kill an external process (simulation ) if it is taking too long

2 次查看（过去 30 天）
Sajid Afaque
Sajid Afaque 2019-12-16
评论： Sajid Afaque 2019-12-19
Hey everyone,
even i am using the same stratergy ( https://in.mathworks.com/matlabcentral/answers/300633-external-program-run-kill-from-matlab ) to call an external function and pause for several minutes then kill the process.
it is fine when my external process get into some infinite numerical calculations or it gets strucks.
but my problem is it waits for "n" amount of time even for process that finishes early that n.
can any1 suggest any approach where it waits and kills only when the process gets struck.
it should not wait for the good ones.
  2 个评论
Rik
Rik 2019-12-16
Is it possible for your external program to create a flag file? Then you could loop a short pause and a check for the existence of the file.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

Guillaume
Guillaume 2019-12-18
You could use a timer for this, it would be something like:
killtimer = timer('ExecutionMode', 'singleshot', 'StartDelay', 5, 'TimerFcn', @killtask); %executes after 5 seconds
yourcodetostartyourprogram
start(killtimer); %start the timer
%...rest of your code as usual
and a seperate function
function killtask(~, ~)
try %wrap in a try catch so that if the program is already terminated we don't throw an error
yourkillcode
end
end
  3 个评论
显示 1更早的评论
Guillaume
Guillaume 2019-12-19
I don't understand why people ask a question, get answers that solve the very question they ask, then come back with "actually..." and different question. Why didn't you ask that in the first place?
If you want to interrupt a loop after a certain time simply put a time limit as part of the loop condition, something like:
tstart = tic;
while toc(start) < yourdelay
dosomething
end
Sajid Afaque
Sajid Afaque 2019-12-19
sorry for that Guillaume , but its a training for new guys like us.
we will get more exposed to the concepts.
w.r.t above loop, I tried even that,but one problem which i found when using that code was
1)imagine a condition ,where my external process is running and by mistake or due to some reason that tab(external process) get cancelled.in that case if above loop is implemented , i have to re-run the entire code
2)but when "while 1" loop is implemented,even if it get cancelled it will re-run ,but again here i face the initial problem(
https://in.mathworks.com/matlabcentral/answers/496814-kill-an-external-process-simulation-if-it-is-taking-too-long#comment_779425
)

请先登录，再进行评论。

Walter Roberson
Walter Roberson 2019-12-18
If you are using MS Windows then you can use .NET as described in https://www.mathworks.com/matlabcentral/answers/418173-run-programm-in-background-without-using-start#answer_335999 . You could loop checking the status at short interals.
If I recall correctly, I have read that you can create callbacks for .NET code; if that is correct, then perhaps it would be possible to create a callback when the process finishes normally; you could use that together with a timer() so as to kill the process if it runs too long.
  5 个评论
显示 3更早的评论
Sajid Afaque
Sajid Afaque 2019-12-19
thanks Walter,
i am partially understanding , as i am new and not yet comfortable with these terms.
can you please write and show me a demo code ? it would be a favour
Walter Roberson
Walter Roberson 2019-12-19
See the link I already posted as it shows creating the process.
I do not have a Windows MATLAB installed to test with so I cannot write complete code myself.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Startup and Shutdown 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by