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Viewing changes to Development/debugging/profiling/perf.txt

  • Committer: Suren A. Chilingaryan
  • Date: 2015-08-21 03:52:00 UTC
  • Revision ID: csa@suren.me-20150821035200-xu1zh22cqlk2omcq
Profiling

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Development/debugging/profiling/perf.txt
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Events
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======
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    perf list
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Operation modes
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===============
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 perf stat                              Collects statistics
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 perf record                            Record events
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 perf report/annotate                   Report the recorded events
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Usage
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========
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 - Basic statics
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    perf stat -d ./mult_sse_debug 
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    perf stat -d -p PID                                 (until Ctrl+C)
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    perf stat -d -a                                     (system wide)
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 - Analyze stack
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    perf record -e '{instructions}' -g dwarf -a
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 - Hardware events
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    perf stat -e event1,event2 <app>                    (specific events)
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 - Profiling
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    perf record -F 1000 ./mult_sse_debug                (sampling at 1000 Hz)
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    perf report                                         (all samples separately)
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    perf script                                         (better for script processing)
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    perf report -n                                      (standard profile)
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    perf report -n --stdio                              (output to standard output)
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    perf annotate --source                              (mixed with assembler, no other way)
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 - Memory
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    perf mem -t load record <application>               (recording)
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    perf mem -t load report
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    perf mem -t load report --sort mem
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Probes
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======
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 - Instrument the kernel tcp_sendmsg() function
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    perf probe --add tcp_sendmsg
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    perf record -e probe:tcp_sendmsg -ag -- sleep 5
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    perf probe --del tcp_sendmsg
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    perf report
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Examples
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=========
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 perf stat -e 'syscalls:sys_enter_*'                                    Count system calls
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 perf stat -e 'block:*' -a                                              Count block device I/O events
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 perf stat -e L1-dcache-loads,L1-dcache-load-misses,L1-dcache-stores    L1 analyses
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 perf stat -e 'syscalls:sys_enter_*'                                    Count syscalls
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 Memory analysis
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 ===============
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 perf stat -e task-clock,cycles,instructions,cache-references,cache-misses <app>
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