RE: [PHP] Which is quicker, if-else statements

hmm now u are talkin about caching , our systems guy is planning on using squid as the caching system is this a good idea ? >===== Original Message From Jason Sheets <jsheets@php.net> ===== >As a note Turck mmcache does optimization and also caches the compiled >scripts into shared memory. Zend also has the Zend Optimizer and Zend >Encoder. > >Turck mmcache is available at >http://www.turcksoft.com/en/e_mmc.htm > >The benchmarking I did with Turck mmcache showed that Turck was a little >over 15% faster than APC for my applications (over 35,000 lines with >over 25 classes). Turck comes with a nice web interface where you can >disable the cache or optimizer and also view the cached scripts. > >Jason > >On Tue, 2003-03-18 at 20:38, -{ Rene Brehmer }- wrote: >> On Wed, 19 Mar 2003 00:39:11 +0100, Ernest E Vogelsinger wrote about "Re: >> [PHP] Which is quicker, if-else statements" what the universal translator >> turned into this: >> >> >Noticeable? Probably not, except you're timing loops of a million or more >> >cycles... but it's clear that the second method needs more time (in terms >> >of cpu cycles) than the first one. >> > >> >In Intel speak, what would a compiler translate these code examples to? >> > >> >if (a == b) {} else {} >> > mov eax, {a} >> > cmp eax, {b} >> > jnz L01 >> >; the "true" block goes here >> > jmp L02 >> >L01: >> >; the "false" (else) block goes here >> >L02: >> > >> >As you can see there's two memory operations and one comparison. >> >> I'm totally lost here ... what does that mean??? >> >> Reminds me of assembler, except that assembler is more like: >> 0001 jnp e002 e003 0005 >> 0002 jmp e002 e003 0008 >> >> And so on (not sure if that's fully correct ... haven't touched assembler >> since '92) ... >> >> Please ellaborate Ernest ... >> >> >However, PHP is _not_ a compiler, it's an interpreter. It "compiles" >> >code >> >at runtime and has not the ability to perform exhaustive optimizations >> >which would cost far more time than can be gained within a single >> >execution. Additionally there's the time needed to parse the input stream >> >(tokenize, add to symbol table, execute token and expression parser, etc >> >etc). With interpreting languages the differences will rocket skyhigh >> >compared to compiled executables. >> >> Doesn't PHP precompile the files and shove the result into the cache? Or >> did I get that wrong ??? >> >> Rene >> >> -- >> Rene Brehmer >> >> This message was written on 100% recycled spam. >> >> Come see! My brand new site is now online! >> http://www.metalbunny.net >-- >Jason Sheets <jsheets@php.net> > >-- >PHP General Mailing List (http://www.php.net/) >To unsubscribe, visit: http://www.php.net/unsub.php