Abstract: A method includes identifying a first distributed conversion and control assembly (DCCA) in a central electronics complex (CEC) of a computer system, the CEC containing the first DCCA and a second DCCA, each of the first DCCA and the second DCCA having a flexible service processor (FSP); determining that the computer system satisfies preconditions for concurrent replacement of the first DCCA; disabling control software for a thermal and power management device (TPMD) of the first DCCA; fencing off the first DCCA; depowering the first DCCA; receiving a new media access control (MAC) address of a replacement DCCA; reconfiguring an operating system of the CEC to recognize the new MAC address of the replacement DCCA; powering on the replacement DCCA; removing the fencing off of the first DCCA; and resetting an FSP of the replacement DCCA.

Abstract: A method includes identifying a first distributed conversion and control assembly (DCCA) in a central electronics complex (CEC) of a computer system, the CEC containing the first DCCA and a second DCCA, each of the first DCCA and the second DCCA having a flexible service processor (FSP); determining that the computer system satisfies preconditions for concurrent replacement of the first DCCA; disabling control software for a thermal and power management device (TPMD) of the first DCCA; fencing off the first DCCA; depowering the first DCCA; receiving a new media access control (MAC) address of a replacement DCCA; reconfiguring an operating system of the CEC to recognize the new MAC address of the replacement DCCA; powering on the replacement DCCA; removing the fencing off of the first DCCA; and resetting an FSP of the replacement DCCA.

Abstract: An MPI library including selective I/O agent assignment from among executing tasks, provides improved performance. An MPI job is made up of a number of tasks. I/O operations in an MPI job are performed by tasks assigned as I/O agents. I/O agents are assigned such that the number of tasks assigned as I/O agents are less than the total number of tasks that make up the MPI job. In a dynamic MPI job, I/O agents may be selected from among tasks executing on a lead world or may be spread across multiple worlds. To perform I/O operations initiated by any tasks of an MPI job, including tasks not assigned as I/O agents, the MPI library instantiates worker threads within the tasks assigned as I/O agents. Once the tasks are assigned as I/O agents, identity information of the I/O agents may be stored so that a repeat assignment is not necessary.

Abstract: An MPI library including selective I/O agent assignment from among executing tasks, provides improved performance. An MPI job is made up of a number of tasks. I/O operations in an MPI job are performed by tasks assigned as I/O agents. I/O agents are assigned such that the number of tasks assigned as I/O agents are less than the total number of tasks that make up the MPI job. In a dynamic MPI job, I/O agents may be selected from among tasks executing on a lead world or may be spread across multiple worlds. To perform I/O operations initiated by any tasks of an MPI job, including tasks not assigned as I/O agents, the MPI library instantiates worker threads within the tasks assigned as I/O agents. Once the tasks are assigned as I/O agents, identity information of the I/O agents may be stored so that a repeat assignment is not necessary.