Package: gcc-3.3 Version: 1:3.3.5-5 Severity: normal I found this page http://www.network-theory.co.uk/docs/gccintro/gccintro_43.html and i diceide to try it becouse i was curios of optimizations. And the results are little strange. I have two more configuration on woody and one redhat9 with default packages installed and updated. Here are results: Debian Testing: Linux version 2.6.8-2-686 ([EMAIL PROTECTED]) (gcc version 3.3.5 (Debian 1:3.3.5-5)) #1 Sat Jan 8 16:50:08 EST 200 5 carredas:/home/edmon# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Celeron(R) CPU 2.00GHz stepping : 9 cpu MHz : 1991.977 cache size : 128 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid bogomips : 3948.54 carredas:/home/edmon# gcc -Wall -O0 test.c -lm carredas:/home/edmon# time ./a.out sum = 4e+38
real 0m8.381s user 0m8.374s sys 0m0.004s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m8.409s user 0m8.360s sys 0m0.007s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m8.381s user 0m8.378s sys 0m0.004s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m8.339s user 0m8.333s sys 0m0.001s carredas:/home/edmon# gcc -Wall -O1 test.c -lm carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m5.644s user 0m5.641s sys 0m0.002s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m5.640s user 0m5.638s sys 0m0.002s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m5.647s user 0m5.646s sys 0m0.001s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m5.651s user 0m5.649s sys 0m0.000s carredas:/home/edmon# gcc -Wall -O2 test.c -lm carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m5.726s user 0m5.722s sys 0m0.002s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m5.731s user 0m5.723s sys 0m0.003s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m5.792s user 0m5.731s sys 0m0.008s carredas:/home/edmon# gcc -Wall -O3 test.c -lm carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m4.218s user 0m4.215s sys 0m0.003s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m4.186s user 0m4.182s sys 0m0.003s carredas:/home/edmon# time ./a.out sum = 4e+38 real 0m4.189s user 0m4.187s sys 0m0.001s Debian Woody: Linux version 2.2.19 ([EMAIL PROTECTED]) (gcc version 2.7.2.3) #1 Sat Jun 9 13:04:06 EST 2001 mail:~# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 5 model : 4 model name : Pentium MMX stepping : 3 cpu MHz : 171.309 fdiv_bug : no hlt_bug : no sep_bug : no f00f_bug : yes coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr mce cx8 mmx bogomips : 341.60 mail:~# gcc -Wall -O0 test.c -lm mail:~# time ./a.out sum = 4e+38 real 1m18.922s user 1m13.630s sys 0m0.010s mail:~# gcc -Wall -O1 test.c -lm mail:~# time ./a.out sum = 4e+38 real 0m46.862s user 0m45.240s sys 0m0.030s mail:~# gcc -Wall -O2 test.c -lm mail:~# time ./a.out sum = 4e+38 real 0m45.667s user 0m44.320s sys 0m0.010s mail:~# gcc -Wall -O3 test.c -lm mail:~# time ./a.out sum = 4e+38 real 0m22.718s user 0m21.730s sys 0m0.010s And REd Hat 9: Linux version 2.4.20-8smp ([EMAIL PROTECTED]) (gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)) #1 SMP Thu M ar 13 17:45:54 EST 2003 [EMAIL PROTECTED] root]# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.40GHz stepping : 9 cpu MHz : 2411.645 cache size : 512 KB physical id : 0 siblings : 2 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm bogomips : 4810.34 processor : 1 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.40GHz stepping : 9 cpu MHz : 2411.645 cache size : 512 KB physical id : 0 siblings : 2 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm bogomips : 4810.34 [EMAIL PROTECTED] root]# gcc -Wall -O0 test.c -lm [EMAIL PROTECTED] root]# time ./a.out sum = 4e+38 real 0m10.779s user 0m10.780s sys 0m0.000s [EMAIL PROTECTED] root]# gcc -Wall -O1 test.c -lm [EMAIL PROTECTED] root]# time ./a.out sum = 4e+38 real 0m5.161s user 0m5.140s sys 0m0.000s [EMAIL PROTECTED] root]# gcc -Wall -O2 test.c -lm [EMAIL PROTECTED] root]# time ./a.out sum = 4e+38 real 0m5.123s user 0m5.110s sys 0m0.000s [EMAIL PROTECTED] root]# gcc -Wall -O3 test.c -lm [EMAIL PROTECTED] root]# time ./a.out sum = 4e+38 real 0m3.245s user 0m3.240s sys 0m0.000s As you see result for testing for -O2 are worst than -O1 :( I am not very in compiling and so on . Maybe i am missing something. It will be good if bigger optimization gives better results:))) :) -- System Information: Debian Release: 3.1 APT prefers testing APT policy: (500, 'testing') Architecture: i386 (i686) Kernel: Linux 2.6.8-2-686 Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) Versions of packages gcc-3.3 depends on: ii binutils 2.15-5 The GNU assembler, linker and bina ii cpp-3.3 1:3.3.5-5 The GNU C preprocessor ii gcc-3.3-base 1:3.3.5-5 The GNU Compiler Collection (base ii libc6 2.3.2.ds1-20 GNU C Library: Shared libraries an ii libgcc1 1:3.4.3-6 GCC support library -- no debconf information -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]