Hello Sebastian,
could you please repeat the tests for php 4.3 to see the interesting
difference? Also how about providing a spreadsheet for a better overiew?
How did you do the timeings, i assume time command? And what CPU did you
us, especially how much cache arewe talking about?
best regards
marcus
Monday, October 4, 2004, 8:30:47 PM, you wrote:
> 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
--
Best regards,
Marcus mailto:[EMAIL PROTECTED]
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