A memory deficit can be overcome in one of two ways:
- Reduction of the AME factor and thus reduction of the extended memory.
- Maintaining the expanded memory size by reducing the AME factor and adding additional memory to compensate.
With the above-mentioned monitoring tools, the detection of a memory deficit is very easy, here e.g. the command lparstat with the option “-c” (compression):
aix22 # lparstat -c 1
System configuration: type=Shared mode=Uncapped mmode=Ded-E smt=4 lcpu=16 mem=32512MB tmem=29696MB psize=16 ent=2.00
%user %sys %wait %idle physc %entc lbusy vcsw phint %xcpu xphysc dxm
----- ----- ------ ------ ----- ----- ------ ----- ----- ------ ------ ------
31.3 1.8 0.0 66.9 1.14 57.2 12.1 1654 0 0.0 0.0000 0
30.8 1.6 0.0 67.6 1.13 56.3 11.7 1625 0 0.0 0.0000 0
31.5 1.7 0.0 66.8 1.14 57.0 12.0 1715 0 0.0 0.0000 0
57.1 1.5 0.0 41.4 1.95 97.7 8.4 1789 0 0.0 0.0000 0
32.2 1.7 0.0 66.0 1.20 60.2 8.7 1889 0 0.0 0.0000 0
^C
aix22 #
The columns %xcpu, xphysc and dxm are interesting here:
- %xcpu: percentage of CPU resources used for AME
- xphysc: consumption of physical processors for AME
- dxm: size of the memory deficit in MB
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