What is the difference between nts and ts in php

The difference between nts and ts in php: ts means thread safety, and a locking mechanism is used for multi-thread access. When one thread accesses certain data of this class, other threads cannot access it at the same time; while nts means non- Thread safety, no thread access protection is provided, multiple threads can operate the same data at the same time.

The operating environment of this article: Windows 10 system, PHP version 7.1, Dell G3 computer.

What is the difference between nts and ts in php

In the process of setting up PHP development and production environments, you need to install a PHP language parser. The official provides two types of versions, the thread-safe (TS) version and the non-thread-safe (NTS) version. Sometimes our development environment and the actual production environment are different, so we also need to choose to install the corresponding PHP version.

Record notes here for future reference...

1. Introduction

TS:

TS (Thread-Safety) means thread safety. When accessed by multiple threads, a locking mechanism is adopted. When a thread accesses certain data of this class, the data is locked and protected, and other threads cannot do so at the same time. After accessing the data, other threads cannot access and use the data until the thread completes reading. The advantage is that there will be no data inconsistency or data pollution, but it will take longer than NTS.

Select the TS version when PHP is loaded in ISAPI mode (commonly used by Apache).

NTS:

NTS (None-Thread Safe) is not thread-safe and does not provide data access protection. It is possible for multiple threads to operate the same data successively or simultaneously. In this case, it is easy to cause data confusion (that is, dirty data), and the execution time of general operations is shorter than that of TS.

When PHP is loaded and run in FAST-CGI mode, select the TNS version for better performance;

ISAPI:

ISAPI (Internet Server Application Programming Interface), usually refers to being loaded by the http server and running in the form of a server module. It was proposed by Microsoft, so it can only run on the win platform, such as apache and iis under win [fast cgi mode is more stable] , while php on Linux runs as Apache module (common method) or php-fpm (this method is more suitable for NGINX PHP operation).

CGI:

cgi (Common Gateway Interface): A tool for the HTTP server to "talk" to the program on the client machine. In short, cig is a backend language that can communicate with the server. At this time, PHP is running as an independent program, which is characterized by consuming memory.

FAST CGI:

fast cgi is a long-live CGI. It can be executed all the time. As long as it is activated, it will not run every time. It takes time to fork a new process. This method is a language-independent, scalable architecture CGI open extension. Its main behavior is to keep the CGI interpreter process in memory and thus obtain higher performance.

FAST-CGI is an improvement plan proposed by Microsoft to solve the shortcomings of the CGI interpreter. When a request is sent to the web server, the web server will always fork a CGI interpreter process to process the request. After the process is completed, the result will be returned to the web server. The web server will return the result and display it. The process ends. When the user When the same page is requested again, the web server will fork a new process to process the request, which will be inefficient (the main reason why CGI is criticized). If the FAST-CGI interpreter is used, the process will not be logged out after a request is executed, but the improved process will enter the dormant period. When a new request is received, the improved process will be re-enabled for processing. FAST-CGI reduces the resource usage of repeated creation of processes compared with CGI.

Processes and threads: A process has at least one or more threads.

2. Select

usually PHP Apache combination under win and run in ISAPI mode.

There are usually two types under Linux:

Apache PHP, PHP is generally run as a module of Apache;

Nginx PHP, in the form of phpfast cgi, that is, php -fpm mode has good performance for high concurrency and high load, so many websites use this method to build environments.

Nginx has much fewer configurations than Apache, so the probability of human error is less, but Apache is more stable than Nginx.

So much nonsense has been said before, the following is the key point...

Summary:

Use the TS thread-safe version when running in ISAPI mode

Use FAST- If running in CGI or PHP-FPM mode, use the NTS non-thread-safe version

Usually choose TS for Apache PHP under Windows, and choose TNS for PHP under IIS (fast-cgi)

Usually choose TS for Apache PHP under Linux , Nginx PHP choose TNS

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