Hi there,
I hope this e-mail is still on time for you. I have implemented this
architecture a few times, and they all work fine nowadays. However, your
question made me review it and create a small gist.
I suggest you create a thread for every output and input connection. This
makes it easier to
On 11/1/2015 9:05 AM, Vindhyachal Takniki wrote:
I have made a python code & using multithreading in it. this is very basic code,
not using queues & other stuff.
You can run multiple windows, or one window with multiple panes, in one
thread with one event loop. Best to do gui stuff in the ma
On Mon, Nov 2, 2015 at 1:05 AM, Vindhyachal Takniki
wrote:
> #get reading at every 1 second
> def get_analog_1(thread_name):
> global read_ok_1, current_time_1,analog_1
> while True:
> if((time.time() - current_time_1) > 1):
> if(0 == read_ok_1):
> curre
In a message of Sun, 01 Nov 2015 06:05:58 -0800, Vindhyachal Takniki writes:
>I have made a python code & using multithreading in it. this is very basic
>code, not using queues & other stuff.
This is your problem.
The code that uses queues is more basic.
For tkinter you cannot use threads like yo
On 8/13/2013 4:06 AM, samaneh.yahyap...@gmail.com wrote:
Aside from the other comments...
def item_thread(self):
imageAnalyzer=ctypes.CDLL("../so/image_process.so")
imageAnalyzer.aref_img_score_init("/opt/amniran/etc/face.xml",
"/opt/amniran/etc/porn.xml")
for f
samaneh.yahyap...@gmail.com wrote:
> hi
> my program work by 4 thread but when i use more thread it terminates
>
> how can i solve this problem
I simplified the code so I could actually run it, and tested it in
Python 2.7, both under Komodo IDE and in the terminal.
The code:
#!/usr/bin/en
samaneh.yahyap...@gmail.com wrote:
> hi
> my program work by 4 thread but when i use more thread it terminates
>
>
I simplified your code so anybody could run it, and tested it inside
Komodo IDE, on Python 2.7
#!/usr/bin/env python
import sys
import os
import time
import threading
class MyC
On Tue, 13 Aug 2013 01:06:01 -0700, samaneh.yahyapour wrote:
> hi
> my program work by 4 thread but when i use more thread it terminates
Is that a problem? Isn't it supposed to terminate, when it has finished?
If it raises an exception, or crashes, you should tell us.
> i use opencv in my ima
Kiuhnm wrote:
> I have a decorator which takes an optional argument that tells me
> whether I should use locks.
> Maybe I could import 'threading' only if needed. If the user wants to
> use locks I'll assume that 'threading' is available on his/her system.
Use of dummy_threading might be cleaner.
On 4/8/2012 7:04, Bryan wrote:
Kiuhnm wrote:
My question is this: can I use 'threading' without interfering with the
program which will import my module?
Yes. The things to avoid are described at the bottom of:
http://docs.python.org/library/threading.html
On platforms without threads, 'impor
Kiuhnm wrote:
> My question is this: can I use 'threading' without interfering with the
> program which will import my module?
Yes. The things to avoid are described at the bottom of:
http://docs.python.org/library/threading.html
On platforms without threads, 'import threading' will fail. There's
On Apr 7, 5:06 pm, Kiuhnm wrote:
> On 4/7/2012 22:09, Bryan wrote:>> For instance, let's say I want to make this
> code thread-safe:
>
> >> --->
> >> myDict = {}
>
> >> def f(name, val):
> >> if name not in myDict:
> >> myDict[name] = val
> >> return myDict[name]
> >> <---
>
On 4/7/2012 22:09, Bryan wrote:
For instance, let's say I want to make this code thread-safe:
--->
myDict = {}
def f(name, val):
if name not in myDict:
myDict[name] = val
return myDict[name]
<---
First, don't re-code Python's built-ins. The example is a job for
dict.setd
Kiuhnm wrote:
> I'm about to write my first module and I don't know how I should handle
> multithreading/-processing.
> I'm not doing multi-threading inside my module. I'm just trying to make
> it thread-safe so that users *can* do multi-threading.
There are a couple conventions to follow. Trying
On Dec 26, 2011 4:13 PM, "Yigit Turgut" wrote:
> Why is there N variable in write_data function ? N is related to
> timer.tick(N) which is related to display function ? time.sleep(N)
> will pause writing to file for specified amount of time which is
> exactly what I am trying to avoid.
