Abstract: Executing an accelerator application program in a hybrid computing environment with a host computer having a host computer architecture; an accelerator having an accelerator architecture, the accelerator architecture optimized, with respect to the host computer architecture, for speed of execution of a particular class of computing functions; the host computer and the accelerator adapted to one another for data communications by a system level message passing module, where executing an accelerator application program on an accelerator includes receiving, from a host application program on the host computer, operating information for an accelerator application program; designating a directory as a CWD for the accelerator application program, separate from any other CWDs of any other applications running on the accelerator; assigning, to the CWD, a name that is unique with respect to names of other CWDs of other applications in the computing environment; and starting the accelerator application program on the a

Abstract: Reducing remote reads of memory in a hybrid computing environment by maintaining remote memory values locally, the hybrid computing environment including a host computer and a plurality of accelerators, the host computer and the accelerators each having local memory shared remotely with the other, including writing to the shared memory of the host computer packets of data representing changes in accelerator memory values, incrementing, in local memory and in remote shared memory on the host computer, a counter value representing the total number of packets written to the host computer, reading by the host computer from the shared memory in the host computer the written data packets, moving the read data to application memory, and incrementing, in both local memory and in remote shared memory on the accelerator, a counter value representing the total number of packets read by the host computer.

Abstract: Data processing in a hybrid computing environment that includes a host computer having a host computer architecture; an accelerator having an accelerator architecture, the accelerator architecture optimized, with respect to the host computer architecture, for speed of execution of a particular class of computing functions; the host computer and the accelerator adapted to one another for data communications by a system level message passing module; and a host application process executing on the host computer. Data processing such a hybrid computing environment includes starting, at the behest of the host application process, a thread of execution on the accelerator; returning, by the system level message passing module to the host application process, a process identifier (‘PID’) for the thread of execution; and managing, by the host application process, the thread of execution on the accelerator as though the thread of execution were a thread of execution on the host computer.

Abstract: A hybrid computing environment in which the host computer allocates, in the shadow memory area of the host computer, a memory region for a packet to be written to the shared memory of an accelerator; writes packet data to the accelerator's shared memory in a memory region corresponding to the allocated memory region; inserts, in a next available element of the accelerator's descriptor array, a descriptor identifying the written packet data; increments the copy of the head pointer of the accelerator's descriptor array maintained on the host computer; and updates a copy of the head pointer of the accelerator's descriptor array maintained on the accelerator with the incremented copy.

Abstract: Executing a service program for an accelerator application program in a hybrid computing environment that includes a host computer and an accelerator, the host computer and the accelerator adapted to one another for data communications by a system level message passing module; where the service program includes a host portion and an accelerator portion and executing a service program for an accelerator includes receiving, from the host portion, operating information for the accelerator portion; starting the accelerator portion on the accelerator; providing, to the accelerator portion, operating information for the accelerator application program; establishing direct data communications between the host portion and the accelerator portion; and, responsive to an instruction communicated directly from the host portion, executing the accelerator application program.

Abstract: Reducing remote reads of memory in a hybrid computing environment by maintaining remote memory values locally, the hybrid computing environment including a host computer and a plurality of accelerators, the host computer and the accelerators each having local memory shared remotely with the other, including writing to the shared memory of the host computer packets of data representing changes in accelerator memory values, incrementing, in local memory and in remote shared memory on the host computer, a counter value representing the total number of packets written to the host computer, reading by the host computer from the shared memory in the host computer the written data packets, moving the read data to application memory, and incrementing, in both local memory and in remote shared memory on the accelerator, a counter value representing the total number of packets read by the host computer.

Abstract: Executing an accelerator application program in a hybrid computing environment with a host computer having a host computer architecture; an accelerator having an accelerator architecture, the accelerator architecture optimized, with respect to the host computer architecture, for speed of execution of a particular class of computing functions; the host computer and the accelerator adapted to one another for data communications by a system level message passing module, where executing an accelerator application program on an accelerator includes receiving, from a host application program on the host computer, operating information for an accelerator application program; designating a directory as a CWD for the accelerator application program, separate from any other CWDs of any other applications running on the accelerator; assigning, to the CWD, a name that is unique with respect to names of other CWDs of other applications in the computing environment; and starting the accelerator application program on the a

Abstract: Data processing in a hybrid computing environment that includes a host computer having a host computer architecture; an accelerator having an accelerator architecture, the accelerator architecture optimized, with respect to the host computer architecture, for speed of execution of a particular class of computing functions; the host computer and the accelerator adapted to one another for data communications by a system level message passing module; and a host application process executing on the host computer. Data processing such a hybrid computing environment includes starting, at the behest of the host application process, a thread of execution on the accelerator; returning, by the system level message passing module to the host application process, a process identifier (‘PID’) for the thread of execution; and managing, by the host application process, the thread of execution on the accelerator as though the thread of execution were a thread of execution on the host computer.

Abstract: Executing a service program for an accelerator application program in a hybrid computing environment that includes a host computer and an accelerator, the host computer and the accelerator adapted to one another for data communications by a system level message passing module; where the service program includes a host portion and an accelerator portion and executing a service program for an accelerator includes receiving, from the host portion, operating information for the accelerator portion; starting the accelerator portion on the accelerator; providing, to the accelerator portion, operating information for the accelerator application program; establishing direct data communications between the host portion and the accelerator portion; and, responsive to an instruction communicated directly from the host portion, executing the accelerator application program.

Abstract: A cut through is provided in a combined router/switch in a data processing system network by having the router store and forward a first portion of a data flow from a source to a destination. The router determines whether the data flow is suitable for cut through. If found suitable, the router sends a redirect protocol to the source, directing the source to use a different destination address for all or part of the remainder of the data flow. The portion of the data flow having new destination address is then cut through the combined router/switch by the switch. If the cut through has a failure, responsibility for the data flow delivery returns to the router. If the destination of a cut through data flow is unavailable, the frames are stored by the switch and forwarded when the destination is available.

Abstract: A mechanism for monitoring and responding to the changes of a local area network (LAN) is disclosed. The automatic configuration mechanism (ACM) of the present invention is initiated as part of the normal "startup" of a network node. Once initialized, the ACM has three functions. First, nodes use the ACM to obtain configuration information from other nodes. Second, nodes use the ACM to provide configuration information to the other nodes of the network. Lastly, nodes use the ACM to respond to other nodes which seek configuration information.