Example python program for using trace-cruncher to collect performance
statistics of a given process.
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
examples/perf_sampling.py | 51 +++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
create mode 100755 examples/perf_sampling.py
diff --git a/examples/perf_sampling.py b/examples/perf_sampling.py
new file mode 100755
index 0000000..1b57f39
--- /dev/null
+++ b/examples/perf_sampling.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+
+"""
+SPDX-License-Identifier: CC-BY-4.0
+
+Copyright 2022 VMware Inc, Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
+"""
+
+import sys
+import time
+import signal
+
+import tracecruncher.perfpy as perf
+
+def SortKey(sample):
+ return sample.time()
+
+def perf_stop(sig, frame):
+ # Stop collection of performance traces
+ p.stop()
+
+if __name__ == "__main__":
+ if len(sys.argv) < 2:
+ print('Usage: ', sys.argv[0], ' [PROCESS]')
+ sys.exit(1)
+
+ # Create perf sample object for the given process
+ p = perf.sample(pid=int(sys.argv[1]), freq=99)
+ signal.signal(signal.SIGINT, perf_stop)
+ print('Start collecting performance data, press ctrl+c to stop')
+ # Start collecting performance traces
+ p.start()
+ # wait for ctrl+c
+ signal.pause()
+ # Get collected samples
+ samples = p.get_samples()
+ # Sort the list based on the timestamp
+ samples.sort(key=SortKey)
+ time = 0
+ ip_count = 0
+ for s in samples:
+ # Print PID, TID, time and trace depth of each sample
+ if time == 0:
+ time = s.time()
+ print("{0} {1} ({2}), +{3}:".format(s.ip(), s.tid(), s.tid_comm(), s.time() - time))
+ ips = s.stack()
+ ip_count += len(ips)
+ for ip in reversed(ips):
+ # Print stack trace of the sample
+ print("\t{0}".format(ip))
+ print("\nCollected {0} samples, {1} ip traces".format(len(samples), ip_count))
\ No newline at end of file
--
2.34.1
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