Re: creating size-limited tar files

References	(11 earlier) <CALwzidkfARHC5Twpw01xQrOWe4msWdLSH2B=5i4oMwadPyQniA@mail.gmail.com> <87fw4clg8b.fsf@nitrogen.i-did-not-set--mail-host-address--so-tickle-me> <CAF_E5JYYEQ77rEQb1tM5tDKbTTSwYNVv1An57bUKn8Y_d-VJUQ@mail.gmail.com> <CAF_E5Jbk2inQbTrurgBKP2DLjzR9=t4XXSGbafuq-E3UvJjaiw@mail.gmail.com> <50A3C287.80707@davea.name>
Date	2012-11-14 16:16 +0000
Subject	Re: creating size-limited tar files
From	andrea crotti <andrea.crotti.0@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.3692.1352909779.27098.python-list@python.org> (permalink)

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2012/11/14 Dave Angel <d@davea.name>:
> On 11/14/2012 10:56 AM, andrea crotti wrote:
>> Ok this is all very nice, but:
>>
>> [andrea@andreacrotti tar_baller]$ time python2 test_pipe.py > /dev/null
>>
>> real  0m21.215s
>> user  0m0.750s
>> sys   0m1.703s
>>
>> [andrea@andreacrotti tar_baller]$ time ls -lR /home/andrea | cat > /dev/null
>>
>> real  0m0.986s
>> user  0m0.413s
>> sys   0m0.600s
>>
>> <snip>
>>
>>
>> So apparently it's way slower than using this system, is this normal?
>
> I'm not sure how this timing relates to the thread, but what it mainly
> shows is that starting up the Python interpreter takes quite a while,
> compared to not starting it up.
>
>
> --
>
> DaveA
>

Well it's related because my program has to be as fast as possible, so
in theory I thought that using Python pipes would be better because I
can get easily the PID of the first process.

But if it's so slow than it's not worth, and I don't think is the
Python interpreter because it's more or less constantly many times
slower even changing the size of the input..

Thread

creating size-limited tar files andrea crotti <andrea.crotti.0@gmail.com> - 2012-11-07 17:13 +0000
  Re: creating size-limited tar files Neil Cerutti <neilc@norwich.edu> - 2012-11-07 18:40 +0000
  Re: creating size-limited tar files Alexander Blinne <news@blinne.net> - 2012-11-07 20:05 +0100
    Re: creating size-limited tar files Roy Smith <roy@panix.com> - 2012-11-07 15:32 -0500
      Re: creating size-limited tar files Andrea Crotti <andrea.crotti.0@gmail.com> - 2012-11-07 21:52 +0000
      Re: creating size-limited tar files Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2012-11-07 23:15 +0000
      Re: creating size-limited tar files andrea crotti <andrea.crotti.0@gmail.com> - 2012-11-08 10:11 +0000
      Re: creating size-limited tar files andrea crotti <andrea.crotti.0@gmail.com> - 2012-11-08 10:29 +0000
      Re: creating size-limited tar files andrea crotti <andrea.crotti.0@gmail.com> - 2012-11-09 10:39 +0000
      Re: creating size-limited tar files andrea crotti <andrea.crotti.0@gmail.com> - 2012-11-13 10:31 +0000
      Re: creating size-limited tar files Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-13 09:07 -0700
      Re: creating size-limited tar files Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-13 09:25 -0700
      Re: creating size-limited tar files Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-13 09:30 -0700
      Re: creating size-limited tar files Kushal Kumaran <kushal.kumaran+python@gmail.com> - 2012-11-14 11:35 +0530
      Re: creating size-limited tar files Ian Kelly <ian.g.kelly@gmail.com> - 2012-11-14 00:22 -0700
      Re: creating size-limited tar files Kushal Kumaran <kushal.kumaran+python@gmail.com> - 2012-11-14 14:21 +0530
      Re: creating size-limited tar files andrea crotti <andrea.crotti.0@gmail.com> - 2012-11-14 11:52 +0000
      Re: creating size-limited tar files andrea crotti <andrea.crotti.0@gmail.com> - 2012-11-14 15:56 +0000
      Re: creating size-limited tar files Dave Angel <d@davea.name> - 2012-11-14 11:10 -0500
      Re: creating size-limited tar files andrea crotti <andrea.crotti.0@gmail.com> - 2012-11-14 16:16 +0000
  Re: creating size-limited tar files Dave Angel <d@davea.name> - 2012-11-14 11:33 -0500
  Re: creating size-limited tar files Andrea Crotti <andrea.crotti.0@gmail.com> - 2012-11-14 20:43 +0000
  Re: creating size-limited tar files Dave Angel <d@davea.name> - 2012-11-14 15:57 -0500

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