What to look at for php performance

What to look at for PHP performance?

When faced with a performance problem, the first step is always to find the problem reasons instead of looking at the tips list. Understand the cause of the bottleneck, find the target and implement the fix, then test again. Finding bottlenecks is only the first step in a long journey. Here are some common tips. I hope it will be helpful to find the bottleneck, the most important first step.

● Use monitoring methods (such as monitoring treasure) to conduct benchmarking and monitoring. Networks, especially network conditions, change rapidly. If done well, bottlenecks can be found in 5 minutes.

● Dissect the code. You must understand which parts of the code take the most time and pay more attention to these places.

● To find the bottleneck, please check each resource request (for example, network, CPU, memory, shared memory, file system, process management, network connection, etc...)

● First Benchmark iterative structures and complex code

● Conduct real tests with real data under real loads. Of course, it is best to use a production server if possible.

Caching

Some people think that caching is one of the most effective ways to solve performance problems. Try these:

● Use OPCODE (Operation Code) caching, This way the script won't be recompiled every time it's accessed. For example: enable the windows cache extension on the Windows platform. Can cache opcodes, files, relative paths, session data and user data.

● Consider using distributed cache in a multi-server environment

● Call imap_headers() before calling imap_header()

Compiling vs. Interpreting )

Compile PHP source code into machine code. Dynamic interpretation performs the same compilation, but it is performed line by line. Compiling to opcode is a compromise. It can translate the PHP source code into opcode, and then convert the opcode into machine code. The following are related tips on compilation and interpretation:

● Compile the PHP code into machine code before going online. Although opcode caching is not the best choice, it is still better than interpreted. Alternatively, consider compiling the PHP code into a C extension.

● PHP’s opcode compiler (bcompiler) cannot yet be used in a production environment

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