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Memory Analysis

Hi Experts,

ISSUE PART 1

i have created two structures ZTEST_SRC and ZTEST_TRT. The structure ZTEST_TRT contains the same fields as in structure ZTEST_SRC but i have removed the include COMT_TEXT_TEXTDATA in this structure.

      

Technically, as the two structure contains the same fields and length, the memory occupied during run time should be same.

But contrary to the expectations, its not .

I have written a short program to analyze it. Please find the screen shot below.

***************************************************************************************

REPORT  ZTEST_COMPARE_LENGTH.

DATA: SRC TYPE ZTEST_SRC,

       TRT TYPE ZTEST_TRT,

       LO TYPE REF TO CL_ABAP_TYPEDESCR,

       LSRC TYPE  REF TO CL_ABAP_TYPEDESCR,

       LTRT TYPE REF TO CL_ABAP_TYPEDESCR.

DATA: REF_KIND TYPE CHAR10,

       STXH TYPE STXH,

       LINES TYPE COMT_TEXT_LINES_T,

       FUNCTION TYPE TDFUNCTION.

CALL METHOD CL_ABAP_TYPEDESCR=>DESCRIBE_BY_DATA

   EXPORTING

     P_DATA      = SRC

   RECEIVING

     P_DESCR_REF = LSRC.

CALL METHOD CL_ABAP_TYPEDESCR=>DESCRIBE_BY_DATA

   EXPORTING

     P_DATA      = TRT

   RECEIVING

     P_DESCR_REF = LTRT.

BREAK-POINT.


***************************************************************************************************************************


During debugging, the following is the screenshot of the memory analysis.

The bytes occupied by SRC is 912 and TRT is 904.

ISSUE PART 2:

Now i have changed the filed length of the field 'REF_KIND' in both the structures to CHAR80.

 

Now i have execute the program and here is the memory analysis.

Surprised to see that the Bytes occupied are 928 and its same.

Why is memory occupied not the same in ISSUE PART 1 when char70 is used for field REF_KIND as in ISSUE PART 2 ?



Hope I have provided sufficient data for analysis and I need your help in getting to know about it.


Thanks in advance.


Cheers,

Ravi.

'RE

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