INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10

Take for example the following query: 
 
select os_mem_free from sysmaster:sysmachineinfo; 
 
This returns the amount of free memory on the OS in bytes.  We 
appear to get this information from the same function that 
gathers that info for OAT (via the SMI query) and onstat -g osi. 
 
The system call being used appears to be grabbing what is seen 
in svmon -G's "free" column.  (see below)  While this does tend 
to be showing a true value for free memory on the system, it is 
not an accurate representation of the real available free 
memory.  That's because this free value incorporates a lot of 
memory reserved/cached by the OS.  Yet this memory can be 
redistributed to new shared memory segments and process heap 
memory if needed. 
 
> svmon -G 
 
                 size             inuse             free 
pin            virtual          mmode 
memory     65404928    65258049           9272929    11308121 
Ded 
pg space    5373952      28131 
 
               work                 pers        clnt 
other 
pin           7337054           0             1123 
1934752 
in use       11308121         0             53949928 
... 
 
 
A more accurate value for free memory on the system (i.e. memory 
that could be available if needed) would be the (memory->size) - 
(memory->virtual).  Or (memory->size) - (in use->work).

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* USERS AFFECTED:                                              * 
* AIX users                                                    * 
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* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
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* RECOMMENDATION:                                              * 
* Update to IDS-12.10.xC5                                      * 
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Problem Fixed In IDS-12.10.xC5

not known / see Local fix

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

23.09.2014
16.10.2015
16.10.2015