My underst
On Dec 26, 10:01 pm, Ian Kelly wrote:
> On Mon, Dec 26, 2011 at 11:31 AM, Yigit Turgut wrote:
> > I have a loop as following ;
>
> > start = time.time()
> > end = time.time() - start
> > while(end > data1 = self.chan1.getWaveform()
> > end = time.time() - start
> > tim
On Mon, Dec 26, 2011 at 1:13 PM, Yigit Turgut wrote:
> I had thought the same workaround but unfortunately loop is already
> under a def ;
So nest the functions, or refactor it. Either way, that shouldn't be
a significant obstacle.
--
http://mail.python.org/mailman/listinfo/python-list
On Dec 26, 10:03 pm, Ian Kelly wrote:
> On Mon, Dec 26, 2011 at 1:01 PM, Ian Kelly wrote:
> > You essentially have two completely independent loops that need to run
> > simultaneously with different timings. Sounds like a good case for
> > multiple threads (or processes if you prefer, but these
On Mon, Dec 26, 2011 at 1:01 PM, Ian Kelly wrote:
> You essentially have two completely independent loops that need to run
> simultaneously with different timings. Sounds like a good case for
> multiple threads (or processes if you prefer, but these aren:
I accidentally sent before I was finishe
On Mon, Dec 26, 2011 at 11:31 AM, Yigit Turgut wrote:
> I have a loop as following ;
>
> start = time.time()
> end = time.time() - start
> while(end data1 = self.chan1.getWaveform()
> end = time.time() - start
> timer.tick(10) #FPS
> screen.fill((255,255,255)
On 30 Aralık 2009, 17:44, mk wrote:
> Hello everyone,
>
> I have figured out (sort of) how to do profiling of multithreaded
> programs with cProfile, it goes something like this:
>
> #!/usr/local/bin/python
>
> import cProfile
> import threading
>
> class TestProf(threading.Thread):
> def __i
> 39123 function calls (38988 primitive calls) in 6.004 CPU
> seconds
>
[...]
>
> It's not burning CPU time in the main thread (profiling with cProfile
> indicated smth similar to the above), it's not burning it in the
> individual worker threads
What do you mean, it's not b
See the standard help on the threading and thread module.
Almar
2009/5/12 shruti surve :
> hi,
> how to do multithreading in python??? Like running dialog box and running
> xml rpc calls simultaneously???
>
>
> regards
> shruti
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
--
On Apr 12, 2:59 am, a...@pythoncraft.com (Aahz) wrote:
> In article
> <57065c62-2024-47b5-a07e-1d60ff85b...@y10g2000prc.googlegroups.com>,
>
> tleeuwenb...@gmail.com wrote:
>
> >Is there anyway to begin a thread and execute a finite number of lines
> >of code, or a finite amount of time within it
On Apr 11, 10:39 pm, "Diez B. Roggisch" wrote:
> tleeuwenb...@gmail.com schrieb:
>
> > Is there anyway to begin a thread and execute a finite number of lines
> > of code, or a finite amount of time within it?
>
> > For example, say I create three child threads and I want to guarantee
> > equal tim
In article <57065c62-2024-47b5-a07e-1d60ff85b...@y10g2000prc.googlegroups.com>,
tleeuwenb...@gmail.com wrote:
>
>Is there anyway to begin a thread and execute a finite number of lines
>of code, or a finite amount of time within it?
>
>For example, say I create three child threads and I want to gua
tleeuwenb...@gmail.com schrieb:
Is there anyway to begin a thread and execute a finite number of lines
of code, or a finite amount of time within it?
For example, say I create three child threads and I want to guarantee
equal timeshare between them, can I specify a quanta (say 400 LOC
although I
Laszlo Nagy wrote:
Abhishek Asthana wrote:
Hi all ,
I have large set of data computation and I want to break it into
small batches and assign it to different threads .I am implementing it
in python only. Kindly help what all libraries should I refer to
implement the multithreading in pytho
On Jul 3, 12:40 pm, Laszlo Nagy <[EMAIL PROTECTED]> wrote:
> Abhishek Asthana wrote:
>
> > Hi all ,
>
> > I have large set of data computation and I want to break it into
> > small batches and assign it to different threads .I am implementing it
> > in python only. Kindly help what all libraries s
Abhishek Asthana wrote:
Hi all ,
I have large set of data computation and I want to break it into
small batches and assign it to different threads .I am implementing it
in python only. Kindly help what all libraries should I refer to
implement the multithreading in python.
