2011-05-04 08:41, Domas Mituzas skrev: > Ohi, > >> The time it takes to execute the code that glues together the regexps >> will be insignificant compared to actually executing the regexps for any >> article larger than a few hundred bytes. > > Well, you did an edge case - a long line. Actually, try replacing spaces with > newlines, and you will get 25x cost difference ;-)
A single long line containing no markup is indeed an edge case, but it is a good reference case since it is the input where the parser will run at its fastest. Replacing the spaces with newlines will cause a tenfold increase in the execution time. Sure, in relative numbers less is time spent executing regexps, but in absolute numbers, more time is spent there. /Andreas samples % app name symbol name 283 8.6044 libphp5.so zend_hash_quick_find 188 5.7160 libpcre.so.3.12.1 /lib/libpcre.so.3.12.1 177 5.3816 libphp5.so zend_parse_va_args 165 5.0167 libphp5.so zend_do_fcall_common_helper_SPEC 160 4.8647 libphp5.so __i686.get_pc_thunk.bx 131 3.9830 libphp5.so zend_hash_find 127 3.8614 libphp5.so _zval_ptr_dtor 87 2.6452 libc-2.11.2.so memcpy 82 2.4932 libphp5.so _zend_mm_alloc_canary_int 79 2.4019 libphp5.so zend_get_hash_value 72 2.1891 libphp5.so _zend_mm_free_canary_int 59 1.7939 libphp5.so zend_std_read_property 55 1.6722 libphp5.so execute 52 1.5810 libphp5.so suhosin_get_config 51 1.5506 libphp5.so zend_fetch_property_address_read_helper_SPEC_UNUSED_CONST 48 1.4594 libphp5.so zendparse >> But the top speed of the parser (in bytes/seconds) will be largely >> unaffected. > > Damn! > > Domas > _______________________________________________ > Wikitech-l mailing list > Wikitech-l@lists.wikimedia.org > https://lists.wikimedia.org/mailman/listinfo/wikitech-l > _______________________________________________ Wikitech-l mailing list Wikitech-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikitech-l
