HP Caliper User Guide Release 5.5 (5900-2351, August 2012)

Example
To produce a flat profile based on execution stalls due to GR/GR or GR/load:
$ caliper cycles -ra -s 100000,5%,BE_EXE_BUBBLE.GRALL
--etb-freeze-delay 12 --etb-walkback-cycles 22
Choosing correct values for the --etb-freeze-delay and --etb-walkback-cycles options
requires knowledge of the Integrity servers dual-core Itanium 2 or Itanium 9300 quad-core processor
pipeline. For information about the ETB and how it is configured to collect IP values, see Performance
Profiling for Fun and Profit.
--etb-walkback-cycles
--etb-walkback-cycles integer
Controls the number of cycles to walk back when iterating from the most recent execution trace
buffer (ETB) entry to the oldest ETB entry.
Use this option to change the way in which HP Caliper picks the instruction pointer (IP) samples
from the 16 IP entries in an ETB sample. When iterating from the most recent entry, HP Caliper
computes the cumulative elapsed cycles by adding up each entry's bubble cycles plus one cycle
per entry. When an entry is reached for which the cumulative elapsed cycles is greater than or
equal to the integer specified in this option, that entry is picked as the IP sample.
For more information and an example, see “--etb-freeze-delay” (p. 59).
--event-defaults
--event-defaults [privilege-level-mask=level][:threshold=int]
Controls where and when HP Caliper measures events while your application is executing. You
can use this option to set the default privilege level for all PMU events (including the sampling
event).
privilege-level-mask=level Determines the privilege level setting for a given counter.
By default, counters are measured when your application
runs in user space (user) The privilege levels available
are:
• user
• kernel
• all
You can abbreviate this qualifier to PLM. The qualifier is not
case-sensitive.
threshold=int An integer value that specifies how HP Caliper counts events.
• If the value is zero, HP Caliper counts all events.
• If the value is greater than zero, HP Caliper counts only
the CPU cycles in which the number of events is greater
than or equal to the value you specify.
The default value is zero.
60 HP Caliper Options