DCUF Commands › DCUF USERTRACE › DCUF USERTRACE Usage

DCUF USERTRACE Usage

Trace information maintained in the trace buffer

When you enable the user trace facility, DC/UCF allocates a trace buffer for your user trace session. DC/UCF maintains information about your current trace in that user trace buffer. When the buffer becomes full, DC/UCF writes new entries to the beginning of the buffer, overwriting existing entries. The user trace buffer is released when you sign off from DC/UCF or when you disable the user trace facility.

Size and location of the trace buffer

The location and size of the user trace buffer depends on whether the user trace facility is enabled at system generation time:

• If the user trace facility is enabled at system generation time, the user trace buffer is allocated from the user trace area that is allocated at system startup in DC/UCF region/partition. The size of the user trace buffer also is established at system generation time.
• If the user trace facility is not enabled at system generation time, the user trace buffer is allocated from the storage pool. DC/UCF allocates a minimum trace area of 253 words (or approximately 10 entries).

User trace facility for other terminals

To enable the user trace facility for other terminals, use the USERTRACE option of the DCMT VARY LTERM command.

User trace definition in system generation

You use the USERTRACE parameter of the SYSTEM statement to enable or disable the user trace facility at system generation time.