abap/heap_area_total

[Former Member]

Hi,

While running a job it fails with the below error

======================================================================

A Tue Mar 11 10:01:15 2008

A WP has reached abap/heaplimit = 40000000 bytes

A

A Tue Mar 11 10:05:40 2008

A *** ERROR => User 104418 reached avail. heapsize = 1905 MB: see ST22 [abstor.c 1681]

A *** ERROR => Increase abap/heap_area_total [abstor.c 1682]

A *** ERROR => heap memory WP0: 1905 MB [abstor.c 1686]

========================================================================

What is the best option to avoid this error?, changing the parameter values(should not cause page in/out which results in perfomance)?

Currently i have the following values set

============================

abap/heap_area_dia 2000000000

abap/heap_area_nondia 2000000000

abap/heap_area_total 2000000000

abap/heaplimit 40000000

============================

Regards,

Sam

[former_member185954 · Accepted solution]

Hello Cheriyan,

I would recommend tuning the affected program instead alongwith memory tuning. Normally on AIX, we keep more extended memory and lesser heap memory.

Also considering you have 64-Bit AIX.

If you keep extended memory sufficiently large, dialog process do not go into PRIV mode easily and avoid using the heap.

Also accessing extended memory is faster for programs cause it uses memory pointer switching.

Please check the following SAP Note:

Note 191801 - AIX 64-bit with very large amount of Extended Memory

Regards,]

Siddhesh

[vincentlim826]

Are you in 64 bits environment ?

If so, you can consider increase your extended memory in user context, i.e ztta/roll_extension to be > than 2GB, let say 4GB

, and also abap/heap_area_total.

ztta/roll_extension = 4000000000

abap/heap_area_total = 4000000000

What is your OS ? AIX ? There are few couple for SAP Notes to memory managements.

cheers,

Vincent

[Former Member]

Thanks for the reply,

Yes its 64bit env & its AIX 5.2.

can i increase abap/heap_area_total = 4000000000 without increasing ztta/roll_extension?

[vincentlim826]

It is better to increase both, so that the system will utilize the extended memory first, before the utilizing the heap area.

Otherwise, if heap area used up, work process will go into PRIV mode.