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@bcantrill
Last active August 20, 2016 13:19
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Running DTrace on Powershell for Linux (!) running inside an LX-branded Ubuntu 14.04 zone on SmartOS
root@1eec2cd3-2cba-e416-e1b6-845b715b736c:~# dtrace -n lx-syscall:::entry'/progenyof($target)/{@[probefunc] = count()}' -c "powershell Get-Process > /dev/null"
dtrace: description 'lx-syscall:::entry' matched 676 probes
dtrace: pid 60025 has exited
arch_prctl 1
exit_group 1
getppid 1
getuid 1
mincore 1
mlock 1
set_tid_address 1
exit 2
getsid 2
mknod 2
setrlimit 2
uname 2
unlink 2
getrusage 3
poll 3
sched_get_priority_max 3
sched_get_priority_min 3
sched_getparam 3
sched_getscheduler 3
sched_setscheduler 3
getcwd 4
madvise 4
getrlimit 5
connect 6
socket 6
readlink 8
pipe 10
ioctl 11
clone 12
set_robust_list 13
rt_sigaction 25
statfs 27
brk 29
access 32
write 42
sched_getaffinity 48
msync 72
dup 77
fcntl 129
sched_yield 151
geteuid 154
openat 203
getdents 204
fstatat64 210
gettid 397
lseek 568
flock 634
close 670
open 700
fstat 790
read 1230
lstat 1465
rt_sigprocmask 2527
futex 3892
munmap 4191
mmap 4387
mprotect 7130
stat 12253
root@1eec2cd3-2cba-e416-e1b6-845b715b736c:~# dtrace -n lx-syscall:::entry'/progenyof($target)/{@[probefunc] = count()}' -c "bash -c ps"
dtrace: description 'lx-syscall:::entry' matched 676 probes
PID TTY TIME CMD
61804 pts/7 00:00:00 ps
61309 pts/7 00:00:00 bash
61248 pts/7 00:00:00 login
61802 pts/7 00:00:00 dtrace
dtrace: pid 61804 has exited
execve 1
exit_group 1
getpeername 1
getpgrp 1
getpid 1
getppid 1
getrlimit 1
openat 1
arch_prctl 2
getdents 2
ioctl 2
lseek 2
readlink 4
rt_sigprocmask 4
uname 4
munmap 5
write 5
getegid 10
getgid 10
getuid 10
geteuid 11
fstat 14
mprotect 15
access 17
brk 18
mmap 31
rt_sigaction 34
stat 62
read 75
close 82
open 95
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Looking at the stat calls in the Powershell invocation shows that it clearly does a lot of work on startup:

dtrace -n lx-syscall::stat:entry'/progenyof($target)/{@[copyinstr(arg0)] = count()}' -c "powershell Get-Process > /dev/null"
dtrace: description 'lx-syscall::stat:entry' matched 2 probes
dtrace: pid 62210 has exited

  /dev/null                                                         1
  /lib/tls                                                          1
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  /opt/microsoft/powershell/6.0.0-alpha.9/System.Net.Http.Native.so                1
  /opt/microsoft/powershell/6.0.0-alpha.9/System.Net.Http.WinHttpHandler.dll                1
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  /opt/microsoft/powershell/6.0.0-alpha.9/System.Net.NameResolution.dll                1
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  /opt/microsoft/powershell/6.0.0-alpha.9/System.ServiceModel.Duplex.dll                1
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  /native/usr/bin/ckdate                                            4
  /native/usr/bin/ckgid                                             4
  /native/usr/bin/ckint                                             4
  /native/usr/bin/ckitem                                            4
  /native/usr/bin/ckkeywd                                           4
  /native/usr/bin/ckpath                                            4
  /native/usr/bin/ckrange                                           4
  /native/usr/bin/ckstr                                             4
  /native/usr/bin/cksum                                             4
  /native/usr/bin/cktime                                            4
  /native/usr/bin/ckuid                                             4
  /native/usr/bin/ckyorn                                            4
  /native/usr/bin/clear                                             4
  /native/usr/bin/cmp                                               4
  /native/usr/bin/col                                               4
  /native/usr/bin/column                                            4
  /native/usr/bin/comm                                              4
  /native/usr/bin/command                                           4
  /native/usr/bin/compress                                          4
  /native/usr/bin/coreadm                                           4
  /native/usr/bin/cp                                                4
  /native/usr/bin/cpio                                              4
  /native/usr/bin/cputrack                                          4
  /native/usr/bin/crle                                              4
  /native/usr/bin/crontab                                           4
  /native/usr/bin/crypt                                             4
  /native/usr/bin/csh                                               4
  /native/usr/bin/csplit                                            4
  /native/usr/bin/ctags                                             4
  /native/usr/bin/ctfdiff                                           4
  /native/usr/bin/ctfdump                                           4
  /native/usr/bin/ctrun                                             4
  /native/usr/bin/ctstat                                            4
  /native/usr/bin/ctwatch                                           4
  /native/usr/bin/curl                                              4
  /native/usr/bin/cut                                               4
  /native/usr/bin/date                                              4
  /native/usr/bin/dc                                                4
  /native/usr/bin/dd                                                4
  /native/usr/bin/decrypt                                           4
  /native/usr/bin/deroff                                            4
  /native/usr/bin/devattr                                           4
  /native/usr/bin/devfree                                           4
  /native/usr/bin/devreserv                                         4
  /native/usr/bin/df                                                4
  /native/usr/bin/dialog                                            4
  /native/usr/bin/diff                                              4
  /native/usr/bin/diff3                                             4
  /native/usr/bin/diffmk                                            4
  /native/usr/bin/digest                                            4
  /native/usr/bin/dircmp                                            4
  /native/usr/bin/dirname                                           4
  /native/usr/bin/dis                                               4
  /native/usr/bin/disk_size                                         4
  /native/usr/bin/diskinfo                                          4
  /native/usr/bin/disklayout                                        4
  /native/usr/bin/disklist                                          4
  /native/usr/bin/diskscan                                          4
  /native/u

@danmack
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danmack commented Aug 19, 2016

Looks a bit different w.r.t stat() on my triton/lxc using 16.04 - maybe they iterated

https://gist.github.com/danmack/a7570a3822525d70d83f4aa07bb4dbd7

@giorgio-v
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Compare and contrast:

root@d046e5c864f4:/# /native/usr/sbin/dtrace -n lx-syscall::stat:entry'/progenyof($target)/{@[copyinstr(arg0)] = count()}' -c "bash -c ps"
dtrace: description 'lx-syscall::stat:entry' matched 2 probes
  PID TTY          TIME CMD
27551 ?        00:00:01 dtrace
27553 ?        00:00:00 ps
dtrace: pid 27553 has exited

  /                                                                 1
  /proc/1                                                           1
  /proc/27551                                                       1
  /proc/27553                                                       1
  /proc/self/task                                                   1
  /sbin/bash                                                        1
  /sbin/ps                                                          1
  /usr/bin/bash                                                     1
  /usr/bin/ps                                                       1
  /usr/local/bin/bash                                               1
  /usr/local/bin/ps                                                 1
  /usr/local/sbin/bash                                              1
  /usr/local/sbin/ps                                                1
  /usr/sbin/bash                                                    1
  /usr/sbin/ps                                                      1
  /dev/pts/1                                                        2
  /dev/zfd/0                                                        2
  .                                                                 3
  /bin/bash                                                         6
  /bin/ps                                                           6

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