HipHop PHP-字符串concat问题

Question

I'm having serious issues with string concatenation in HipHop->C++ compiled PHP scripts.

My scripts rely heavily on concatenating strings, it performs in 0.6 seconds with PHP and 60 seconds compiled with HipHop. That's almost a 10,000% difference!

Appears to be a problem with dynamic memory allocation, according to this article :

They prove our suspicions. Source code compilation brings major side effect known from other compiled languages ​​such as C, C++ or C#: slow string operations, and the need for StringBuilder functionality!.

HipHop compiled scripts are considerably faster in all other areas, giving a speed and memory improvement of around 50%, which is something important to my project.

My question is: what kind of trick could I pull (in PHP code) to force the HipHop compiled PHP scripts to pre-allocate the memory needed, or whatever, to stop this obscure dynamic memory allocation which causes intense slowdown. Or is there another clever little way of concatenating strings, or some kind of string-builder implementation?

Answer 1

HPHPc has been deprecated. Try using HHVM https://github.com/facebook/hiphop-php

Answer 2

Could you provide an example of how you're actually performing the concatenation, as seen in this post, there could be some simple improvements that could be made.

Optimizing PHP string concatenation