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Former Member
May 08, 2010 at 12:49 PM

SAP and memory Management

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Hi Experts,

I have gone through Memory management link on help.sap.com, but i have un-resolved doubts , so i guess you people could help me.

In ST06 there is Physical Memory and Swap . IS it equivalent to Shared Mem+local Mem = Physical + Swap?

In ST02 there is tab storage : In that

there is a line Virtual memory allocated total ............KB

Is this total memory allocated to SAP ? and is it allocated from Physical+Swap or only Physical?

Size of extended memory ..........KB . Is this too allocated from Physical+Swap or only Physical or only Swap ?

parameter em/initial_size_MB i think only limits the total usage of extended memory by all wp , am i right?

If yes then this parameter can be increased till amount of physical or physical+swap?

At OS level i hit command Top and i checked mem utilization for my session...it was 7GB

3 ? 2874 root 154 20 7848K 820K sleep 313:44 0.17 0.17 sendmail:

3 ? 6605 sidadm 155 20 7674M 178M sleep 168:22 0.17 0.17 dw.sapSID_DVEBMGS$$

I checked in SM04 and data obviously did not match as the EM usgae was just 10MB(10.039.740 B).

So i guess at OS the memory allocated to shared pools + user storage (ST02) is also considered?

Regards,

Ameya

Regards,

Ameya

Edited by: Ameya Joshi on May 8, 2010 3:09 PM