Runtime checking of datatype signatures in MPI

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The MPI standard provides a way to send and receive complex combinations of datatypes (e.g., integers and doubles) with a single communication operation. The MPI standard specifies that the type signature, that is, the basic datatypes (language-defined types such as int or DOUBLE PRECISION), must match in communication operations such as send/receive or broadcast. Because datatypes may be defined by the user in MPI, there is a limitless collection of possible type signatures. Detecting the programmer error of mismatched datatypes is difficult in this case; detecting all errors essentially requires sending a complete description of the type signature with a ... continued below

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8 pages

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Gropp, W. D. June 19, 2000.

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Description

The MPI standard provides a way to send and receive complex combinations of datatypes (e.g., integers and doubles) with a single communication operation. The MPI standard specifies that the type signature, that is, the basic datatypes (language-defined types such as int or DOUBLE PRECISION), must match in communication operations such as send/receive or broadcast. Because datatypes may be defined by the user in MPI, there is a limitless collection of possible type signatures. Detecting the programmer error of mismatched datatypes is difficult in this case; detecting all errors essentially requires sending a complete description of the type signature with a message. This paper discusses an alternative: send the value of a function of the type signature so that (a) identical type signatures always give the same function value, (b) different type signatures often give different values, and (c) common cases (e.g., predefined datatypes) are handled exactly. Thus, erroneous programs are often (but not always) detected; correct programs never are flagged as erroneous. The method described is relatively inexpensive to compute and uses a small (and fixed, independent of the complexity of the datatype) amount of space in the message envelope.

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8 pages

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  • EuroPVM/MPI 2000, Balatonfuered (HU), 09/10/2000--09/13/2000; Other Information: PBD: 19 Jun 2000; PBD: 19 Jun 2000

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  • Report No.: ANL/MCS/CP-102127
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 757553
  • Archival Resource Key: ark:/67531/metadc709457

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  • June 19, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • March 23, 2016, 3:35 p.m.

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Gropp, W. D. Runtime checking of datatype signatures in MPI, article, June 19, 2000; Illinois. (digital.library.unt.edu/ark:/67531/metadc709457/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.