each virtual processor mapped onto an abstract physical processor. The third layer of abstraction defines threads. Threads are lightweight processes that run on virtual processors. In a preferred embodiment the abstract physical machines, abstract physical processors, virtual machines, virtual processors, thread groups, and threads are all first class objects.