tools/pidpersec

#!/usr/bin/python
# vim: ts=8 noet sw=8
#
# pidpersec	Count new processes (via fork).
#		For Linux, uses BCC, eBPF. See .c file.
#
# USAGE: pidpersec
#
# Written as a basic example of counting an event.
#
# Copyright (c) 2015 Brendan Gregg.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 11-Aug-2015	Brendan Gregg	Created this.

from bpf import BPF
from ctypes import c_ushort, c_int, c_ulonglong
from time import sleep, strftime

# load BPF program
b = BPF(src_file = "pidpersec.c")
b.attach_kprobe(event="sched_fork", fn_name="do_count")

# stat indexes
S_COUNT = c_int(1)

# header
print("Tracing... Ctrl-C to end.")

# output
last = 0
while (1):
	try:
		sleep(1)
	except KeyboardInterrupt:
		exit()

	print("%s: PIDs/sec: %d" % (strftime("%H:%M:%S"),
	    (b["stats"][S_COUNT].value)))
	b["stats"].clear()