Ramel Eshed <rame...@gmail.com> wrote:
> My problem is not with the channel, the problem is
> that system() is slower than the equivalent job_start().
> You can run and compare the results of Job() and System()
> functions in the attached file. They are both doing the same
> thing ('echo aaa') but System() is ~5 times slower than Job()
> on Ubuntu and x10 slower on RHEL5.5. On RHEL
> System() is extremely slow, it takes about 0.2 seconds
> which cause Vim to hang.
I just tried the script system.vim which you attached
and measured x3 times on my laptop x86_64
(xubuntu-14.04) using Vim-7.4.2290:
:so system.vim
:call Job()
aaa: 0.004798
:call Job()
aaa: 0.002810
call Job()
aaa: 0.002988
:call System()
aaa: 0.007809
:call System()
aaa: 0.007768
:call System()
aaa: 0.007858
So for me, System() is also slower than Job().
However, the difference on my machine is not
as large as yours. I don't see system()
taking 0.2 sec as you see on RHEL.
I tried this with strace:
$ strace -r -f -osystem.trace time ./vim -u NONE -N -S system.vim -c
'call System()|q'
$ strace -r -f -ojob.trace time ./vim -u NONE -N -S system.vim -c
'call Job()|q'
Looking at log files jobs.trace and system.trace,
I saw that:
In system.trace
8756 execve("/bin/bash", ["/bin/bash", "-c", "(echo aaa)
>/tmp/vwA2O35/0 2>&1"], [/* 69 vars */] <unfinished ...>
In job.trace:
8773 execve("/bin/sh", ["/bin/sh", "-c", "echo aaa"], [/* 72 vars */]
<unfinished ...>
Ah, it's not using the same shell! /bin/sh is a symlink
to /bin/dash on my system, which is a simpler shell
than /bin/bash. system() also runs the command in a
subshell which may make it slower.
I then added this line in your script system.vim:
set shell=/bin/sh
And now system() is faster, still not as fast as Job() but
getting closer:
:call System()
aaa: 0.004737
:call System()
aaa: 0.004920
:call System()
aaa: 0.004718
What is the value of :echo &shell for you?
Can you try with set shell=/bin/sh ?
Here is my modified system.vim:
===
$ cat system.vim
set shell=/bin/sh
func! Job()
let g:output = []
let s:rt = reltime()
let g:job = job_start(['/bin/sh', '-c', 'echo aaa'], {'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 g:output[0] . ': ' . reltimestr(reltime(s:rt))
endfunc
" compare with:
func! System()
let s:rt = reltime()
let g:output = systemlist('echo aaa')
echo g:output[0] . ': ' . reltimestr(reltime(s:rt))
endfunc
===
Regards
Dominique
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