如果您使用的是 Windows，情况可能不会像您希望的那么好； 不确定它是否会降低性能，但是 Windows 上的 Apache+PHP 通常比 Linux 上的 Apache+PHP 慢（有一次，我设置了一个运行 LAP 堆栈的虚拟机；它的响应速度与在 Windows 上运行 WAP 一样快）实体机^^)
A few things I've noted (I don't really know about eAccelerator, but I guess the ideas are the same) :
First access will not be faster : it has to compile PHP into opcode, and store it in memory ; only next access will be faster (it will not have to re-compile)
Activating APC, I've seen a CPU-load drop that can go up to 50% (ie, 80% of the server's CPU used before activating APC ; between 40% and 50% of CPU used with APC activated)
If not well configured, there was no real loss of performance, but things where not great either.
For instance, if not enough RAM is given to APC, and it is full, APC will have to remove some entries from the cache to be able to store new ones ; in the end, it'll spend quite some time to cache things, to un-cache them just after to cache new ones, and this, for each page-request. So, not good.
Another example is the "apc.stat" config entry (maybe there's something like this for eAccelerator) : if it's set to 1, for each accessed file, APC will check on disk if it has been modified, compared to the version in cache. If set to 0, APC will always use the version in cache, without checking the version on disk (it means you'll have to flush the cache to have a modification on a file be taken into account) ; setting this option to 0 can mean a drop of between 5 and 10 % of CPU load
If you are using Windows, things might not be as bright as you'd hope ; not sure if it could decrease performance, but Apache+PHP on windows is generally slower than Apache+PHP on linux (Once, I set up a virtual machine running a LAP stack ; it was responding as fast as running WAP on the physical machine ^^ )
Now, a couple of questions :
Which versions of Apache / PHP are you using ?
Maybe a "too recent" version ?
It seems there has been no new version of eAccelerator for quite some time, now ; last version is from May 2008 ; the previous one was from september 2007
Have you tried with APC, on which there is apparently more work done ?
What kind of result would you get with that one ?
Finally, for more informations, could you give us more informations about your environment and configuration ? And some details on the kind of benchmark you ran ?
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我从未使用过 eAccelerator，但我总是使用 APC ：
我注意到的一些事情（我不太了解 eAccelerator，但我猜想这些想法是一样的）：
如果您使用的是 Windows，情况可能不会像您希望的那么好； 不确定它是否会降低性能，但是 Windows 上的 Apache+PHP 通常比 Linux 上的 Apache+PHP 慢（有一次，我设置了一个运行 LAP 堆栈的虚拟机；它的响应速度与在 Windows 上运行 WAP 一样快）实体机^^)
现在，有几个问题：
您是否尝试过 APC，显然在这方面已经完成了更多的工作？
你会得到什么样的结果？
最后，如需了解更多信息，您能否向我们提供有关您的环境和配置的更多信息？ 关于您运行的基准测试类型的一些详细信息？
谢谢:-)
I have never used eAccelerator, but I always work with APC :
A few things I've noted (I don't really know about eAccelerator, but I guess the ideas are the same) :
If you are using Windows, things might not be as bright as you'd hope ; not sure if it could decrease performance, but Apache+PHP on windows is generally slower than Apache+PHP on linux (Once, I set up a virtual machine running a LAP stack ; it was responding as fast as running WAP on the physical machine ^^ )
Now, a couple of questions :
Have you tried with APC, on which there is apparently more work done ?
What kind of result would you get with that one ?
Finally, for more informations, could you give us more informations about your environment and configuration ? And some details on the kind of benchmark you ran ?
Thanks :-)