IBM Support

PI87929: DIRECTORY ENUMERATION PERFORMANCE CAN DEGRADE IN DYNAMIC VIEWS IN LARGE DIRECTORIES AS THE THE AVERAGE FILENAME SIZE INCREASES

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APAR status

  • Closed as program error.

Error description

  • When enumerating directories in an IBM Rational ClearCase
    dynamic view, if there are a large number of directory entries,
    and those directory entries have unusually long names, the MVFS
    may need to reissue requests to the VOB database to collect
    entries that previously been collected.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users of ClearCase dynamic views on Linux, if accessing      *
    * directories containing large numbers of files and/or files   *
    * with unusually long file names.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * When performing actions which enumerate the contents of      *
    * directories, performance of those actions can degrade in     *
    * dynamic views on Linux systems, in large directories as the  *
    * average length of file names increases.                      *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    

Problem conclusion

  • A performance improvement in the functions used for enumerating
    directory contents on Linux has been implemented in ClearCase
    versions 8.0.1.16, 9.0.0.6, and 9.0.1.2.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI87929

  • Reported component name

    CLEARCASE WIN

  • Reported component ID

    5724G2900

  • Reported release

    801

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-09-26

  • Closed date

    2017-12-18

  • Last modified date

    2017-12-18

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

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

Fix information

  • Fixed component name

    CLEARCASE WIN

  • Fixed component ID

    5724G2900

Applicable component levels

  • R801 PSY

       UP

  • R900 PSY

       UP

  • R901 PSY

       UP

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Document Information

Modified date:
16 June 2021