I ran the Zend/bench.php script with PHP 5.0 and PHP 5.1 compiled with
GCC 3.3 and GCC 3.4 using different optimizations on my Intel Pentium-M
laptop:
HEAD (PHP 5.1.0-dev)
GCC 3.3.4 (-march=pentium3)
-O0: 48.602
-Os: 29.920
-O1: 31.349
-O2: 29.029
-O3: 29.644
GCC 3.4.2 (-march=pentium-m -mtune=pentium-m)
-O0: 48.966
-Os: 26.286
-O1: 29.253
-O2: 29.100
-O3: 27.767
-fprofile-{generate|use} -Os: 24.216
-fprofile-{generate|use} -O1: 26.575
-fprofile-{generate|use} -O2: 26.339
-fprofile-{generate|use} -O3: 25.537
PHP_5_0 (PHP 5.0.3-dev)
GCC 3.3.4 (-march=pentium3)
-O0: 58.394
-Os: 42.570
-O1: 43.454
-O2: 42.092
-O3: 42.066
GCC 3.4.2 (-march=pentium-m -mtune=pentium-m)
-O0: 59.272
-Os: 35.853
-O1: 38.275
-O2: 37.989
-O3: 41.020
-fprofile-{generate|use} -Os: 33.926
-fprofile-{generate|use} -O1: 36.853
-fprofile-{generate|use} -O2: 35.335
-fprofile-{generate|use} -O3: 38.897
For the -fprofile-{generate|use} builds I used the Zend/bench.php
script, too, to generate the profile information. If we were to add
Makefile target (like GCC itself ("make profiled-bootstrap")) to the
PHP build that makes use of -fprofile-{generate|use} it would make
sense to use "make test" to generate the profiling information.
When I find the time I will repeat the benchmark on my AMD Athlon64 box
because I think the small L1/L2 caches of the laptop CPU affect the
performance of the bigger code generated through optimizations. You can
clearly see that code optimized for size (-Os) is faster than the more
aggressive -O1, -O2, and -O3 optimization levels.
--
Sebastian Bergmann http://www.sebastian-bergmann.de/
GnuPG Key: 0xB85B5D69 / 27A7 2B14 09E4 98CD 6277 0E5B 6867 C514 B85B 5D69
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