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pidpersec_example.txt

Demonstrations of pidpersec, the Linux bpftrace/eBPF version. Tracing new processes: # ./pidpersec.bt Attaching 4 probes... Tracing new processes... Hit Ctrl-C to end. 22:29:50 PIDs/sec: @: 121 22:29:51 PIDs/sec: @: 120 22:29:52 PIDs/sec: @: 122 22:29:53 PIDs/sec: @: 124 22:29:54 PIDs/sec: @: 123 22:29:55 PIDs/sec: @: 121 22:29:56 PIDs/sec: @: 121 22:29:57 PIDs/sec: @: 121 22:29:58 PIDs/sec: @: 49 22:29:59 PIDs/sec: 22:30:00 PIDs/sec: 22:30:01 PIDs/sec: 22:30:02 PIDs/sec: ^C The output begins by showing a rate of new processes over 120 per second. That then ends at time 22:29:59, and for the next few seconds there are zero new processes per second. The following example shows a Linux build launched at 6:33:40, on a 36 CPU server, with make -j36: # ./pidpersec.bt Attaching 4 probes... Tracing new processes... Hit Ctrl-C to end. 06:33:38 PIDs/sec: 06:33:39 PIDs/sec: 06:33:40 PIDs/sec: @: 2314 06:33:41 PIDs/sec: @: 2517 06:33:42 PIDs/sec: @: 1345 06:33:43 PIDs/sec: @: 1752 06:33:44 PIDs/sec: @: 1744 06:33:45 PIDs/sec: @: 1549 06:33:46 PIDs/sec: @: 1643 06:33:47 PIDs/sec: @: 1487 06:33:48 PIDs/sec: @: 1534 06:33:49 PIDs/sec: @: 1279 06:33:50 PIDs/sec: @: 1392 06:33:51 PIDs/sec: @: 1556 06:33:52 PIDs/sec: @: 1580 06:33:53 PIDs/sec: @: 1944 A Linux kernel build involves launched many thousands of short-lived processes, which can be seen in the above output: a rate of over 1,000 processes per second. There is another version of this tool in bcc: https://github.com/iovisor/bcc

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docroot: /var/www/469ed2f6-4d4b-4a8a-9f5e-ee4ef04d3bc8/public_html

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curdir: /usr/share/doc/bpftrace/examples

	.		4096
	..		4096
X	bashreadline_example.txt		722
X	biolatency_example.txt		1790
X	biosnoop_example.txt		2056
X	biostacks_example.txt		1914
X	bitesize_example.txt		3003
X	capable_example.txt		2659
X	cpuwalk_example.txt		4919
X	dcsnoop_example.txt		4612
X	execsnoop_example.txt		1535
X	gethostlatency_example.txt		923
X	killsnoop_example.txt		846
X	loads_example.txt		864
X	mdflush_example.txt		1866
X	naptime_example.txt		844
X	oomkill_example.txt		1668
X	opensnoop_example.txt		2528
X	pidpersec_example.txt		1504
X	runqlat_example.txt		8632
X	runqlen_example.txt		980
X	setuids_example.txt		2441
X	ssllatency_example.txt		4510
X	sslsnoop_example.txt		1916
X	statsnoop_example.txt		2738
X	swapin_example.txt		549
X	syncsnoop_example.txt		541
X	syscount_example.txt		1144
X	tcpaccept_example.txt		1350
X	tcpconnect_example.txt		1085
X	tcpdrop_example.txt		1256
X	tcplife_example.txt		1597
X	tcpretrans_example.txt		1153
X	tcpsynbl_example.txt		940
X	threadsnoop_example.txt		1182
X	undump_example.txt		680
X	vfscount_example.txt		1199
X	vfsstat_example.txt		929
X	writeback_example.txt		1962
X	xfsdist_example.txt		3419