Administering truncated receive functions in a parallel messaging interface

• US 8,909,716 B2
• Filed: 09/28/2010
• Issued: 12/09/2014
• Est. Priority Date: 09/28/2010
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Archer, Charles J., Blocksome, Michael A., Ratterman, Joseph D., Smith, Brian E.
• Primary Examiner(s): Nguyen, Thuong
• Application Number:
  US12/892,153
• Publication Number:
  US 20120079035A1
• Time in Patent Office: 1,533 Days
• Field of Search: 709/206, 709/230, 370/401, 711/173
• US Class Current: 709/206
• CPC Class Codes: G06F 15/16 Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs coordinating program control therefor G06F9/52; in regulating and control system G05B

Abstract

Administering truncated receive functions in a parallel messaging interface (‘PMI’) of a parallel computer comprising a plurality of compute nodes coupled for data communications through the PMI and through a data communications network, including: sending, through the PMI on a source compute node, a quantity of data from the source compute node to a destination compute node; specifying, by an application on the destination compute node, a portion of the quantity of data to be received by the application on the destination compute node and a portion of the quantity of data to be discarded; receiving, by the PMI on the destination compute node, all of the quantity of data; providing, by the PMI on the destination compute node to the application on the destination compute node, only the portion of the quantity of data to be received by the application; and discarding, by the PMI on the destination compute node, the portion of the quantity of data to be discarded.

Claims

1. A method of administering truncated receive functions in a parallel messaging interface (‘

PMI’

) of a parallel computer comprising a plurality of compute nodes coupled for data communications through the PMI and through a data communications network, the method comprising;

sending, through the PMI on a source compute node, a quantity of data from the source compute node to a destination compute node;

specifying, by the application on the destination compute node, a portion of the quantity of data to be received by the application on the destination compute node by specifying a beginning of the quantity of data and a portion of the quantity of data to be discarded by the destination compute node by specifying the ending portion of the quantity of the portion, wherein the portion of the quantity of data to be received by the application is a predetermined size;

receiving, by the PMI on the destination compute node, all of the quantity of data;

providing, by the PMI on the destination compute node to the application on the destination compute node, only the portion of the quantity of data to be received by the application by writing the portion of the quantity of data to be received into a receive buffer predefined by the application,

wherein the portion of the quantity of data to be received by the application is a subset of all of the quantity of data, and

wherein the receive buffer is an input buffer for the application that includes data to be processed by the application; and

discarding, by the PMI on the destination compute node, the portion of the quantity of data to be discarded by writing the portion of the quantity of data to be discarded to a predefined throwaway buffer.

2. The method of claim 1 wherein specifying the portion of the quantity of data to be received by the application on the destination compute node and the portion of the quantity of data to be discarded further comprises:

specifying the beginning portion of the quantity of data as the portion of the quantity of data to be received by the application; and

specifying the ending portion of the quantity of data as the portion of the quantity of data to be discarded.

3. The method of claim 1 wherein specifying the portion of the quantity of data to be received by the application on the destination compute node and the portion of the quantity of data to be discarded further comprises:

specifying the ending portion of the quantity of data as the portion of the quantity of data to be received by the application; and

specifying the beginning portion of the quantity of data as the portion of the quantity of data to be discarded.

4. The method of claim 1 wherein specifying the portion of the quantity of data to be received by the application on the destination compute node and the portion of the quantity of data to be discarded further comprises specifying an ordering of one or more portions of the quantity of data to be received by the application, one or more portions of the quantity of data to be discarded, and specifying a length for each portion.

5. The method of claim 1 wherein discarding the portion of the quantity of data to be discarded further comprises writing sub-portions of the quantity of data to be discarded into a predefined throwaway buffer, wherein the size of the throwaway buffer is smaller than the size of the portion of the quantity of data to be discarded.

6. An apparatus for administering truncated receive functions in a parallel messaging interface (‘

PMI’

