Size of the virtual portion of shared memory

Use configuration parameters to specify the initial size of the virtual portion of shared memory, the size of segments to be added later, and the amount of memory available for PDQ queries.

To specify the initial size of the virtual shared-memory portion, set the SHMVIRTSIZE configuration parameter. To specify the size of segments that are added later to the virtual shared memory, set the SHMADD and the EXTSHMADD configuration parameter.

To specify the amount of memory available for PDQ queries, set the DS_TOTAL_MEMORY parameter.

If you want to increase the amount of memory that is available for a query that is not a PDQ query and the PDQ priority is set to 0 (zero), you can change the amount in any of the following ways:
  • Set the DS_NONPDQ_QUERY_MEM configuration parameter
  • Run the onmode -wm or the onmode -wf command
For example, if you use the onmode utility, specify a value as shown in the following example:
onmode -wf DS_NONPDQ_QUERY_MEM=500
The minimum value for DS_NONPDQ_QUERY_MEM is 128 KB. The maximum supported value is 25 percent of the value of DS_TOTAL_MEMORY.

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