LI77515: LONG COMPILE TIME IN XLFENTRY AT -O2

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Compiling an application at optimization level -O2 has a drastic
    increase in compile time as compared to -O0.  The -qphsinfo
    compile timing report shows excess time spent in the FORTRAN
    stage of the compiler, which corresponds to the 'xlfentry'
    component of the compiler.
    

Local fix

  • Compile at -O0
    

Problem summary

  • PROBLEM DESCRIPTION:
    The Fortran component of the compiler may take a long time to
    compile at -O2 and above in cases where the compilation unit
    has a large number of I/O statements.
    
    USERS AFFECTED:
    Users may see this problem if their applications have a large
    number of I/O statements in individual compilation units.  The
    problem is visible at -O2 and above.
    

Problem conclusion

  • An improvement has been made that reduces compile time when -O2
    or above is used.
    

Temporary fix

Comments

APAR Information

  • APAR number

    LI77515

  • Reported component name

    XL FORTRAN FOR

  • Reported component ID

    5799AH100

  • Reported release

    E10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-09-24

  • Closed date

    2013-11-26

  • Last modified date

    2013-11-26

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    IV53301

Fix information

  • Fixed component name

    XL FORTRAN FOR

  • Fixed component ID

    5799AH100

Applicable component levels

  • RE10 PSY

       UP



Rate this page:

(0 users)Average rating

Add comments

Document information


More support for:

XL Fortran for Blue Gene/Q

Software version:

ALL VERSIONS

Reference #:

LI77515

Modified date:

2013-11-26

Translate my page

Machine Translation

Content navigation