Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #96343

Re: Signal SIGINT ignored during socket.accept

Path csiph.com!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail
From Marko Rauhamaa <marko@pacujo.net>
Newsgroups comp.lang.python
Subject Re: Signal SIGINT ignored during socket.accept
Date Fri, 11 Sep 2015 17:00:30 +0300
Organization A noiseless patient Spider
Lines 29
Message-ID <87k2rxqcn5.fsf@elektro.pacujo.net> (permalink)
References <msshpm$7pn$1@dont-email.me> <mailman.332.1441910212.8327.python-list@python.org> <msskh1$j00$1@dont-email.me> <mailman.337.1441913195.8327.python-list@python.org> <msso49$28e$1@dont-email.me> <mailman.348.1441936893.8327.python-list@python.org> <msum6c$hv$1@reader1.panix.com>
Mime-Version 1.0
Content-Type text/plain
Injection-Info mx02.eternal-september.org; posting-host="b7cb1518d23ec19d482dcc9c31d30fdd"; logging-data="6297"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/TQb6xBeKh8sQ9cFZSxgeH"
User-Agent Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)
Cancel-Lock sha1:MpeQI17DlzGa8vlHSldWIC/nVOY= sha1:5K1MmxW2jBZ6HuLfeFL7ibHkuj4=
Xref csiph.com comp.lang.python:96343

Show key headers only | View raw

Grant Edwards <invalid@invalid.invalid>:

> On 2015-09-11, Chris Angelico <rosuav@gmail.com> wrote:
>> This is what I meant when I said you would be polling. Effectively,
>> you wake up your program every half-second, check if Ctrl-C has been
>> pressed, and if it hasn't, you go back to sleep again. This is pretty
>> inefficient.
>
> Though it offends one's engineering sensibilities[1], it's just not
> that inefficient. I'd bet money you won't even be able to measure the
> difference in CPU usage. Waking up twice per second and immediately
> calling select() again on any hardware/OS built in the past 50 years
> is going completely negligible (as long as you can ignore the smell).
>
> Even waking up ten times per second won't be noticeable.
>
> Waking up every millisecond or two might be noticeable.

It can add up. In particular, it can prevent the CPU from staying in the
low-power mode, especially on battery-powered devices.

  <URL: https://lwn.net/Articles/549580/>

Another environment where such polling circuses can actually overwhelm a
CPU is virtual machines. When dozens or hundreds of VMs are each polling
left and right, the host may not get much actual work done.


Marko

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Signal SIGINT ignored during socket.accept "James Harris" <james.harris.1@gmail.com> - 2015-09-10 19:24 +0100
  Re: Signal SIGINT ignored during socket.accept Chris Angelico <rosuav@gmail.com> - 2015-09-11 04:36 +1000
    Re: Signal SIGINT ignored during socket.accept "James Harris" <james.harris.1@gmail.com> - 2015-09-10 20:11 +0100
      Re: Signal SIGINT ignored during socket.accept Chris Angelico <rosuav@gmail.com> - 2015-09-11 05:26 +1000
        Re: Signal SIGINT ignored during socket.accept "James Harris" <james.harris.1@gmail.com> - 2015-09-10 21:12 +0100
          Re: Signal SIGINT ignored during socket.accept Chris Angelico <rosuav@gmail.com> - 2015-09-11 12:01 +1000
            Re: Signal SIGINT ignored during socket.accept Grant Edwards <invalid@invalid.invalid> - 2015-09-11 13:50 +0000
              Re: Signal SIGINT ignored during socket.accept Marko Rauhamaa <marko@pacujo.net> - 2015-09-11 17:00 +0300
              Re: Signal SIGINT ignored during socket.accept Chris Angelico <rosuav@gmail.com> - 2015-09-12 00:27 +1000
              Re: Signal SIGINT ignored during socket.accept "James Harris" <james.harris.1@gmail.com> - 2015-09-11 18:14 +0100
                Re: Signal SIGINT ignored during socket.accept "James Harris" <james.harris.1@gmail.com> - 2015-09-12 00:15 +0100

csiph-web