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Posted by Jerry Stuckle on 01/08/08 02:12
Jeremy wrote:
> The Natural Philosopher wrote:
>> Jeremy wrote:
>>> every cycle saved on redundantly compiling PHP code is a cycle that
>>> can be used doing useful computation.
>>
>> Er.. what planet are YOU on?
>>
>> Unless you are totally CPU bound, most of the time your processor is
>> doing precisely nothing. Thats why its imporatnt to wortk out what
>> teh bottleneck is. Boosting CPU power may have as much effect as
>> fitting a turbocharger to a car that spends all its time in a traffic
>> jam..
>>
>>
>>
>>> NOT running a bytecode cache is pretty pointless. Why not do it?
>>>
>>
>> Because it may make no difference whatsoever. And adds more complexity.
>>
>>> Jeremy
>>>
>
> So, you're saying it doesn't make any sense to eliminate the compilation
> step on every request? That the request will be handled just as fast if
> many thousands of lines of code must be compiled first?
>
> Whatever planet I'm on, I want to move to yours - because computers
> there seem to be magical.
>
Sorry, I agree with Philo here. If the CPU is idle anyway, it's not
going to make any difference.
> Let's look at some benchmark tests:
>
> http://2bits.com/articles/benchmarking-apc-vs-eaccelerator-using-drupal.html
>
>
> In this particular case, adding APC resulted in a ~494% increase in
> performance over PHP alone. Maybe that's a result of Drupal being
> poorly written - couldn't tell you; I've never used it. But it seems
> like something that could potentially be pretty helpful, so I suggested
> he try it. I use it everywhere; it requires no maintenance, it installs
> in seconds, it has concretely improved the performance of my
> applications, and my servers have never crashed (with the exception of
> occasional fan failures) or required restarts. Anecdotally, I would say
> it's a pretty good thing to consider.
>
> Jeremy
>
Yes - IN THIS PARTICULAR CASE. That is not always true.
In in this case it would have hurt performance because a major portion
of his bottleneck was a shortage of memory. Now you just took more of it.
And BTW - your memcache idea would have taken even more of what he was
short of.
You're suggesting he steal bread from a starving man...
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
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