UsrMove feature (was Re: FESCo meeting minutes for 2011-10-24)

MichaƂ Piotrowski mkkp4x4 at gmail.com
Tue Oct 25 18:46:25 UTC 2011


2011/10/25 Richard W.M. Jones <rjones at redhat.com>:
> On Tue, Oct 25, 2011 at 08:39:25PM +0200, Michał Piotrowski wrote:
>> 2011/10/25 Richard W.M. Jones <rjones at redhat.com>:
>> > On Tue, Oct 25, 2011 at 08:33:28PM +0200, Michał Piotrowski wrote:
>> >> 2011/10/25 Chris Adams <cmadams at hiwaay.net>:
>> >> > Once upon a time, Michał Piotrowski <mkkp4x4 at gmail.com> said:
>> >> >> I created feature page
>> >> >> https://fedoraproject.org/wiki/Features/F18MorePortableInterpreters
>> >> >
>> >> > I strongly object to this "feature".  /bin/sh is a Unix standard back to
>> >> > IIRC around 7th Edition, and there is NO good reason to break it.  The
>> >> > "#!/usr/bin/env foo" suggested replacement has always been a hack to
>> >> > work around broken systems, not something suggested for all scripts.
>> >>
>> >> What is wrong with
>> >> #!/usr/bin/env interpreter
>> >> from technical POV?
>> >
>> > This is what's wrong:
>> >
>> >  $ cat > sh.sh
>> >  #!/bin/sh
>> >  $ cat > env.sh
>> >  #!/usr/bin/env sh
>> >  $ chmod +x sh.sh env.sh
>> >  $ time for i in $(seq 1000); do ./sh.sh; done
>> >
>> >  real            0m2.737s
>> >  user            0m0.750s
>> >  sys             0m1.519s
>> >  $ time for i in $(seq 1000); do ./env.sh; done
>> >
>> >  real            0m3.677s
>> >  user            0m1.013s
>> >  sys             0m2.296s
>> >
>>
>> Yeah, it is noticeably slower - about 0,00094s.
>
> 34% slower is a more appropriate way to look at it.

34% slower or 0,00094s slower - it depends on the POV :)

>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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-- 
Best regards,
Michal

http://eventhorizon.pl/


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