) of a parallel computer comprising a plurality of compute nodes coupled for data communications through the PMI and through a data communications network, the apparatus comprising a computer processor, a computer memory operatively coupled to the computer processor, the computer memory having disposed within it computer program instructions that, when executed by the computer processor, cause the apparatus to carry out the steps of;

sending, through the PMI on a source compute node, a quantity of data from the source compute node to a destination compute node;

specifying, by the application on the destination compute node, a portion of the quantity of data to be received by the application on the destination compute node by specifying a beginning of the quantity of data and a portion of the quantity of data to be discarded by the destination compute node by specifying the ending portion of the quantity of the portion, wherein the portion of the quantity of data to be received by the application is a predetermined size;

receiving, by the PMI on the destination compute node, all of the quantity of data;

providing, by the PMI on the destination compute node to the application on the destination compute node, only the portion of the quantity of data to be received by the application by writing the portion of the quantity of data to be received into a receive buffer predefined by the application,

wherein the portion of the quantity of data to be received by the application is a subset of all of the quantity of data, and

wherein the receive buffer is an input buffer for the application that includes data to be processed by the application; and

discarding, by the PMI on the destination compute node, the portion of the quantity of data to be discarded by writing the portion of the quantity of data to be discarded to a predefined throwaway buffer.

7. The apparatus of claim 6 wherein specifying the portion of the quantity of data to be received by the application on the destination compute node and the portion of the quantity of data to be discarded further comprises:

specifying the beginning portion of the quantity of data as the portion of the quantity of data to be received by the application; and

specifying the ending portion of the quantity of data as the portion of the quantity of data to be discarded.

8. The apparatus of claim 6 wherein specifying the portion of the quantity of data to be received by the application on the destination compute node and the portion of the quantity of data to be discarded further comprises:

specifying the ending portion of the quantity of data as the portion of the quantity of data to be received by the application; and

specifying the beginning portion of the quantity of data as the portion of the quantity of data to be discarded.

9. The apparatus of claim 6 wherein specifying the portion of the quantity of data to be received by the application on the destination compute node and the portion of the quantity of data to be discarded further comprises specifying an ordering of one or more portions of the quantity of data to be received by the application, one or more portions of the quantity of data to be discarded, and specifying a length for each portion.

10. The apparatus of claim 6 wherein discarding the portion of the quantity of data to be discarded further comprises writing sub-portions of the quantity of data to be discarded into a predefined throwaway buffer, wherein the size of the throwaway buffer is smaller than the size of the portion of the quantity of data to be discarded.

11. A computer program product for administering truncated receive functions in a parallel messaging interface (‘

PMI’

) of a parallel computer comprising a plurality of compute nodes coupled for data communications through the PMI and through a data communications network, the computer program product comprising a computer readable non-transitory storage medium that includes computer program instructions that, when executed, cause a computer to carry out the steps of;

sending, through the PMI on a source compute node, a quantity of data from the source compute node to a destination compute node;

specifying, by the application on the destination compute node, a portion of the quantity of data to be received by the application on the destination compute node by specifying a beginning of the quantity of data and a portion of the quantity of data to be discarded by the destination compute node by specifying the ending portion of the quantity of the portion, wherein the portion of the quantity of data to be received by the application is a first predetermined size;

receiving, by the PMI on the destination compute node, all of the quantity of data;

providing, by the PMI on the destination compute node to the application on the destination compute node, only the portion of the quantity of data to be received by the application by writing the portion of the quantity of data to be received into a receive buffer predefined by the application,

wherein the portion of the quantity of data to be received by the application is a subset of all of the quantity of data, and

wherein the receive buffer is an input buffer for the application that includes data to be processed by the application; and

discarding, by the PMI on the destination compute node, the portion of the quantity of data to be discarded by writing the portion of the quantity of data to be discarded to a predefined throwaway buffer.

12. The computer program product of claim 11 wherein specifying the portion of the quantity of data to be received by the application on the destination compute node and the portion of the quantity of data to be discarded further comprises:

specifying the beginning portion of the quantity of data as the portion of the quantity of data to be received by the application; and

specifying the ending portion of the quantity of data as the portion of the quantity of data to be discarded.

13. The computer program product of claim 11 wherein specifying the portion of the quantity of data to be received by the application on the destination compute node and the portion of the quantity of data to be discarded further comprises:

specifying the ending portion of the quantity of data as the portion of the quantity of data to be received by the application; and

specifying the beginning portion of the quantity of data as the portion of the quantity of data to be discarded.

14. The computer program product of claim 11 wherein specifying the portion of the quantity of data to be received by the application on the destination compute node and the portion of the quantity of data to be discarded further comprises specifying an ordering of one or more portions of the quantity of data to be received by the application, one or more portions of the quantity of data to be discarded, and specifying a length for each portion.

15. The computer program product of claim 11 discarding the portion of the quantity of data to be discarded further comprises writing sub-portions of the quantity of data to be discarded into a predefined throwaway buffer, wherein the size of the throwaway buffer is smaller than the size of the portion of the quantity of data to be discarded.