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IRIX 6.5 » Books » Developer »
SpeedShop User's Guide
(document number: 007-3311-011 / published: 2003-08-23)
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Chapter 5. Collecting Data on Machine Resource UsageThis chapter describes how to collect machine resource usage data using
the SpeedShop ssusage(1) command. Finding out
the machine resources that your program uses can help you identify performance
bottlenecks and determine which performance experiments you need to run. You
can use the list in “Gathering and Analyzing Performance Data” in Chapter 1, to identify which experiments
to run, based on the results of running ssusage on your
program.
The ssusage command has no options of its own. It
takes the following form:
ssusage executable_name [executable_args] |
executable_name: name of the executable
for which you want to collect machine resource usage data.
executable_args: arguments
to your executable, if any
The ssusage command prints output to stderr
. For example, the ssusage generic command provides
output similar to the following:
...
22.03 real, 18.18 user, 0.21 sys, 7 majf, 120 minf, 0 sw, 241 rb, 0
wb, 135 vcx, 648 icx, 976 mxrss |
The last two lines of the output constitute the machine resource usage
information that ssusage provides. Following is a description
of each field from the report:
real: the real, or wall-clock, time in
which the executable ran, in seconds.
user: user CPU time, excluding the time
the operating system was performing services for the executable, in seconds.
sys: system CPU time, during which the
system was performing services for the executable, in seconds.
majf: major page faults that cause physical
I/O.
minf: minor page faults that require mapping
only.
sw: process swaps.
rb/wb: physical blocks read or written.
These are attributed to the process that first requests a block, but they
do not necessarily directly correlate with the process's own I/O operations.
vcx: voluntary context switches; those
caused by the process's own actions.
icx: involuntary context switches; those
caused by the scheduler.
mxrss: maximum resident set size of the
program, including any shared pages, in kilobytes.
If the program terminates abnormally, a message is printed before the
usage line.
SpeedShop User's Guide
(document number: 007-3311-011 / published: 2003-08-23)
table of contents | additional info | download
Front Matter
New Features in this Guide
About This Guide
Chapter 1. Introduction to Performance Analysis
Chapter 2. Tutorial for C Users
Chapter 3. Tutorial for Fortran Users
Chapter 4. Experiment Types
Chapter 5. Collecting Data on Machine Resource Usage
Chapter 6. Setting Up and Running Experiments: ssrun
Chapter 7. Analyzing Experiment Results
Chapter 8. Miscellaneous Commands
Glossary
Index
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