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mitogen/scripts/profile_ansible.d

144 lines
4.1 KiB
D

#!/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/
{
self->is_inet = (arg0 == PF_INET);
}
syscall::socket:return
/self->is_inet/
{
self->inet_fds[arg0] = 1;
}
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syscall::close:entry
/execname == SSH/
{
self->inet_fds[arg0] = 0;
}
syscall::write:entry,
syscall::write_nocancel:entry
{
self->fd = arg0;
}
syscall::write:return,
syscall::write_nocancel:return
/self->inet_fds[self->fd] && arg0 > 0/
{
printf("%d,WRITE,%d,,,\n", walltimestamp, arg0);
}
syscall::read:entry,
syscall::read_nocancel:entry
{
self->fd = arg0;
}
syscall::read*:return,
syscall::read_nocancel:return
/self->inet_fds[self->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);
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/* Kernel threads are recycled, variables hang around. */
self->start_vtime = 0;
self->ontime = 0;
}
sched:::on-cpu
/self->start_vtime/
{
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self->ontime = timestamp;
}
sched:::off-cpu
/self->ontime/
{
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printf("%d,SCHED,,%d,%d,%s\n",
walltimestamp,
timestamp - self->ontime,
pid,
execname
);
}