scripts: initial DTrace script.
David Wilson
6 years ago
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#!/usr/bin/env python
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# Copyright 2017, David Wilson
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors
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# may be used to endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""
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Read a CSV produced by profile_ansible.d on stdin and produce a 100ms-precision
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series of accumulated CPU time on stdout, with floating point second-resolution
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timestamps relative to time of first event.
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"""
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import collections
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import csv
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import sys
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nanosec = 1e9
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precision = 1
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c = collections.Counter()
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wall = 0
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for row in csv.DictReader(sys.stdin):
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n = float(row['wall_nsec']) / nanosec
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if wall == 0:
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wall = n
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if row['op'] == 'SCHED':
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c[round(n-wall, precision)] += int(row['cpu_nsec'])
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wr = csv.writer(sys.stdout)
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wr.writerow(['wall', 'cpu'])
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total = 0.0
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for wall, cpu in sorted(c.iteritems()):
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total += cpu
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wr.writerow((wall, total))
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@ -0,0 +1,129 @@
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#!/usr/sbin/dtrace -qs
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/*
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* Copyright 2017, David Wilson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* OS X DTrace script to record the CPU time consumed by any python2.7 or SSH
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* process, and the exact read/write sizes to any AF_INET socket opened by an
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* SSH process.
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*
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* This introduces significant tracing overhead of between 5-10%, most likely
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* due to the SCHED events.
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*
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* Produces a CSV file containing columns:
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* - wall_nsec: Nanoseconds wall time.
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* - op: One of START, SCHED, EXIT, READ, WRITE
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* - nbytes: for READ/WRITE, size of AF_INET data read/written
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* - cpu_nsec: for SCHED, nanoseconds spent scheduled.
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* - pid: Process ID.
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* - execname: argv[0]
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*
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* Operations:
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* - START: thread relevant to the trace started up.
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* - EXIT: thread relevant to the trace ended, cpu_nsec contains total
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* time scheduled
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* - SCHED: thread relevant to the trace was scheduled, cpu_nsec contains
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* time spent before it went off-cpu again.
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* - READ: SSH process performed a nbytes read from an AF_INET socket.
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* - WRITE: SSH process performed a nbytes write to an AF_INET socket.
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*/
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inline string SSH = "ssh";
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inline string PYTHON = "python2.7";
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inline int PF_INET = 2;
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dtrace:::BEGIN
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{
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printf("wall_nsec,op,nbytes,cpu_nsec,pid,execname\n");
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}
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syscall::socket:entry
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/execname == SSH && arg0 == PF_INET/
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{
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self->is_inet = 1;
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}
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syscall::socket:return
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/self->is_inet/
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{
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self->inet_fds[arg0] = 1;
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}
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syscall::write*:entry
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/self->inet_fds[arg0]/
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{
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self->write_fd = arg0;
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self->write_nbyte = arg2;
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}
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syscall::write*:return
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/self->write_fd && arg0 > 0/
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{
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printf("%d,WRITE,%d,,,\n", walltimestamp, arg0);
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}
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syscall::read*:entry
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/self->inet_fds[arg0]/
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{
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self->read_fd = arg0;
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}
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syscall::read*:return
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/self->read_fd && arg0 > 0/
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{
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printf("%d,READ,%d,,,\n", walltimestamp, arg0);
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}
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proc:::lwp-start
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/execname == SSH || execname == PYTHON/
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{
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self->start_vtime = vtimestamp;
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printf("%d,START,,,%d,%s\n", walltimestamp, pid, execname);
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}
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proc:::lwp-exit
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/(execname == SSH || execname == PYTHON) && self->start_vtime/
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{
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this->nsecs = vtimestamp - self->start_vtime;
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printf("%d,EXIT,,%d,%d,%s\n", walltimestamp, this->nsecs, pid, execname);
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}
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sched:::on-cpu
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/self->start_vtime/
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{
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self->ontime = vtimestamp;
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}
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sched:::off-cpu
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/self->ontime/
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{
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this->spent = vtimestamp - self->ontime;
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printf("%d,SCHED,,%d,%d,%s\n", walltimestamp, this->spent, pid, execname);
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}
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