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perf provides <not counted> for multiple fields

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Operating Systems Linux Red Hat perf provides <not counted> for multiple fields
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Old 05-21-2012
perf provides <not counted> for multiple fields
Hi,

I am trying to find the number of cache misses that are caused by my code. The best way I could find was to use the perf command. After running command: perf stat dd if=/dev/zero of=/dev/null count=100, the output I got is:

Code:
1.812057  task-clock-msecs         #      0.876 CPUs 
              0  context-switches         #      0.000 M/sec
              0  CPU-migrations           #      0.000 M/sec
            216  page-faults              #      0.119 M/sec
  <not counted>  cycles                  
  <not counted>  instructions            
  <not counted>  cache-references        
  <not counted>  cache-misses

I actually want to know the #cache-misses, which is not counted. I tried specifying the event: perf stat -e cache-misses dd if=/dev/zero of=/dev/null count=100, but the same results (not counted).

It will be great if someone can help me to find the cache-misses for my code.

Thanks as always!
Last edited by Scott; 05-21-2012 at 07:01 PM.. Reason: Code tags, please...
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LEARN ABOUT CENTOS

perf-sched

PERF-SCHED(1)							    perf Manual 						     PERF-SCHED(1)

NAME

       perf-sched - Tool to trace/measure scheduler properties (latencies)

SYNOPSIS

       perf sched {record|latency|map|replay|script}

DESCRIPTION

       There are five variants of perf sched:

	   'perf sched record <command>' to record the scheduling events
	   of an arbitrary workload.

	   'perf sched latency' to report the per task scheduling latencies
	   and other scheduling properties of the workload.

	   'perf sched script' to see a detailed trace of the workload that
	    was recorded (aliased to 'perf script' for now).

	   'perf sched replay' to simulate the workload that was recorded
	   via perf sched record. (this is done by starting up mockup threads
	   that mimic the workload based on the events in the trace. These
	   threads can then replay the timings (CPU runtime and sleep patterns)
	   of the workload as it occurred when it was recorded - and can repeat
	   it a number of times, measuring its performance.)

	   'perf sched map' to print a textual context-switching outline of
	   workload captured via perf sched record.  Columns stand for
	   individual CPUs, and the two-letter shortcuts stand for tasks that
	   are running on a CPU. A '*' denotes the CPU that had the event, and
	   a dot signals an idle CPU.

OPTIONS

       -i, --input=<file>
	   Input file name. (default: perf.data unless stdin is a fifo)

       -v, --verbose
	   Be more verbose. (show symbol address, etc)

       -D, --dump-raw-trace=
	   Display verbose dump of the sched data.

SEE ALSO

       perf-record(1)

perf								    06/30/2014							     PERF-SCHED(1)