On Thursday, August 11, 2016 at 2:19:38 AM UTC+3, Tony Mechelynck wrote:
> There are other factors which are right there in the help:
> - job_start() returns a Job object and doesn't wait for the job to finish
> - system() waits for the external command to finish and returns its
> full stdout output as a string.
>
> I don't know Vim job control really well, but I seem to understand
> that in order to compare system() timing and job control timing you
> would have to set up callbacks to gather any output from the channel,
> and a callback to be called when the job ends (it may still write to
> stdout after it exits), and measure the time from just before
> job_start() to just after making sure that all output has been
> collected and that the job has ended.
>
> You might even, for testing purposes, try to write a System() user
> function to invoke the argument as a job and return its output as a
> string, with the disadvantage that you would completely lose job
> control asynchronism. But it would allow you a better comparison,
> namely between old-fashioned system() and this new job-control-based
> System().
>
> Best regards,
> Tony.
That's exactly what I've did:
func! Job()
let s:rt = reltime()
let g:output = []
let g:job = job_start(['/bin/sh', '-c', 'cat ' . expand('%')], {'out_cb':
function('s:out_cb'), 'close_cb': function('s:close_cb')})
endfunc
func! s:out_cb(channel, msg)
call add(g:output, a:msg)
endfunc
func! s:close_cb(channel)
echo reltimestr(reltime(s:rt))
"echo g:output
endfunc
" compare with:
func! System()
let s:rt = reltime()
let g:output = systemlist('cat ' . expand('%'))
echo reltimestr(reltime(s:rt))
endfunc
"""""""""""""
I checked it now on my Ubuntu at home - I still see the difference but now both
are much faster so even the system() delay is not noticeable. Any idea what
could cause the delay on my RHEL?
BTW, if I remove the comment from the 'echo g:output' line in close_cb() the
message is not displayed (actually, it depends on which command is running. for
the 'cat' command above -there is no message).
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