SAP Parameter es/disclaim_coasting_time_free - Control EM usage against operating system


Short text
EM memory release after threshold value exceeded
You can use this group of instance profile parameters (see below) tocontrol the amount of memory released for the operating system dependingon the fill level of the extended memory and thereby minimize theassociated disadvantages. Memory above an adjustable threshold in theextended memory is always released for the operating system. As soon asthis threshold is exceeded, memory below this threshold can also bereleased for the operating system for a specified time period. When EMblocks are released, a definable size of the upper section of the EMblock can also be released for the operating system.
es/disclaim_coasting_time_free determines, in a similar way to theparameter es/disclaim_coasting_time_alloc, how long the system should waitafter the threshold value specified by
es/disclaim_threshold_MB is exceeded when releasing a block beforereleasing the block for the OS.
With high system loads a block released for the SAP system is probablywritten to the swap space, that is, to the hard drive. However, sincethe content is obsolete, it is better from a performance point of viewto release this for the operating system.
See also SAP Note 724140.

Work area
Extended memory

Parameter unit

Who is allowed

Limitation for os

Limitation for db

Other parameter

0 -32000