Re: [PATCH] emacs: wash: make word-wrap bound message width

[notmuch-archives.git] / 73 / 8a045d1b8ece9c7326878d5e3cf393a6fcc204

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From: Tomi Ollila <tomi.ollila@iki.fi>\r
To: Dmitry Kurochkin <dmitry.kurochkin@gmail.com>, notmuch@notmuchmail.org\r
Subject: Re: [PATCH 1/3] test: add functions to count how much times notmuch\r
        was called\r
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Date: Wed, 30 Nov 2011 13:53:24 +0200\r
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On Wed, 30 Nov 2011 01:03:27 +0400, Dmitry Kurochkin <dmitry.kurochkin@gmail.com> wrote:\r
> Hi Tomi.\r
> \r
> On Tue, 29 Nov 2011 14:58:00 +0200, Tomi Ollila <tomi.ollila@iki.fi> wrote:\r
> > Hi Dmitry.\r
\r
[ ... ]\r
\r
> > \r
> > The (posix) shell command language defines 'Arithmetic Expansion' in\r
> > \r
> > http://pubs.opengroup.org/onlinepubs/007908799/xcu/chap2.html#tag_001_006_004\r
> > \r
> > I.e. using format $(( expression )) makes shell doing the arithetic itself\r
> > instead of forking a process (or two!) to do so.\r
> > \r
> \r
> I though expr was a builtin.  Now I agree that it is better to replace\r
> it with $(()), even though I still prefer the expr syntax.\r
\r
Actually, I thought also that expr was a builtin. That makes the resolution\r
'forks subshell to execute builtin expr' below wrong. If it were a builtin\r
then bash would also fork only once (to get details right). I re-tested\r
with zsh using 'builtin pwd' and '/bin/pwd' instead of 'expr' -- only one fork \r
in each case. So, those who examined my tests with deep interest also note\r
this correction.\r
\r
\r
> > Normally in this case it is not so big deal (and still it isn't, but...)\r
> > In this  particular case the shell wrapper counting notmuch launches and\r
> > exec'ing it the wrapper could do this without fork(2)ing a single time\r
> > (i.e. keep the process count unchanged compared to execing notmuch\r
> > directly)\r
> > \r
> > Anyway, many opinions; as far as it works I'm fine with it :) \r
> > \r
> > Now that you feel relaxed, check the results of some further\r
> > experimentation ;) :\r
> > \r
> > excerpt from man strace:\r
> > \r
> >        -ff         If the -o filename option is in effect,  each  processes\r
> >                    trace  is  written  to  filename.pid  where  pid  is the\r
> >                    numeric process id of each process.\r
> > \r
> > Executing  rm -f forked.*; strace -ff -o forked bash -c 'echo $(( 5 + 5 ))' \r
> > \r
> > will output '10' and create just one 'forked.<pid>' file\r
> > \r
> > Executing  rm -f forked.*; strace -ff -o forked bash -c 'echo $(expr 5 + 5)' \r
> > \r
> > output 10 as expected, but there is now *3* forked.<pid> files !\r
> > \r
> > bash does not optmize; it forks subshell to execute $(...) and then\r
> > there just works as usual (forks subshell to execute builtin expr))\r
> > \r
> > Executing  rm -f forked.*; strace -ff -o forked bash -c 'echo $(exec expr 5 + 5)' \r
> > \r
> > (the added 'exec' takes off one fork -- just 2 forked.<pid> files appear).\r
> > \r
> > I did the same tests using dash, ksh & zsh on linux system, and every one\r
> > of these managed to optimize one fork out in the above 3 fork case.\r
> > \r
> \r
> Thanks for details.\r
> \r
> Regards,\r
>   Dmitry\r
> \r
> > \r
> > Tomi\r
\r
Tomi\r