HP Caliper User's Guide

--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. 79).
--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.
Example
Assume that you want to capture samples containing the:
80 HP Caliper Options