On smartos ps complains about o option

[fire]

On smartos ps complains about the o option. So this code breaks:

 process.checks :mem_usage, :every => 1.minutes, :below => 750.megabytes, :times => [3, 5]

with ps: illegal option -- o

The code says ps axo pid,ppid,pcpu,rss,etime,command.

This seems to work on smartos:

ps -eo pid,ppid,pcpu,rss,etime,comm