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E–26 Alpha Architecture Handbook
Disable performance monitoring
DIGITAL UNIX
Input: a0 = 0 Function code value
a1 = arg Argument from Table E–22
OpenVMS Alpha
Input: R16 = 0 Function code value
R17 = arg Argument from Table E–22
Select desired events (MUX_SELECT)
DIGITAL UNIX
Input: a0 = 2 Function code value
a1 = arg Argument from Table E–23
OpenVMS Alpha
Input: R16 = 2 Function code value
R17 = arg Argument from Table E–23
Select logging options
DIGITAL UNIX
Input: a0 = 3 Function code value
a1[0] = 1
a1[0] = 0
Log all processes
Log only selected processes
OpenVMS Alpha
Input: R16 = 3 Function code value
R17[0] = 1
R17[0] = 0
Log all processes
Log only selected processes
Read the counters
DIGITAL UNIX
Input: a0 = 5 Function code value
Output: v0 = contents of the counters; see Table E–24
OpenVMS Alpha
Input: R16 = 5 Function code value
Output: R0 = contents of the counters; see Table E–24
Table E–20: OpenVMS Alpha and DIGITAL UNIX Performance Monitoring
Functions
Function Register Usage Comments