IT05004: PCOM: EHLLAPI COPY PRESENTATION SPACE FUNCTION RESPONSE SLOWER IN VERSON 6

PCOMM-6.0.13.0-CHT-refresh-pack
PCOMM-6.0.13.0-Docs_Admin_Aids
PCOMM-6.0.13.0-KOR-refresh-pack
PCOMM-6.0.13.0-CHS-refresh-pack
PCOMM-6.0.13.0-MLS-refresh-pack
PCOMM-6.0.13.0-JAP-refresh-pack
Personal Communications 6.0.13
Personal Communications 6.0.15

APAR status

• Closed as program error.

Error description

• Customer created a monitor tool which uses the Copy
  Presentation Space function in Pcom5.7.6. After upgrade to
  Pcom6.0.1, response of Copy Presentation Space functions
  was slower. They compared the response using the PCOM API trace.
  
  The response of Pcom5.7.6 is about 0 second. But in Pcom6.0.1,
  there is difference for about 0.2 seconds. This difference
  affects the Display sessions. While the tool is working, the
  user sees the screen stop for a moment.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * IBM Personal Communications users with an EHLLAPI            *
  * applications                                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * PCOM users with an EHLLAPI application carrying out "COPY    *
  * PRESENTAION SPACE" operation may notice slow performance.    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  An EHLLAPI application was created to monitor IBM Personal
  Communications emulator screen. The application issues COPY
  PRESENTATION SPACE every 0.5 sec. The application was running
  fine on IBM Personal Communications v5.7; however, after
  migrating to IBM Personal Communications v6.0, the emulator
  operation is being interrupted by the application. For example,
  typeamatic cursor movement stopped periodically. Trace shows
  that EHLLAPI - COPY PRESENTATION SPACE is taking more time (0.x
  sec order). When COPY PRESENTAION SPACE is being done,
  presentation space is locked and operator operation is
  interrupted.
  

Problem conclusion

• Function pcsIsSurrogateChar() was introduced newly in IBM
  Personal Communications 6.0. The functions converts special DBCS
  characters. In this function, translation table is defined
  within local stack area, thus table initialization is done on
  every invocation which causes slow performance. Also the
  function searches the table by simple "for" loop which also
  causes slow performance. This routine is invoked for every DBCS
  character in the screen.
  
  PCSCLIB.DLL has been changed to move the translation table to
  the static area and table initialization code was removed.
  Also table search logic is changed for better performance.
  
  Fix scheduled for PCOM 6.0.13 Refresh Pack
  

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:

Modules/Macros

• PCSCLIB
  

Fix information

• Fixed component name

  PCOMM V5 COMBO-

• Fixed component ID

  5639I7000

Applicable component levels

• R60C PSY

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