scripts: initial DTrace script.

wip-fakessh-exit-status
David Wilson 7 years ago
parent 77f6b31e5c
commit e4bc14b875

@ -0,0 +1,57 @@
#!/usr/bin/env python
# Copyright 2017, David Wilson
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
# may be used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""
Read a CSV produced by profile_ansible.d on stdin and produce a 100ms-precision
series of accumulated CPU time on stdout, with floating point second-resolution
timestamps relative to time of first event.
"""
import collections
import csv
import sys
nanosec = 1e9
precision = 1
c = collections.Counter()
wall = 0
for row in csv.DictReader(sys.stdin):
n = float(row['wall_nsec']) / nanosec
if wall == 0:
wall = n
if row['op'] == 'SCHED':
c[round(n-wall, precision)] += int(row['cpu_nsec'])
wr = csv.writer(sys.stdout)
wr.writerow(['wall', 'cpu'])
total = 0.0
for wall, cpu in sorted(c.iteritems()):
total += cpu
wr.writerow((wall, total))

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