You should not
"Paul Boddie" <[EMAIL PROTECTED]> writes:
> What makes all of the following not "Pythonic"...?
> http://wiki.python.org/moin/ParallelProcessing
I'd say mainly that they don't allow sharing data between processes
except through expensive IPC mechanisms involving system calls.
> I'm sure one could
On 8 Mar, 10:48, Bryan Olson <[EMAIL PROTECTED]> wrote:
>
> That doesn't really work in Python. There have been projects to
> allow Pythonic coordination of processes -- POSH had some good
> ideas -- but none have reached fruition.
What makes all of the following not "Pythonic"...?
http://wiki.py
sturlamolden wrote:
[...]
> If you want to utilize the computing power of multiple CPUs, you
> should use multiple processes instead of threads. On Python this is
> mandatory due to the GIL. In any other language it it highly
> recommended. The de-factor standard for parallel multiprocessing (MPI)
Carl J. Van Arsdall wrote:
> Not necessarily, if he's on a full duplex ethernet connection,
> then there is some parallelity he can take advantage of. He has
> upstream and downstream.
Partly agreed. There is one bus to the network device, and CPU
should be very much faster than the network devi
On Feb 9, 4:00 pm, "S.Mohideen" <[EMAIL PROTECTED]>
wrote:
> I am sorry if I sound foolish.
> Suppose I split my Net application code using parallel python into several
> processes based upon the number of CPU available. That means a single socket
> descriptor is distributed across all processes.
"S.Mohideen" <[EMAIL PROTECTED]> writes:
> Suppose I split my Net application code using parallel python into
> several processes based upon the number of CPU available. That means a
> single socket descriptor is distributed across all processes. Is
> parallelity can be acheived using the processes
the single socket multiplexed
across all the processes.. I haven't tried it yet - would like to have any
past experience related to this.
- Original Message -
From: "Carl J. Van Arsdall" <[EMAIL PROTECTED]>
To:
Sent: Thursday, February 08, 2007 3:44 PM
Subjec
Bjoern Schliessmann wrote:
> [snip]
> What makes you think that'll be faster?
>
> Remember:
> - If you have one CPU, there is no parallelity at all.
> - If you do have multiple CPUs but only one network device, there is
> no parallel networking.
>
>
Not necessarily, if he's on a full duplex ethe
S.Mohideen wrote:
> There is a dictionary on which I store/read data values. I want to
> seperate the send and recv functionality on two different
> processes so that the parallel execution becomes fast.
What makes you think that'll be faster?
Remember:
- If you have one CPU, there is no paralle
S.Mohideen wrote:
> I would like to add my problem in this thread.
> I have a network application in Python which sends and recv using a single
> socket.
> There is a dictionary on which I store/read data values. I want to seperate
> the send and recv functionality on two different processes so t
Sergei Organov" <[EMAIL PROTECTED]>
To:
Sent: Wednesday, February 07, 2007 1:03 PM
Subject: Re: multithreading concept
> "sturlamolden" <[EMAIL PROTECTED]> writes:
>> On Feb 7, 6:17 pm, John Nagle <[EMAIL PROTECTED]> wrote:
> [...]
>> MPI
Paul Boddie wrote:
> [snip]
>
> Take a look at the Python Wiki for information on parallel processing
> with Python:
>
> http://wiki.python.org/moin/ParallelProcessing
>
What a great resource! That one is book marked for sure. I was
wondering if anyone here had any opinions on some of the tec
On Feb 7, 8:03 pm, Sergei Organov <[EMAIL PROTECTED]> wrote:
> I fail to see how threads in general could perform worse than
> processes. I do understand that processes are inherently more
> safe/secure, but when it comes to speed I really can't imagine why it
> could happen that threads perform w
"sturlamolden" <[EMAIL PROTECTED]> writes:
> On Feb 7, 6:17 pm, John Nagle <[EMAIL PROTECTED]> wrote:
[...]
