| Re: Efficiency of a lot of variables [message #170862 is a reply to message #170856] |
Sat, 04 December 2010 03:24   |
Norman Peelman
Messages: 126
Registered: September 2010
Karma:
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Senior Member |
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jwcarlton wrote:
> I have 1,000 variables, written like this:
>
> // Block 1
> $hash['arr1']['var1'] = "whatever1";
> $hash['arr1']['var2'] = "whatever2";
> :
> $hash['arr1']['var10'] = "whatever10";
>
> // Block 2
> $hash['arr2']['var1'] = "whateverelse1";
> $hash['arr2']['var2'] = "whateverelse2";
> :
> $hash['arr2']['var10'] = "whateverelse10";
>
>
> There are 100 blocks, and 10 variables in each block. The block used
> is determined based on the domain used to access the site (there are
> 99 domains parked on top of the primary account). In the sample above,
> 'arr1' and 'arr2' represent the domains, and these are loaded on every
> page of the site.
>
> I've been researching this for awhile, and most seem to agree that
> it's faster / more efficient to store all 1,000 variables into arrays,
> instead of 100 blocks of if-else or switch-case. I had also considered
> having 100 text files, and then just loading the appropriate text file
> based on the domain (like below), but most believed that the I/O speed
> would be worse than just loading all 1,000 at once:
>
> $domain = "whatever";
> list($var1, $var2,..., $var10) = FILE("/path/to/variables-
> $domain.txt");
>
> So, I guess my first question is, do you guys agree that storing them
> all at once is faster / more efficient than the 3 alternatives? Or can
> you suggest another option that I haven't considered?
>
> If this is the best method, my next question is in regards to the
> construct of the arrays. In the sample above, I have a single
> multidimensional array; is that better than, for example, 100 arrays
> with 10 dimensions:
>
> $arr1['var1'] = "whatever1";
> $arr1['var2'] = "whatever2";
> :
> $arr1['var10'] = "whatever10";
>
>
> Or vice versa, 10 arrays with 100 dimensions:
>
> $var1['arr1'] = "whatever1";
> $var2['arr1'] = "whatever2";
> :
> $var10['arr1'] = "whatever10";
>
>
> I know that I'm probably worrying too much about microseconds, but I
> currently have an average of 600,000 pageviews a day, and expect it to
> increase to at least 12,000,000 within the next year, so I'm trying to
> make sure everything is as fast as possible before the problems set
> in :-)
>
> TIA,
>
> Jason
I'd look into using shared memory:
http://us3.php.net/manual/en/book.apc.php
--
Norman
Registered Linux user #461062
AMD64X2 6400+ Ubuntu 8.04 64bit
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