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 0  2  977

Number of concurrencies - In Apache's ab test, how many requests are there for 10 concurrencies?

Using the ab test tool that comes with Apache, how many requests will there be for 10 concurrencies? How is the concurrency calculated? Is it the number of requests per second or the number of requests within a certain period of time? {Code...} This sentence What it means is that Baidu’s average con...

PHP中文网 2017-05-16 17:03:46 0  2  795

Is there any code for concurrency stress testing of the API interface?

Is there any code for concurrency stress testing on the api interface? Is there any code for concurrency stress testing on the api interface? Is there any code for concurrency stress testing on the api interface?

chen 2022-11-25 16:50:41 0  2  812

nginx - apaceh concurrency issues

Requirements: Apache, as a web server, receives REST requests. The peak concurrent request volume is 500qps, the average is 50qps, and the time performance requirement is within 50ms. The current problem: The time from request initiation to program execution is about 20ms: the average program proces...

PHP中文网 2017-05-16 16:57:25 0  1  717

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  1419

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 0  1  605

php - cronrab scheduled execution script maximum execution time

Use crontab curl or wget to execute a php script regularly. It is found that the execution time of the script is up to 7 seconds, and the subsequent execution time will not be executed. Where can I set the running time of this script? Set_time_limit 0 has been set in the header of the php script.

迷茫 2017-06-24 09:42:18 0  2  1003

javascript - Is there any way to detect the execution time of a synchronous method in js?

Specifically, is there anyone who can detect the execution time of a synchronization method? If the execution time is too long, I will take the initiative to kill this method.

迷茫 2017-06-15 09:23:26 0  5  900

Event polling and execution of asynchronous code in node

The main thread of node executes js code. When it is an asynchronous operation, node will hand it over to libuv for execution, and then execute the code behind the asynchronous operation. After libuv is executed, it will be placed in a circular queue. libuv will have an event loop (Event Loop) simil...

世界只因有你 2017-07-05 10:39:22 0  2  867

Python executes two functions at the same time

I have now customized two functions def test(): {code...} def test1(): {code...} These two functions are two functions of an infinite loop. Now I want to make these two functions Two functions are executed simultaneously in the same PY file. I wonder if the experts have any good solutions. Newbie as...

欧阳克 2017-06-22 11:52:20 0  1  971

Modify sql data, the data is inaccurate in the case of concurrency

Guys, how do you solve this problem? This is a metaphor for increasing user gold coins ~ the data is inaccurate under concurrency.

P粉592730670 2022-08-08 09:01:40 0  0  761

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 0  2  1266

apache - If you want to find the performance bottleneck using ab work, how to set the number of concurrency (-c) and the number of requests (-n)

Use the ab tool to perform a stress test on a page to find out how many concurrencies it can support (response time is less than 10s). How to increase the number of concurrencies and requests? Should one parameter remain unchanged, or should both parameters (-n, -c) be made larger? If we want to get...

PHPz 2017-05-16 17:01:53 0  1  699

exec return value problem

Common PHP problem, I can’t figure it out. When I execute exec(), there is an update operation. Why are all the statements executed successfully, but the return value is 0. When I execute the same add operation, the return value is the normal number of record rows. I can’t figure it out. Is there an...

Dr_D 2019-11-20 14:26:10 0  0  873

Error when running index.php

Teacher Zhu, unzip your courseware file to the project directory and an error will occur when running index.php. The database name has been changed to myblog. Please check what the problem is, thank you! Notice: Undefined variable: catList in E:\MyStudy\Php\myblog\public\inc\header_inc.php on line 5...

iUnicorn 2019-04-06 18:35:40 0  4  1517

Concurrency, message queue, load balancing, caching, distribution, security, are these the highlights of your resume? Java fresh graduate, internship for more than half a year

Concurrency, message queue, load balancing, caching, distribution, security, are these the highlights of your resume? Java fresh graduate, internship for more than half a year

漂亮男人 2017-06-12 09:27:05 0  13  2050

redis - How does PHP prevent multiple processes from operating the same resource at the same time?

How does PHP prevent multiple processes from operating the same resource at the same time? For example: flash sale products in the mall? Stock lock? Avoid oversold inventory? What is the principle?

滿天的星座 2017-05-16 13:18:57 0  4  771

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  945

apache - When using the ab tool, set the number of requests to 2000 and the number of concurrency to 1000. However, the number of requests is divided into 10 requests of 200 to complete. Where is the concurrency reflected?

Use the ab tool in the windows environment, go to the ab tool directory and type the command ab -n 2000 -c 1000 http://test.com/ Does this mean that the total number of requests is 2000 and the number of concurrent requests is 1000? When running the test, it displays completed 200 requests. Why are ...

迷茫 2017-05-16 17:02:01 0  2  657