> MPI does not use threads on SMPs because it performs worse than using
> multiple processes.
I fail to see how threads in general could perform worse than
processes. I do understand that pr
On Feb 7, 6:17 pm, John Nagle <[EMAIL PROTECTED]> wrote:
> Multithread compute-bound programs on multiple CPUs are
> how you get heavy number-crunching work done on multiprocessors.
In the scientific community, heavy CPU-bound tasks are either
parallelized using MPI and/or written in Fortran
John Nagle wrote:
> sturlamolden wrote:
>> On Feb 7, 2:53 am, "S.Mohideen" <[EMAIL PROTECTED]>
>> wrote:
>> This has been discussed to death before. Win32 threads and pthreads
>> (which is what Python normally uses, depending on the platform) are
>> designed to stay idle most of the time. They are
sturlamolden wrote:
> On Feb 7, 2:53 am, "S.Mohideen" <[EMAIL PROTECTED]>
> wrote:
> This has been discussed to death before. Win32 threads and pthreads
> (which is what Python normally uses, depending on the platform) are
> designed to stay idle most of the time. They are therefore not a tool
> fo
On 7 Feb, 02:53, "S.Mohideen" <[EMAIL PROTECTED]>
wrote:
>
> Python is praised about - me too. But at one instance it fails. It fails to
> behave as a true multi-threaded application. That means utilizing all the
> CPUs parallely in the SMP efficiently stays as a dream for a Python
> Programmer.
T
On Feb 7, 2:53 am, "S.Mohideen" <[EMAIL PROTECTED]>
wrote:
> Python is praised about - me too. But at one instance it fails. It fails to
> behave as a true multi-threaded application. That means utilizing all the
> CPUs parallely in the SMP efficiently stays as a dream for a Python
> Programmer.
On Feb 7, 1:53 am, "S.Mohideen" <[EMAIL PROTECTED]>
wrote:
> Hi Folks,
>
> Python is praised about - me too. But at one instance it fails. It fails to
> behave as a true multi-threaded application. That means utilizing all the
> CPUs parallely in the SMP efficiently stays as a dream for a Python
>
freesteel wrote:
...
> pThread[ih] = AfxBeginThread(MyThread, mainThreadState,
> THREAD_PRIORITY_NORMAL, CREATE_SUSPENDED);
...
Here the call to AfxBeginThread is wrong, there is one argument
missing, it should be:
pThread[ih] = AfxBeginThread(MyThread, mainThreadState,
TH
In article <[EMAIL PROTECTED]>,
Istvan Albert <[EMAIL PROTECTED]> wrote:
>Marc 'BlackJack' Rintsch wrote:
>>
>> It's not in Jython nor IronPython and maybe not forever in
>> CPython.
>
>Whether or not a feature is present in Jython or IronPython does not
>seem relevant, after all these languages em
K.S.Sreeram <[EMAIL PROTECTED]> wrote:
...
> Alex Martelli wrote:
> > Well then, feel free to code under such assumptions (as long as you're
> > not working on any project in which I have any say:-)
>
> Hey, I would *never* write code which depends on such intricate
> implementation details! No
Alex Martelli wrote:
> Well then, feel free to code under such assumptions (as long as you're
> not working on any project in which I have any say:-)
Hey, I would *never* write code which depends on such intricate
implementation details! Nonetheless, its good to *know* whats going on
inside. As th
Istvan Albert <[EMAIL PROTECTED]> wrote:
> Marc 'BlackJack' Rintsch wrote:
>
> > It's not in Jython nor IronPython and maybe not forever in
> > CPython.
>
> Whether or not a feature is present in Jython or IronPython does not
> seem relevant, after all these languages emulate Python, one could
K.S.Sreeram <[EMAIL PROTECTED]> wrote:
...
> Consider two threads A and B, which are independent except for the fact
> that they reside in the same module.
>
> def thread_A() :
> global foo
> foo = 1
>
> def thread_B() :
> global bar
> bar = 2
>
> These threads create entries
Marc 'BlackJack' Rintsch wrote:
> It's not in Jython nor IronPython and maybe not forever in
> CPython.
