aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/trace_profile
diff options
context:
space:
mode:
authorjohannst <johannes.stoelp@gmail.com>2020-04-19 22:13:44 +0200
committerjohannst <johannes.stoelp@gmail.com>2020-04-19 22:13:44 +0200
commitfef4d6ff2ad9f48e6dccde0f061453e6a3ac624e (patch)
treec21dfcf8e7c8895a94e1c72cb9588c94794656b1 /src/trace_profile
parent43e402ba2320ced7972d33c9442b2745afe230f6 (diff)
downloadnotes-fef4d6ff2ad9f48e6dccde0f061453e6a3ac624e.tar.gz
notes-fef4d6ff2ad9f48e6dccde0f061453e6a3ac624e.zip
added new hierarchy
Diffstat (limited to 'src/trace_profile')
-rw-r--r--src/trace_profile/README.md1
-rw-r--r--src/trace_profile/ltrace.md17
-rw-r--r--src/trace_profile/oprofile.md14
-rw-r--r--src/trace_profile/perf.md56
-rw-r--r--src/trace_profile/strace.md32
-rw-r--r--src/trace_profile/time.md6
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>
+```