filequeue | simple file based queue in Ruby | Application Framework library
kandi X-RAY | filequeue Summary
kandi X-RAY | filequeue Summary
...is a simple file based queue written in Ruby that uses the Ruby File class in standard library to push and pop items into a queue. It's not web scale but is nice for lightweight async queuing apps.
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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:
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Install filequeue
On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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