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Status Not under consideration
Categories C/C++
Created by Guest
Created on Apr 23, 2014

Long compile time with -qsmp=omp for non-openmp files

XLC enforces -qhot optimization steps with -qsmp=omp option even for non-OMP source files, making the compile time unnecessarily long for such cases.

The -qsmp=omp compile time issue becomes a dramatic problem because in user's makefile, the option is passed via CXXOPT to all source files, regardless of it containing OMP or not.

A local fix would be to manually disable -qsmp=omp to non-OpenMP source files. Or use -qsmp=omp:noopt to disable optimization steps for faster compilation time in debug builds. This work around degrades performance significantly and shall only be used in non performance sensitive situations.

Idea priority Medium
  • Guest
    Reply
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    Sep 12, 2020

    Hi, we are going through our RFE backlog and this RFE was categorized for BG/Q which is no longer a supported compiler. Please let us know if this is still an issue with the any of the latest Linux compiler; and if so, please open a new RFE against the corresponding version. Thanks.

  • Guest
    Reply
    |
    Sep 14, 2015

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - Programming Languages
    Product - C/C++ Compilers

    For recording keeping, the previous attributes were:
    Brand - Rational
    Product family - Design & development
    Product - C/C++ Compilers

  • Guest
    Reply
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    Jul 25, 2014

    We plan to consider this in a future compiler version. If our strategy changes at any point, we will update the RFE.

  • Guest
    Reply
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    May 20, 2014

    This RFE is consistent with our strategy and product roadmap and IBM is continuing to evaluate.

  • Guest
    Reply
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    Apr 23, 2014

    Attachment (Description): See Use Case.

  • Guest
    Reply
    |
    Apr 23, 2014

    Attachment (Use case): See Use Case