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nginx high concurrency problem

nginx can support high concurrency mainly because of the network I/O model of epoll in the Linux 2.6 kernel. So I wonder, will the concurrency of nginx not work on Windows? Or on another system? So what network IO model does nginx use on Windows or other systems? Seeking heights...

怪我咯 2017-05-16 17:26:48

java - trade-off between sql performance and high concurrency

SELECT {code...} It is possible to simply use multi-table association. If high concurrency is encountered, performance defects will appear immediately.

PHP中文网 2017-05-17 10:09:04

php - How to check the execution order of Redis commands under high concurrency?

I have a question: I use the ab tool to test the program I wrote. Redis is used in the program. I want to know in what order redis executes commands under high concurrency conditions. The picture below was posted by a netizen. It is what I want, but I don’t know where or how he got it: ...

给我你的怀抱 2017-06-20 10:06:08

php+mysql high concurrency how to download data in a loop based on ID to avoid duplication (interface)

For example, the table content is id name1 a2 b3 c4 d. The first download id is 1. The second download id is 2. The third download id is 3. The fourth download id is 4. After the id is 4, it starts from 1 again, and it continues in an infinite loop. , must be able to support high concurrency! What I...

。。。。 2020-02-08 11:30:16

Concurrency - How does the nginx plug-in implement time-consuming operations in a non-blocking manner?

Problem description: Everyone knows that the reason why nginx has great performance is based on its asynchronous and non-blocking nature. Therefore, when developing nginx plug-ins to handle network requests, you must remember to perform certain time-consuming operations in a blocking manner. Otherwi...

phpcn_u1582 2017-05-16 17:12:26

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

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

Concurrency - the correct posture for python multi-process + coroutine?

What is the correct posture of python multi-process + coroutine? Is the following code an example of combining multi-process and coroutine? {Code...}

给我你的怀抱 2017-07-05 10:34:33

Can Laravel in php be applied to high-concurrency servers?

Recently, I have been confused by Laravel. When the number of visits increases a little, when the parameters of the configuration file are read through env, the parameters read in different sessions will be intertwined and confused. I'm really speechless. Is there any expert who can give me some adv...

A4哥 2020-04-17 20:58:03

java - Partial thread SessionException: Session is closed! when Hibernate adds operation under high concurrency conditions.

Servlet + hibernate will cause org.hibernate.SessionException: Session is closed! in some threads under high concurrency conditions, but it will not occur under single-threaded conditions. {code...} BaseDAO.java {code...}

我想大声告诉你 2017-06-12 09:22:23

web server - nginx module development or writing similar functions yourself

I can think of several situations where nginx modules must be used for development: 1 http access 2 High link management requirements 3 Ultra-high concurrency Are there other situations? In addition, I feel that as long as modules with high performance requirements are basically modified to open sou...

迷茫 2017-05-16 17:26:16

javascript - swiper.js does not work well when setting autoHeight when the content height is smaller than the screen height

Use swiper.js to implement tab item switching, but the height of each tab item is different, and the data is loaded asynchronously. For the adaptive height of swiper-container, autoHeight: true is set, but it is found that when the content height < screen height This attribute doesn't work anymor...

phpcn_u1582 2017-05-19 10:43:35

Help: Please tell me the approximate cost of some music listening websites.

Enter the music listening website below. Their music should be stored on the server they purchased, and its concurrency should be very high. . . What is the minimum server configuration required for this kind of website? . . .

极世 2018-07-10 18:05:25

redis - How to understand the atomic operation of memcache?

Memcache's add is atomic, that is, multiple processes are performing add operations at the same time, and no race conditions will occur. Does this mean that add will not generate concurrency? ?

大家讲道理 2017-05-31 10:36:15

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

java - The pros and cons of various methods for fastjson to handle date type conversion

{Code...} Please ask the experts for help, which one has better performance based on accurate conversion under high concurrency?

世界只因有你 2017-06-10 09:48:00

Python WoL script fails on Synology RS1221+ but runs successfully on QNAP TS-219P II

I'm relatively new to Python and I don't understand why the same script doesn't run on my RS1221+NAS but runs on the QNAPts-219pii with no issues. It is a WoL script designed to open a specific PC via an HTML page. You press a PNG image, which then calls a php script, which in turn calls said Python...

P粉395056196 2024-02-17 16:02:35

How to solve Hibernate's multi-threading problem?

I have a page that implements a function. Triggering this function will execute two java functions at the same time, thereby triggering two Hibernate operations. After executing this function, the system will issue this Exception from time to time: {code...} I personally think It's because the sessi...

淡淡烟草味 2017-05-17 10:07:17

nginx - How to understand the asynchronous non-blocking high-performance web server advertised by openresty?

I understand asynchronous and synchronous, whether it is blocking or not, but I just don’t understand how openresty implements asynchronous non-blocking IO and achieves high concurrency processing capabilities? I usually write Lua interfaces, but I can see considerable QPS when doing stress tests, b...

仅有的幸福 2017-05-16 17:10:59

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