filequeue | Drop-in Replacement for fs that avoids Error : EMFILE | File Utils library
kandi X-RAY | filequeue Summary
kandi X-RAY | filequeue Summary
Drop-in Replacement for `fs` that avoids `Error: EMFILE, too many open files`
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QUESTION
I have a small peculiar task at hand and I couldn't figure out how to best implement a solution.
I have three workstations that are connected to a NAS running Ubuntu 20.04 LTS, via InfiniBand with 40gbps of bandwidth. This NAS is equipped with a 2TB NVMe SSD as write cache, and 7 RAID0 units as the main storage.
These workstations will spit out raw data to this NAS for later use, each of these machines will spit out somewhere around 6TB of data files each day, sizing from 100 - 300 GB each file. In order to prevent the network gets too crowded, I have them output the data to the NVMe cache first, then I plan to distribute the data files from there - exactly one file to each of the RAID0 units concurrently to maximize disk IO. For example, file1 goes to array0, file2 goes to array1, file3 goes to array2, and so on.
Now I am writing a script on the NAS side (preferably as a systemd service, but I can do with nohup) to monitor the cache, and send the file to these RAID arrays.
Here's what I come up with, and it is very close to my goal thanks to this post.
...ANSWER
Answered 2021-May-17 at 18:50The problem is that you don't generate new values of array in the worker threads but only when creating the threads in threadWorkerCopy.
The result will depend on the actual timing on your system. Every worker thread will use the value of array at the time when it reads the value. This may be concurrent to threadWorkerCopy incrementing the value or afterwards, so you may get files in different directories or all in the same directory.
To get a new number for every copying process, the number in array must be incremented in the worker threads. In this case you have to prevent concurrent access to array by two or more threads at the same time. You can implement this with another lock.
For testing I replaced the directory listing with a hard-coded list of example file names and replaced the copying with printing the values.
QUESTION
I'm writing unit-tests for an application that uses Python's built-in cmd.Cmd class. I'm writing test-cases to test the shell program, which listens for user input on sys.stdin. In the constructor arguments for Cmd, there is an stdin parameter.
I have a Shell class that inherits from Cmd:
...ANSWER
Answered 2021-Mar-11 at 00:31Use os.pipe().
Anything you write to the write end of the pipe will be read from the read end. Shell won't read EOF until your test code calls self.stdin.close().
Writing to a pipe is buffered, so you also need to flush after writing to it.
QUESTION
I am using Python sounddevice library to record audio, but I can't seem to eliminate ~0.25 to ~0.5 second gaps between what should be consecutive audio files. I think this is because the file writing takes up time, so I learned to use Multiprocessing and Queues to separate out the file writing but it hasn't helped. The most confusing thing is that the logs suggest that the iterations in Main()'s loop are near gapless (only 1-5 milliseconds) but mysteriously the audio_capture function is taking longer than expected even tho nothing else significant is being done. I tried to reduce the script as much as possible for this post. My research has all pointed to this threading/multiprocessing approach, so I am flummoxed.
Background: 3.7 on Raspbian Buster I am dividing the data into segments so that the files are not too big and I imagine programming tasks must deal with this challenge. I also have 4 other subprocesses doing various things after.
Log: The audio_capture part should only take 10:00
...ANSWER
Answered 2020-Aug-20 at 15:43The documentation tells us that sounddevice.rec() is not meant for gapless recording:
If you need more control (e.g. block-wise gapless recording, overlapping recordings, …), you should explicitly create an InputStream yourself. If NumPy is not available, you can use a RawInputStream.
There are multiple examples for gapless recording in the example programs.
QUESTION
I have a TObjectList, where TUSBDevice is a class I've made. I tried calling Delete with the index passed as a parameter but that it simply does what TList.Delete() does: removes the pointer from the list but doesn't free the object itself.
The breakpoint I placed on TUSBDevice.Destroy() doesn't break when Delete() is called. I also had a watch on the TObjectList and I can see the item gets removed from the list but the contents at the memory address of the object don't get freed.
Destructor of TUSBDevice:
ANSWER
Answered 2020-Mar-15 at 12:15It's impossible to answer your question since it doesn't contain a minimal reproducible example; the issues doesn't lie in the code you posted, but elsewhere.
Still, the most common cause of an "overridden" destructor not running is that it is in fact not overridden. So I can almost bet that your Destroy declaration is missing the override:
QUESTION
I have an executable jar file I compiled from my program and I ran it on my PC. It works perfectly fine when I ran it in my command prompt using java -jar [nameofjar.jar]
However, I tried testing it on another pc. Using command prompt to run the same jar file, it throws an error:
...ANSWER
Answered 2018-Dec-10 at 04:24The root cause is that there were no lines to process.
You appear to only create prepared statements inside the for (String line : lines) { loop. But you only close the last statement you created (outside that loop).
When you don't have any lines, preparedStatement is null, because you never created one.
Even when you have lines to process, you are creating lots of prepared statements but only closing the last one.
You should probably create one prepared statement at the start of the method and reuse it for the whole method, closing it at the end.
QUESTION
I wrote a servlet page in java to retrieve records from a table in MySQL. Then , I will call the servlet page in JSP page to display the results on the browser.
MyServlet.java :
...ANSWER
Answered 2018-Dec-04 at 10:25Try remove space in MyServlet and better add a package from MyServlet class. Like org.app.MyServlet.
/Servlet means that URL for this servlet is {hostname:port}/Servlet, not a MyServlet (View table)
And don't forget about application name. If you project deploy with name 'myapp' (and your index page is {host:port}/myapp) then all your servlets intercept this paths: "{host:port}/myapp/{url-pattern from servlet-mapping}".
Try this in web.xml:
QUESTION
I am using PDFBox to extract text from PDF documents. Then once, extracted, I will insert those text into a table in MySQL.
The code:
...ANSWER
Answered 2018-Nov-29 at 16:41Your current code uses the string pdfFileInText which is gathered from tStripper.getText(document); and gets the whole document at once. First refactor all what you do with this string (it starts with pdfFileInText.split) in a separate method, e.g. processText. Then change your code to this:
QUESTION
I've been thinking for a long time and couldn't figure a way to tackle this issue.
I have a Java program that reads a table from MySQL that has Active status. The table looks something like this:
...ANSWER
Answered 2018-Nov-26 at 12:06There are several ways to handle this but I would remove the try/catch from inside extractDocuments and have it around the call to the same method in in doScan_DB
QUESTION
I have a method in Java requires to scan through a table in MySQL that looks for filepath.
Here is a sample table filequeue:
...ANSWER
Answered 2018-Nov-23 at 08:15You can get the path and file by
QUESTION
Hello my problem is I have a multithreading copying class. And the copying works well, but the program is dont quit because the threads are still alive after copying. I tried to build in a thread event, but this has no effect. The t.join() is never ending because the threads are alive. I also turned them daemonic, but this is unwanted, because the program ends but the threads are still alive when the program stops. Has anyone an idea what is wrong here? The Input of the class is a dataframe with the file source in first column and file destination in the other column
...ANSWER
Answered 2018-Nov-20 at 11:29Your worker thread is blocked on self.fileQueue.get(), that's why it's not checking the stop event.
The most easiest way to solve this is to make the thread a daemon thread. That way they'll automatically get terminated when the main thread terminates.
If for some reason you don't want to/can't do this, then you'll need to wake up the worker thread by inserting a special marker value to the queue that your worker will check, if the worker sees this value from the queue, it should terminate itself.
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