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Re: threading

From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.lang.python
Subject Re: threading
Date 2014-04-08 09:46 -0700
Organization Nightsong/Fort GNOX
Message-ID <7xzjjvbwge.fsf@ruckus.brouhaha.com> (permalink)
References <QLQ0v.62026$oI.9712@fx18.am4> <roy-B9EA87.09132408042014@news.panix.com> <mailman.9022.1396971675.18130.python-list@python.org>

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Sturla Molden <sturla.molden@gmail.com> writes:
> When should we use C++ or Fortran instead of Python? Ever?

When performance matters? 

> There is a reason scientists are running Python on even the biggest
> supercomputers today.

They use Python as a scripting wrapper around numerics libraries written
in compiled languages.

> Hardware might be expensive, but not compared to human resources.

Sure, and that implies that making people wait for computer results
costs you.  If a C++ program can run in 2 seconds while the equivalent
Python script would take a minute, the Python version loses the user's
attention and they have to burn time refocusing it.  Or if the C++
version takes 12 hours and the Python version takes a month, they can
start the C++ version at the end of their workday and have the results
when they arrive at the office the next morning.  Then they spend the
day examining the results and adjusting the program for the next run.

Most of my stuff is in Python but there are times when your stuff just
has to run fast.

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Thread

Re: threading Ben Finney <ben+python@benfinney.id.au> - 2014-04-07 13:05 +1000
  Re: threading Roy Smith <roy@panix.com> - 2014-04-06 23:48 -0400
    Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-07 13:56 +1000
      Re: threading Roy Smith <roy@panix.com> - 2014-04-07 08:26 -0400
        Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-07 22:34 +1000
          Re: threading Roy Smith <roy@panix.com> - 2014-04-07 09:22 -0400
            Re: threading Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-04-07 14:41 +0100
            Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-07 16:49 +0300
              Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-08 00:27 +1000
                Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-07 17:51 +0300
                Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-08 01:12 +1000
            Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-08 00:24 +1000
      Re: threading Rick Johnson <rantingrickjohnson@gmail.com> - 2014-04-08 18:09 -0700
        Re: threading "Neil D. Cerutti" <neilc@norwich.edu> - 2014-04-09 09:50 -0400
          Re: threading Rick Johnson <rantingrickjohnson@gmail.com> - 2014-04-09 08:51 -0700
            Re: threading MRAB <python@mrabarnett.plus.com> - 2014-04-09 18:47 +0100
              Re: threading Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-04-10 11:35 +1200
                Re: threading Roy Smith <roy@panix.com> - 2014-04-09 19:53 -0400
                Re: threading Andrew Berg <robotsondrugs@gmail.com> - 2014-04-09 19:02 -0500
                Re: threading Steven D'Aprano <steve@pearwood.info> - 2014-04-10 02:43 +0000
                Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 13:08 +1000
                Re: threading Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-04-10 09:23 +0100
                Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 19:11 +1000
            Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 04:00 +1000
            Re: threading Steven D'Aprano <steve@pearwood.info> - 2014-04-10 03:44 +0000
              Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 13:54 +1000
    Re: threading Ben Finney <ben+python@benfinney.id.au> - 2014-04-07 15:22 +1000
    Re: threading Ethan Furman <ethan@stoneleaf.us> - 2014-04-08 11:09 -0700
    Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-08 21:41 +0200
      Re: threading Grant Edwards <invalid@invalid.invalid> - 2014-04-08 20:30 +0000
        Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-09 00:32 +0200
          Re: threading Rustom Mody <rustompmody@gmail.com> - 2014-04-08 19:17 -0700
  Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-07 08:10 +0300
    Re: threading Paul Rubin <no.email@nospam.invalid> - 2014-04-06 22:39 -0700
      Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-07 08:46 +0300
      Re: threading Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-04-07 19:47 -0400
        Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-08 08:19 +0300
          Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-08 10:47 +0000
            Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-08 15:10 +0300
              Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-08 16:37 +0000
                Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-08 20:17 +0300
            Re: threading Roy Smith <roy@panix.com> - 2014-04-08 09:19 -0400
              Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-08 15:44 +0000
                Re: threading Paul Rubin <no.email@nospam.invalid> - 2014-04-08 09:38 -0700
