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PI21512: RDZ 9.0.1 SERVER PERFORMANCE DEGRADATION COMPARED TO RDZ 8.5.1 WHEN RUNNING ON ZPD&T

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APAR status

  • Closed as program error.

Error description

  • Rational Developer for System z suffers from performance
    degradation when running on zPD&T after the z/OS server upgraded
    from RDz 8.5.1 to RDz 9.0.1. This happens with test usage
    scenario's that generates a lot of request of LISTDS, ALLOCATE,
    compile, and file update for RDz server. The server receives the
    same type of requests from multiple users in very close timing.
    
    In the traces can be observed that the trace entries for
    multiple requests appear mixed in RDz 9.0.1. TSO command
    execution takes long time but does not indicate that the TSO
    command server acts significant different between these two
    versions.
    
    This can result in CRRZI0379E Time out, no response from the
    server
    

Local fix

Problem summary

  • The throughput of RDz 9.0.1 server is slower than that of RDz
    8.5.1, when running on zPD&T with the default server
    configuration.
    

Problem conclusion

  • Just to be as the RDz 8.5.1 server, disabling the sprit function
    on RDz 9.0.1 or later server should be enough.
    On the other hand, the spirit function should reduce the risk
    for server to fall into 'out of memory error' condition. Keeping
    the spirit function enabled,  SPIRIT_INTERVAL_TIME and
    SPIRIT_EXPIRY_TIME parameters may be set to large values not to
    let the spirit function logic to work frequently.
    SPIRIT_INTERVAL_TIME indicates the time in seconds to wait
    before attempting to spirit elements on the queue to be spirited
    while SPIRIT_EXPIRY_TIME indicates how long to wait after
    queuing an element for spiriting before following through.
    The appropriate values should depend on how server is used.
    
    The problem listed in this APAR has been resolved with
    IBM Rational Developer for System z V9.0.1.4 Fix Pack which
    is available from the Recommended Fixes support download page:
    http://www-1.ibm.com/support/docview.wss?rs=2294&uid=swg27006335
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI21512

  • Reported component name

    RD/Z HOST

  • Reported component ID

    5724T0723

  • Reported release

    900

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-07-08

  • Closed date

    2015-06-04

  • Last modified date

    2015-06-04

  • 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

    RD/Z HOST

  • Fixed component ID

    5724T0723

Applicable component levels

  • R900 PSY

       UP



Document information

More support for: Rational Developer for System z

Software version: 9.0

Reference #: PI21512

Modified date: 04 June 2015