nginx - Are the number of requests per second and concurrency the same concept?

Windows tested the server using apache's ab -c 100 -n 1000 http://www.xxxxx.com and found that the number of requests processed per second was only 20, and the rest were waiting. Doesn't it mean that the default concurrency of nginx is very high? Or the number of requests processed per second and co...

某草草 2017-05-16 17:22:51 0  4  1430

How do PHP and MySQL handle concurrent requests?

I must be missing something about how PHP/Symfony handles concurrent requests, or perhaps how potentially concurrent queries on the database are handled... This code seems to be doing the impossible - it does it randomly (about once a month ) creates a copy of the new entity at the bottom. My conclu...

P粉037215587 2023-09-05 12:17:19 0  1  599

Concurrent queue processing system based on Swoole and Redis

Since PHP does not support multi-threading, as a complete system, many operations need to be completed asynchronously. In order to complete these asynchronous operations, we built a Redis queue task system. As we all know, a message queue processing system is mainly divided into two parts: consumers...

PHP中高级教程分享 2018-11-14 11:18:20 1  2  1530

python - How to deal with the concurrency problem of multiple requests being called at the same time during auction bidding in an auction system made with java? ?

The auction system has a function of bidding on prices. The current situation is that multiple requests are bidding at the same time. How to deal with this concurrency problem in the background, how to roughly analyze the business logic of who succeeds and who fails in this auction, and how to deal ...

阿神 2017-05-16 13:27:48 0  1  956

concurrency - Java concurrently processes a large amount of data in a table, how to set checkpoints so that they can be used for failure recovery instead of repeatedly processing the processed data?

Java concurrently processes a large amount of data in a table. How to set checkpoints for failure recovery instead of repeatedly processing the processed data? For example, if the system crashes during processing, and before kill -9 is used to force the kill, set a checkpoint and resume processing f...

滿天的星座 2017-05-17 10:08:26 0  1  727

Redis message queue problem

The following is my application scenario. For example, the client sends a request. At this time, the server needs to process the request and return it to the client. It should be noted that the user will wait for the return result in real time, so the faster the processing, the better. These tasks c...

天蓬老师 2017-06-16 09:19:17 0  1  1083

React18 microtask batch processing problem

useEffect(()=>{console.log("render");});consthandleClick=()=>{setC1((c)=>c+1);Promise.resolve().then(()=>{setC1((c)=>c+1);});};consthandleClick2=()=>{Promise.resolve().then

P粉506963842 2023-09-07 22:30:24 0  1  518

javascript - How to process the data returned by the server without submitting a get request with a custom xhr?

Prerequisite: The server can already process this get request and return the required data. I would like to ask: If this code is used in the HTML page to make a get request to the server: {code...} Then after the get request is sent, how can I obtain and process the data returned by the server as so...

PHPz 2017-05-19 10:42:58 0  1  728

Continue processing php after sending http response

My script is called by the server. I will receive ID_OF_MESSAGE and TEXT_OF_MESSAGE from the server. In my script I will process the incoming text and generate a response using parameters: ANSWER_TO_ID and RESPONSE_MESSAGE. The problem is that I am sending a response to the incoming "ID_OF_MESS...

P粉029327711 2023-08-27 20:36:33 0  1  670

MySQL Error 2006: The mysql server has disappeared

I'm running a server at my office to process some files and report the results to a remote MySQL server. The file processing takes some time and the process terminates midway with the following error: 2006, MySQLserverhasgoneaway I have heard about the MySQL setting wait_timeout, but do I need to ch...

P粉786432579 2023-08-23 17:47:00 0  2  642

python - celery+rabbitmq asynchronous task, queue messages keep increasing

When celery cooperates with rabbitmq to perform asynchronous tasks, it is found that the number of messages in rabbitmq is constantly increasing, but these messages have actually been processed by the task. Looking at the background of rabbitmtq, it is found that in Queued messages, the number of re...

高洛峰 2017-06-22 11:51:49 0  1  1147

java - Interview question, 100,000 devices are required to check the online status. What technology should be used?

I don’t know much about high concurrency, how should I deal with it? Are there any introductory books on high concurrency?

大家讲道理 2017-05-17 09:57:38 0  9  911

java - How to solve the pressure on scheduled task polling database

There are many scheduled tasks, and they are distributed on different servers. To poll the database for data that meets the conditions (status) and then process it. In this way, hundreds or thousands of scheduled tasks poll the database, which directly leads to a sharp increase in database pressure....

PHPz 2017-05-17 10:04:44 0  3  1255

Does local win7 TP5 use Redis to implement concurrent processing?

I am a newbie and I am making a purchase function. When there is only one item left but two people purchase it at the same time, how should I handle this situation? I only learned about Redis a few hours ago using the TP5 framework. I really don’t know how to use TP5. Is there any way to deal with t...

葫芦娃平衡盘 2018-03-14 18:34:12 0  4  1571

Am I able to use the mysql built-in function get_lock?

There is a batch job out there. And there are multiple servers that can handle the job. I only want the job to be picked up and processed by one of the many servers during a specific time. In order to achieve this purpose, when investigating the global lock mechanism, I discovered the get_lock funct...

P粉875565683 2023-09-15 21:20:11 0  1  715

Why can nginx handle high concurrency problems?

As mentioned, I see that many people are talking about nginx now. Can anyone give a detailed analysis?

曾经蜡笔没有小新 2017-05-16 17:27:32 0  2  693

javascript - js Is there any elegant way to communicate between two tabs that are open at the same time?

Here is an example: I opened two pages a and b at the same time. I focused on a and performed some operations, letting the js on page a process my operations and send the data to page b next to it. At this time, page b can receive these data and give feedback without refreshing or going through the ...

黄舟 2017-05-16 13:39:46 0  4  710

How to efficiently synchronize data in python multi-process or multi-thread?

In multi-threads/multi-processes, tasks can be easily obtained through queues and the like. But when the task is completed, in order to count the number of completed tasks, a value needs to be accumulated. In the current multi-thread/multi-process situation. I use thread lock/process manager + proce...

怪我咯 2017-06-12 09:24:09 0  1  875

javascript - A little doubt about nodejs handling concurrency

On a whim, I defined a route in express: {code...} The test is as follows, open N browser tabs; open the first tab and access localhost:3000/, open the second tab and access localhost within 6 seconds :3000/It is found that the first request is before the end of res.send() and the second...

巴扎黑 2017-05-16 13:39:29 0  3  699

Module 'pinia/dist/pinia.mjs' not found when running dev

I set up Pinia on top of a new Nuxt3 application and started the development server, using the following commands in sequence: npxnuxiininitnuxt-appcdnuxt-appnpminstallnpminstall@pinia/nuxtnpmrundev The development server ran without any issues. Then I put this line of code into "nuxt.config.ts...

P粉393030917 2023-10-26 23:04:01 0  2  1349