correlated with the system response. When the system responds quickly, the user is
alert, ready for the next interaction, and thought processes are uninterrupted.
When the system response is poor, the user becomes sluggish.
For interactive environments, a need exists to analyze command usage. Average
execution time of the truly interactive commands can provide data for validation of
the Queue 1 execution time.
Trace Table Recording Facility
The Trace Table Recording Facility provides Field Engineering and system pro
grammers with problem determination capability. The facility, using theCPTRAP command, creates a READER spool file of selected trace table entries, CP data
entries, and virtual machine data entries in the order they happen. ACMS data
reduction program, TRAPRED, is also provided to examine the data collected.Output can be either a spooled print file or an interactive terminal display.
Recording CP Trace Table Entries in the CPTRAP File
The currentCP internal trace table is a 'wrap' table that continuously overlays pre
viously stored information. The trace table recording facility continues to store
trace table entries in the trace table and, in addition, to the spool under command
control. The trace records are selectable by trace type with theCPTRAP com
mand.
Current trace record types are:01 - External interrupt OE - Test I/O 02 - SVC interrupt OF - Halt device 03 - Program interrupt 10 - Unstack 10BLOK or TRQBLOK 04 - Machine check interrupt 11 - NCP BTU 05 - I/O interrupt 12 - Spinning on lock 06 - Free storage 13 - SIGP issued 07 - Return storage 14 -Clear Channel issued 08 - Enter scheduler 15 - IUCV Communication 09 - Queue drop 16 - SNA Console Comm. Services OA - Run user 17 - MSSF Support OB - Start I/O 18 - Start I/O Fast Release OC - Unstack I/O interrupt 19 -Simulated I/O interrupt OD - Virtual CSW store IB - Clear I/O The trace table recording facility allows selection of input by trace table type
(typenum) and further selection based on a field in the trace table entry. The three
allowed fields areVMBLOK address, device address (DEV ADDR) , and code
Performance Observation and Analysis 61
alert, ready for the next interaction, and thought processes are uninterrupted.
When the system response is poor, the user becomes sluggish.
For interactive environments, a need exists to analyze command usage. Average
execution time of the truly interactive commands can provide data for validation of
the Queue 1 execution time.
Trace Table Recording Facility
The Trace Table Recording Facility provides Field Engineering and system pro
grammers with problem determination capability. The facility, using the
entries, and virtual machine data entries in the order they happen. A
reduction program, TRAPRED, is also provided to examine the data collected.
Recording CP Trace Table Entries in the CPTRAP File
The current
viously stored information. The trace table recording facility continues to store
trace table entries in the trace table and, in addition, to the spool under command
control. The trace records are selectable by trace type with the
mand.
Current trace record types are:
(typenum) and further selection based on a field in the trace table entry. The three
allowed fields are
Performance Observation and Analysis 61