Tuesday, April 26, 2011

What is perf command-line on Oracle Linux?

Learned about finding Bottleneck. I just curious perf command-line on Oracle Linux.
perf command-line, what is it? - Performance analysis tools for Linux. It covers hardware level (CPU/PMU, Performance Monitoring Unit) and software features (software counters, tracepoints)
# perf --help

usage: perf [--version] [--help] COMMAND [ARGS]

The most commonly used perf commands are:
annotate Read perf.data (created by perf record) and display annotated code
list List all symbolic event types
record Run a command and record its profile into perf.data
report Read perf.data (created by perf record) and display the profile
sched Tool to trace/measure scheduler properties (latencies)
stat Run a command and gather performance counter statistics
timechart Tool to visualize total system behavior during a workload
top System profiling tool.
trace Read perf.data (created by perf record) and display trace output

See 'perf help COMMAND' for more information on a specific command.
How to use it?
- Record profiles on all CPUs
# perf record -g -a
^C[ perf record: Woken up 54 times to write data ]
[ perf record: Captured and wrote 10.348 MB perf.data (~452130 samples)
- Produce all graph report based on the propfile
# perf report -g
other sample
# perf top
This is something new what I learned from Oracle Linux. However, other command-line (latencytop,...)

2 comments:

rnm1978 said...

by coincidence, I had another article in my RSS reader reader on perf and expanding to some other tools which look interesting too:
http://www.pixelbeat.org/programming/profiling/

Surachart said...

thank you for great information.