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

Rational Developer for System z Fix Pack 4 (9.0.1.4) for 9.0.1
Rational Developer for System z Fix Pack 5 (9.0.1.5) for 9.0.1
Rational Developer for System z Fix Pack 6 (9.0.1.6) for 9.0.1
Rational Developer for System z Interim Fix 1 for 9.0.1.6
Rational Developer for System z Fix Pack 7 (9.0.1.7) for 9.0.1

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 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