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author | johannst <johannes.stoelp@gmail.com> | 2020-04-19 22:13:44 +0200 |
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committer | johannst <johannes.stoelp@gmail.com> | 2020-04-19 22:13:44 +0200 |
commit | fef4d6ff2ad9f48e6dccde0f061453e6a3ac624e (patch) | |
tree | c21dfcf8e7c8895a94e1c72cb9588c94794656b1 /src/trace_profile | |
parent | 43e402ba2320ced7972d33c9442b2745afe230f6 (diff) | |
download | notes-fef4d6ff2ad9f48e6dccde0f061453e6a3ac624e.tar.gz notes-fef4d6ff2ad9f48e6dccde0f061453e6a3ac624e.zip |
added new hierarchy
Diffstat (limited to 'src/trace_profile')
-rw-r--r-- | src/trace_profile/README.md | 1 | ||||
-rw-r--r-- | src/trace_profile/ltrace.md | 17 | ||||
-rw-r--r-- | src/trace_profile/oprofile.md | 14 | ||||
-rw-r--r-- | src/trace_profile/perf.md | 56 | ||||
-rw-r--r-- | src/trace_profile/strace.md | 32 | ||||
-rw-r--r-- | src/trace_profile/time.md | 6 |
6 files changed, 126 insertions, 0 deletions
diff --git a/src/trace_profile/README.md b/src/trace_profile/README.md new file mode 100644 index 0000000..69d120b --- /dev/null +++ b/src/trace_profile/README.md @@ -0,0 +1 @@ +# Trace and Profile diff --git a/src/trace_profile/ltrace.md b/src/trace_profile/ltrace.md new file mode 100644 index 0000000..cfa3fae --- /dev/null +++ b/src/trace_profile/ltrace.md @@ -0,0 +1,17 @@ +# ltrace(1) + +```markdown +ltrace [opts] [prg] + -f .......... follow child processes on fork(2) + -p <pid> .... attach to running process + -o <file> ... log output into <file> + -l <filter> . show who calls into lib matched by <filter> + -C .......... demangle +``` + +# Example + +List which program/libs call into `libstdc++`: +```bash +ltrace -l '*libstdc++*' -C -o ltrace.log ./main +``` diff --git a/src/trace_profile/oprofile.md b/src/trace_profile/oprofile.md new file mode 100644 index 0000000..7d35283 --- /dev/null +++ b/src/trace_profile/oprofile.md @@ -0,0 +1,14 @@ +# [OProfile](https://oprofile.sourceforge.io/) + +```markdown +operf -g -p <pid> + -g ...... caputre call-graph information + +opreport [opt] FILE + show time spent per binary image + -l ...... show time spent per symbol + -c ...... show callgraph information (see below) + -a ...... add column with time spent accumulated over child nodes + +ophelp show supported hw/sw events +``` diff --git a/src/trace_profile/perf.md b/src/trace_profile/perf.md new file mode 100644 index 0000000..57118ed --- /dev/null +++ b/src/trace_profile/perf.md @@ -0,0 +1,56 @@ +# perf(1) + +```markdown +perf list show supported hw/sw events + +perf stat + -p <pid> .. show stats for running process + -I <ms> ... show stats periodically over interval <ms> + -e <ev> ... filter for events + +perf top + -p <pid> .. show stats for running process + -F <hz> ... sampling frequency + -K ........ hide kernel threads + +perf record + -p <pid> ............... record stats for running process + -F <hz> ................ sampling frequency + --call-graph <method> .. [fp, dwarf, lbr] method how to caputre backtrace + fp : use frame-pointer, need to compile with + -fno-omit-frame-pointer + dwarf: use .cfi debug information + lbr : use hardware last branch record facility + -g ..................... short-hand for --call-graph fp + -e <ev> ................ filter for events + +perf report + -n .................... annotate symbols with nr of samples + --stdio ............... report to stdio, if not presen tui mode + -g graph,0.5,caller ... show caller based call chains with value >0.5 +``` + +```markdown +Useful <ev>: + page-faults + minor-faults + major-faults + cpu-cycles` + task-clock +``` + +## [`Flamegraph`](https://github.com/brendangregg/FlameGraph) + +### Flamegraph with single event trace +```markdown +perf record -g -e cpu-cycles -p <pid> +perf script | FlameGraph/stackcollapse-perf.pl | FlameGraph/flamegraph.pl > cycles-flamegraph.svg +``` + +### Flamegraph with multiple event traces +```markdown +perf record -g -e cpu-cycles,page-faults -p <pid> +perf script --per-event-dump +# fold & generate as above +``` + diff --git a/src/trace_profile/strace.md b/src/trace_profile/strace.md new file mode 100644 index 0000000..34abf3b --- /dev/null +++ b/src/trace_profile/strace.md @@ -0,0 +1,32 @@ +# strace(1) + +```markdown +strace [opts] [prg] + -f .......... follow child processes on fork(2) + -p <pid> .... attach to running process + -s <size> ... max string size, truncate of longer (default: 32) + -e <expr> ... expression for trace filtering + -o <file> ... log output into <file> + -c .......... dump syscall statitics at the end +``` + +```markdown +<expr>: + trace=syscall[,syscall] .... trace only syscall listed + trace=file ................. trace all syscall that take a filename as arg + trace=process .............. trace process management related syscalls + trace=signal ............... trace signal related syscalls + signal ..................... trace signals delivered to the process +``` + +# Examples + +Trace `open(2)` & `socket(2)` syscalls for a running process + child processes: +```markdown +strace -f -e trace=open,socket -p <pid> +``` + +Trace signals delivered to a running process: +```markdown +strace -f -e signal -p <pid> +``` diff --git a/src/trace_profile/time.md b/src/trace_profile/time.md new file mode 100644 index 0000000..be404fb --- /dev/null +++ b/src/trace_profile/time.md @@ -0,0 +1,6 @@ +# /usr/bin/time(1) + +```markdown +# statistics of process run +/usr/bin/time -v <cmd> +``` |