                Re: threading Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-04-09 14:42 +0100
          Re: threading "Frank Millman" <frank@chagford.com> - 2014-04-09 15:23 +0200
            Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-09 16:55 +0300
              Re: threading "Frank Millman" <frank@chagford.com> - 2014-04-09 16:46 +0200
                Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-09 20:31 +0300
                Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 03:52 +1000
                Re: threading Mark H Harris <harrismh777@gmail.com> - 2014-04-10 08:29 -0500
                Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-09 19:20 +0000
          Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-09 23:47 +1000
            Re: threading Roy Smith <roy@panix.com> - 2014-04-09 10:44 -0400
          Re: threading "Frank Millman" <frank@chagford.com> - 2014-04-09 16:30 +0200
            Re: threading Roy Smith <roy@panix.com> - 2014-04-09 10:52 -0400
              Re: threading Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-04-10 11:19 +1200
            Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-09 19:48 +0300
          Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 00:44 +1000
          Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-09 15:29 +0000
          Re: threading Terry Reedy <tjreedy@udel.edu> - 2014-04-09 12:14 -0400
          Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 02:25 +1000
          Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-09 16:32 +0000
          Re: threading Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-04-09 19:44 -0400
          Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 11:05 +1000
          Re: threading "Frank Millman" <frank@chagford.com> - 2014-04-10 11:17 +0200
          Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 19:40 +1000
          Re: threading "Frank Millman" <frank@chagford.com> - 2014-04-10 13:10 +0200
            Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-10 14:43 +0300
              Re: threading Roy Smith <roy@panix.com> - 2014-04-10 08:56 -0400
              Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-10 15:24 +0000
                Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-10 19:20 +0300
              Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-11 01:32 +1000
                Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-10 19:25 +0300
                Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-11 03:08 +1000
                Re: threading Rustom Mody <rustompmody@gmail.com> - 2014-04-10 11:14 -0700
                Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-10 22:44 +0300
                Re: threading Rustom Mody <rustompmody@gmail.com> - 2014-04-10 13:21 -0700
                Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-10 23:44 +0300
                Re: threading Rustom Mody <rustompmody@gmail.com> - 2014-04-10 22:15 -0700
                Re: threading Rustom Mody <rustompmody@gmail.com> - 2014-04-10 23:50 -0700
                Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-11 18:36 +0300
                Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-12 01:53 +1000
                Re: threading Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-04-11 16:58 +0100
                Re: threading Rustom Mody <rustompmody@gmail.com> - 2014-04-11 11:54 -0700
                Re: threading Marko Rauhamaa <marko@pacujo.net> - 2014-04-11 22:27 +0300
                Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-11 01:51 +0200
                Re: threading Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-04-11 05:35 +0000
                Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-11 09:26 +0000
                Re: threading Roy Smith <roy@panix.com> - 2014-04-11 08:36 -0400
                Re: threading Grant Edwards <invalid@invalid.invalid> - 2014-04-11 16:18 +0000
                Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-11 02:21 +0200
                Re: threading Terry Reedy <tjreedy@udel.edu> - 2014-04-10 20:23 -0400
          Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-10 21:19 +1000
      Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-08 02:06 +0000
        Re: threading alister <alister.nospam.ware@ntlworld.com> - 2014-04-08 11:07 +0000
          Re: threading Roy Smith <roy@panix.com> - 2014-04-08 09:13 -0400
            Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-08 23:23 +1000
              Re: threading alister <alister.nospam.ware@ntlworld.com> - 2014-04-08 14:15 +0000
                Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-08 16:06 +0000
            Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-08 15:40 +0000
              Re: threading Paul Rubin <no.email@nospam.invalid> - 2014-04-08 09:46 -0700
                Re: threading Chris Angelico <rosuav@gmail.com> - 2014-04-09 02:46 +1000
                Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-08 17:17 +0000
          Re: threading Sturla Molden <sturla.molden@gmail.com> - 2014-04-08 15:19 +0000

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