Environment mac 10.14 2.2 GHz Intel Core i7 APPLE SSD AP0512M (a partner below shows the opposite result, which is related to the hard drive) problem description when you look at the RocketMQ source code, you can see that there are two ways to w...
as mentioned in the question, is java multithreading a big promotion for programs with a large number of io? For programs with a large number of io, how can we improve the speed without adding hardware ...
there is a saying that "the disadvantage is that if the accessed data is not in the application cache, then each time the data will be loaded directly from disk, which will be very slow. " this is not easy to understand. So if the accessed data is not c...
Hello, everyone. I have a problem. update: in fact, outputstream.write is an additional operation, not a rewrite. For example, after the first write and flush , flush can also be pushed to the client, and it is appended. My problem is that the su...
Code in ViewController: class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() Do any additional setup after loading the view, typically from a nib. let anyobjectype : AnyObject.Type = (NSClassFromS...
scene description If the cycle processes some data and fails to process one, record the current offset to meta.txt , so that after the program exception stops, the last offset is read after the program is restarted next time, and the processing c...
< H2 > scene < H2 > A csv file with more than 1 million entries, read, each line to be processed, and the average processing time per line 250ms . scenario 1: each read a line, process one line, deal with it, and read the next line. scenario 2: r...
problem description suppose that there is now a. Net program writing binaries to access the contents of the file through Java, so there will be conflicts. because it is a binary file, the bytes in it are randomly read through RandomAccessFile arf...
sendfile and mmap are both typical zero-copy technologies, and sendfile is very efficient when files do not need to be modified. It is said that mmap is more suitable for the transfer of small files, while sendfile is more suitable for large files. How s...
does it seem that kernel cache has been removed from data replication? ...
see a saying on the Internet < hr > Sequential IO mode (Queue Mode) concurrent IO mode (Burst Mode): disk controller may issue a series of IO commands to the disk group at a time, which is called sequential IO; if the disk group can only execute one...
for example: new byte [] {- 1} byte b = (byte) in.read(); is it possible to read a byte whose b value is-1 and belongs to video or audio? ...
another question, by the way, are there more Files classes or more Apache Commons IO classes that generally use Java 7 in development nowadays? ...
it is said that the this.props in react.js is the object passed from the parent component to the child component I print out the this.props to show the following what is in the this.props without a parent component? = is there any article that ...
if this error is reported when the figure is running, how to solve this problem in pycharm? Thank you! ...
when I saw the iterator on the Internet, I found it strange that the interface in C-sharp can inherit the original interface? Link: https: referencesource.micro. public interface IEnumerator<out T> : IDisposable, IEnumerator { ...
is developed by create-react-app, and there is a nested route, such as like home music. on the home page, the picture can be displayed, and the request address is correct static media , but under home music, a home, is added to the path in front of ...
redis master-slave replication is obviously different from clustering. The former is to provide redundancy and high availability, while the latter is to store data separately. Different redis nodes have different data. but mysql master slave and clu...