XMS

XMS_HANDLES

Function:

Specifies the number of XMS extended memory block (EMB) handles. A handle is used with each XMS EMB. This number is required because XMS pre-allocates all the handle space to be compatible with XMS specifications. This setting should be used only if an application uses a large number of handles.

This setting restricts the number of block handles, thereby reducing memory consumption.

Specifying a large number of handles will increase memory consumption and adversely impact system performance.

The default value of this setting is 32.

At VDM creation only.

None.

XMS_MEMORY_LIMIT

Function:

Specifies the per VDM XMS memory limit. This setting should be used under the same guidelines as described above in XMS_HANDLES. The global limit is the overall maximum XMS memory consumption, and the per-VDM limit is the maximum allowed for each VDM. See also Extended Memory Manager (Initialization) for defining global and per-VDM limit in the CONFIG.SYS.

Specifying a large number may adversely affect system performance.

The default value is 2MB per-VDM.

At VDM creation only.

4096; this specifies a limit for each VDM.

XMS_MINIMUM_HMA

Function:

Specifies the minimum HMA memory request allowed. This setting allows the user to fine tune the XMS. HMA is slightly less than 64KB in size. Only one request can be fulfilled from this area at a time.

If a TSR takes a very small allocation, then it will waste this area for other applications. In such cases a limit can be specified.

The default value is zero, which means all the requests will be allowed.

At VDM creation only.

2048; this sets a limit of 2KB.