Can someone explain how the -C value drops to the -CL value?

Hi all,

sorry if this question is rather silly but Im trying to understand how the system knows when to change the cache from the -C value to the -CL value in Sybase 12.

The official documentation explains this as

-C = "Sets the initial memory reserved for caching database pages and other database server information".

-CL = "Sets a minimum cache size as a lower limit to dynamic cache resizing".

It also states "This option sets a lower limit to the cache. If -c is specified, and -cl is not specified, then the minimum cache size is set to the initial cache size (the -c setting)".

My question is WHEN and HOW does the system know to drop the amount of Cache from the -C to the -CL values?

Example:

-C 6G -CL 2G

Thanks

David