Configuring Default Memory Allocation Behavior

You can configure RTX's default memory allocation behavior to use local memory or to request memory from Windows. Local memory is a memory pool that RTX can be configured to fulfill RTSS application memory requests. RTSS applications that allocate memory from the local pool don't have to initiate a Service Request Interrupt (SRI) to request memory from Windows. The local memory pool is created when the first RTSS application starts. It provides deterministic behavior for normally non-deterministic functions, as well as greater flexibility and functionality after a system crash (blue screen).

To configure memory allocation settings:

Open RTX Properties in Control Panel and click the Memory tab.

Select an option to configure default memory allocation behavior:

Request from local memory pool configures all RTSS applications to request memory from the RTX local memory pool by default. RTX will create the local memory pool the first time an RTSS application is run.
Request from Windows configures all RTSS applications to request memory from Windows by default. RTX creates the local memory pool the first time someone uses RTSSrun with the /l flag or the first time they run an RTSS application that calls RtAllocateLocalMemory.

Click OK.