Whether or not a feature is present in Jython or IronPython does not
seem relevant, after all these languages emulate Python, one could
argue that it only means that this emulation is incomplet
Alex Martelli wrote:
> Wrong, alas: each assignment *could* cause the dictionary's internal
> structures to be reorganized (rehashed) and impact another assignment
> (or even 'get'-access).
(been thinking about this further...)
Dictionary get/set operations *must* be atomic, because Python makes
Marc 'BlackJack' Rintsch wrote:
>>> Wrong, alas: each assignment *could* cause the dictionary's internal
>>> structures to be reorganized (rehashed) and impact another assignment
>>> (or even 'get'-access).
>> but wont the GIL be locked when the rehash occurs?
>
> If there is a GIL then maybe yes.
In <[EMAIL PROTECTED]>, K.S.Sreeram
wrote:
> Alex Martelli wrote:
>> Wrong, alas: each assignment *could* cause the dictionary's internal
>> structures to be reorganized (rehashed) and impact another assignment
>> (or even 'get'-access).
>
> but wont the GIL be locked when the rehash occurs?
If
Alex Martelli wrote:
> Wrong, alas: each assignment *could* cause the dictionary's internal
> structures to be reorganized (rehashed) and impact another assignment
> (or even 'get'-access).
but wont the GIL be locked when the rehash occurs?
Regards
Sreeram
signature.asc
Description: OpenPGP di
Alex Martelli wrote:
> Istvan Albert <[EMAIL PROTECTED]> wrote:
>
> > Stéphane Ninin wrote:
> >
> > > Is a lock required in such a case ?
> >
> > I believe that assignment is atomic and would not need a lock.
>
> Wrong, alas: each assignment *could* cause the dictionary's internal
> structures to
Istvan Albert <[EMAIL PROTECTED]> wrote:
> Stéphane Ninin wrote:
>
> > Is a lock required in such a case ?
>
> I believe that assignment is atomic and would not need a lock.
Wrong, alas: each assignment *could* cause the dictionary's internal
structures to be reorganized (rehashed) and impact a
Stéphane Ninin wrote:
> Is a lock required in such a case ?
I believe that assignment is atomic and would not need a lock.
yet most of the other dictionary use cases are not threadsafe. For
example I suspect that you'd get an error if you were iterating through
the dictionary while another threa
Stéphane Ninin wrote:
> Hello,
>
> Probably a stupid question, but I am not a multithreading expert...
>
> I want to share a dictionary between several threads.
> Actually, I will wrap the dictionary in a class
> and want to protect the "sensitive accesses" with locks.
>
> The problem is I am not
Jeffrey Barish wrote:
> Several methods in Queue.Queue have warnings in their doc strings that they
> are not reliable (e.g., qsize). I note that the code in all these methods
> is bracketed with lock acquire/release. These locks are intended to
> protect the enclosed code from collisions with ot
[Jeffrey Barish]
> Several methods in Queue.Queue have warnings in their doc strings that they
> are not reliable (e.g., qsize). I note that the code in all these methods
> is bracketed with lock acquire/release. These locks are intended to
> protect the enclosed code from collisions with other t
Oleg Paraschenko wrote:
[snip]
In my case "Hello" works and "Quit" doesn't (GUI stays frozen).
Linux, Python 2.3.3, pygtk-0.6.9.
That's not a multithreading issue, but just the way the quit method works.
Try:
-
import time
from Tkinter import *
root
Hello John,
> Mark,
>
> I tried your code snippet with Python 2.3.4. Worked fine. Only
problem was
> that the program fell off the end and terminated before the second
thread
> could open the Tkinter window. So I added these lines at the end to
make the
> main thread wait:-
>
> from msvcrt import
> Date: Thu, 16 Dec 2004 11:59:53 GMT
> From: "John Pote" <[EMAIL PROTECTED]>
>
> "Mark English" <[EMAIL PROTECTED]> wrote in message
> news:[EMAIL PROTECTED]
> Is there a safe way to run tkinter in a multithreaded app
> where the mainloop runs in a background thread ?
>
>
> I tried your code
"Mark English" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
Is there a safe way to run tkinter in a multithreaded app where the
mainloop runs in a background thread ?
Mark,
I tried your code snippet with Python 2.3.4. Worked fine. Only problem was
that the program fell off the
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