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QUESTION
I am using around 1500 process multiprocessing.pool to run tasks parallely.
In every process I need to perform a funtion every 5 mins, i.e every 5 mins I need to read 1500 files simultaneously.For every thread I am using time.sleep(300 - start_time) at the end of execution of function. However when trying to sleep only 16 process are executed because of 16 cores in my PC, rest all processes are not working.
below is the code:
...ANSWER
Answered 2021-Jun-04 at 17:02I do not think Pool or the way you do this is the best approach. If you have a Pool, it will have N workers that can run in parallel. By default N is the number of your cores. In your case the first thing a worker does is that it goes to sleep. It blocks the worker in the pool but it is not doing anything. You can try increasing the number of pool workers but you will most likely hit an OS limit of something if you try to launch 1500 workers.
My strong advice is to redesign your app so that you will do the sleeping and waiting somewhere else and only dispatch tasks to a Pool worker when the nap time is over. Not sure if it is suitable in your case, but you could combine threads and Pool. Make the napping happen in a thread and only dispatch a worker when there is work to be done, and remove all sleeps from your pool worker.
This is just a dummy snippet to demonstrate the idea but it runs.
QUESTION
Hi I want to keep my user logged in after their first log in until they log out by them self.
heres my Main.dartThis is the screen when you first time opening the app.
...ANSWER
Answered 2021-Jun-02 at 10:06using shared_preferences is an option here are the steps :
- if the user is logged in and authentified correctly save a local variable indicating the user is logged in (could be Boolean or string)
- every time the application opens and run check the stored variable
- if the variable indicate the user was already logged in skip the sign in screen
- else go to sign in screen.
here are some resources to help with shared_preferences
:
Update :
we need two methods you can define them in a new file and call it localService.dart
for example :
QUESTION
I made a simple replay buffer that when I sample from it gives me the error TypeError: 'type' object is not iterable
ANSWER
Answered 2021-May-30 at 15:52You're adding a type to your list, not an instance of the type. What you're doing is essentially the same as this:
QUESTION
I have a script that makes 3 application calls at one instance of the script run. the code is
...ANSWER
Answered 2021-May-26 at 15:40You may keep the last three PIDs of application instances you started (in the snippet of code below, I call these PIDs: last, penultimate, antepenultimate)
You start ONE single instance of your application in the loop.
You'll always wait for the oldest before starting another one. (modifying the list of the 3 last PIDs launched every time you start a new one).
This would give something like this:
QUESTION
df <- data.frame(Country = c("Indonesia","Indonesia","Brazil","Colombia","Mexico","Colombia","Costa Rica" ,"Mexico","Brazil","Costa Rica"),
Subject = c("Boys", "Girls","Boys","Boys","Boys","Girls","Boys","Girls","Girls","Girls"),
Value = c(358.000,383.000,400.000,407.000,415.000,417.000,419.000,426.000,426.000,434.000))
...ANSWER
Answered 2021-Mar-30 at 17:11Arranging your data frame does not change the way the column Country
will be ordered on the x axis. The priority for the order on the axis for discrete variables is:
- If you supply a
reorder
or final specification inaes()
, use that ordering - If the column is a factor, use the order of the
levels
of that factor - If the column is not a factor, order alphanumerically
As far as I know, you can only specify one column to use in reorder()
, so the next step is to convert to a factor and specify the levels
. The way the items appear in the ordering of the data frame does not matter, since the columns are treated completely separate from the order in which they appear in the data frame. In fact, this is kind of the whole idea behind mapping.
Therefore, if you want this particular order, you'll have to convert the Country
column into a factor and specify levels
. You can do that separately, or pipe it all together using mutate()
. Just note that we have to specify to use unique()
values of the Country
column to ensure we only provide each level one time in the order in which they appear in the sorted data frame.
QUESTION
I have a repository with the following method DoSomeWork:
...ANSWER
Answered 2021-Apr-22 at 14:22The most important part of unit testing is to identify the System Under Test (SUT). That's the thing that you'll actually be verifying works. Once you've identified that, all dependencies of your SUT should be mocked, so that you can tightly control everything external to the thing you're testing.
If you're trying to unit test MyRepoManager.RunTask, then it should not care about any of the internal implementation details of its dependencies. It should only care about the contract that they expose. In this case, you have a dependency on IMyRepository. So it's irrelevant what the concrete implementation MyRepository does. MyRepository might handle DatabaseTimeoutException and DatabaseDeadlockException internally, but that's an implementation detail, not part of the contract defined via IMyRepository. The goal is to mock the behavior of the dependencies, not completely reimplement the dependencies internal behavior within a mocking framework.
So, your mock setup should be:
QUESTION
I have been trying to understand how async/await keywords and promises work in NodeJs. Below is my test code:
...ANSWER
Answered 2021-Apr-04 at 08:59Quick disclaimer: I just read this and I might explain things a bit wrong.
The problem is that Node.js normally runs single threaded. But when running some sort of non-javascript operation it can "outsource" it and make it run parallel on the Kernel. But when you have a function like lowLevelFileRead
in your case, which doesn't run any sort of I/O operation it will be blocking the execution of other code.
Here is an article I found, which may help explain things:
https://medium.com/@mohllal/node-js-multithreading-a5cd74958a67
QUESTION
I have used google translate element with code:
...ANSWER
Answered 2021-Mar-19 at 06:14I struggled with this myself for a long time. I ended up having to learn a bit of JQuery to access the iframe and edit the text in the dropdown. Once I was able to access the text element I wrote a massive switch statement to change the text of the English version of the language into its native language. I used either google translate or the apps script LanguageApp to translate the language names.
QUESTION
I'm recently learning deep reinforcement learning and I wanted to apply what I learned to a problem from gym using Keras.
During training I realized that it is too slow, after checking the reason I saw that "fit" function takes so much time.
Running each episode takes 3-4 minutes.
Is there something wrong at what I'm doing? Or can you suggest an improvement?
...ANSWER
Answered 2020-Dec-19 at 19:16Your problem is not in the fit call, but in the loop that you have in the replay() method. Try always substituting loops by numpy operations in these cases, that make the operations much more agile.
Replace your replay method by the following one and let me know if it works faster for you
QUESTION
I have been creating a To Do List and it has two buttons per one entry which is Done to line-through finished tasks and Remove to delete it. And when I delete second item it deletes first instead of second. How can I fix this? Thank You.
Here's the HTML
...ANSWER
Answered 2020-Dec-11 at 13:36You have more elements with the same ID (doneButn
) - then the first one is targeted (ID haas to be unique).
Use function param to tell JS which element should be targeted.
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