root@3bd53e4a7fe4:/# dtrace -n 'lx-syscall::open:entry/execname=="node"/ {  @num[copyinstr(arg0)] = count() }'
dtrace: description 'lx-syscall::open:entry' matched 2 probes
^C

  /tmp/io-file-0.00023033588805110305                               1
  /tmp/io-file-0.00029973264092197915                               1
  /tmp/io-file-0.001082331117725488                                 1
  /tmp/io-file-0.0017028727466004145                                1
  /tmp/io-file-0.00224423432995402                                  1
  /tmp/io-file-0.002446706340221372                                 1
  /tmp/io-file-0.002880551536430742                                 1