El vie, 08-09-2006 a las 10:05 -0400, Matthew Miller escribió: > On Fri, Sep 08, 2006 at 10:59:10AM +0800, John Summerfield wrote: > > It's not all loss. I have a small benchmark written in Perl to exercise > > the CPU a little. > [...] > > use integer; > > This excercises the CPU only a very, very little -- a tight loop of integer > math with no system calls or anything. > > Change this to do floating point math and watch what happens. Hi folks, Just for fun i found at http://samba.org/junkcode/ an interesting and simple test http://samba.org/ftp/unpacked/junkcode/speed.c which i compiled as follows: [root at sparkbox bin]# export LANG=C; gcc -v -O2 -lm -o speed speed.c; export LANG=es_ES.UTF-8 Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.5/specs Configured with: ../configure --prefix=/usr --mandir=/usr/share/man -- infodir=/usr/share/info --enable-shared --enable-threads=posix -- disable-checking --with-system-zlib --enable-__cxa_atexit --disable- libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux Thread model: posix gcc version 3.4.5 20051201 (Red Hat 3.4.5-2) /usr/libexec/gcc/i386-redhat-linux/3.4.5/cc1 -quiet -v speed.c -quiet - dumpbase speed.c -auxbase speed -O2 -version -o /tmp/ccNWoHQq.s ignoring nonexistent directory "/usr/lib/gcc/i386-redhat- linux/3.4.5/../../../../i386-redhat-linux/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include /usr/lib/gcc/i386-redhat-linux/3.4.5/include /usr/include End of search list. GNU C version 3.4.5 20051201 (Red Hat 3.4.5-2) (i386-redhat-linux) compiled by GNU C version 3.4.5 20051201 (Red Hat 3.4.5-2). GGC heuristics: --param ggc-min-expand=100 --param ggc-min- heapsize=131072 as -V -Qy -o /tmp/ccoiuoVT.o /tmp/ccNWoHQq.s GNU assembler version 2.15.92.0.2 (i386-redhat-linux) using BFD version 2.15.92.0.2 20040927 /usr/libexec/gcc/i386-redhat-linux/3.4.5/collect2 --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -o speed /usr/lib/gcc/i386- redhat-linux/3.4.5/../../../crt1.o /usr/lib/gcc/i386-redhat- linux/3.4.5/../../../crti.o /usr/lib/gcc/i386-redhat- linux/3.4.5/crtbegin.o -L/usr/lib/gcc/i386-redhat-linux/3.4.5 - L/usr/lib/gcc/i386-redhat-linux/3.4.5 -L/usr/lib/gcc/i386-redhat- linux/3.4.5/../../.. -lm /tmp/ccoiuoVT.o -lgcc --as-needed -lgcc_s --no- as-needed -lc -lgcc --as-needed -lgcc_s --no-as- needed /usr/lib/gcc/i386-redhat-linux/3.4.5/crtend.o /usr/lib/gcc/i386- redhat-linux/3.4.5/../../../crtn.o Here are the results for mentionned host using acpi=ht, [root at sparkbox bin]# time speed & time speed & wait [1] 29836 [2] 29838 Floating point - sin() - 10.3853 MOPS Floating point - log() - 8.67528 MOPS Floating point - sin() - 1.93525 MOPS Floating point - log() - 9.25754 MOPS Memcpy - 1kB - 2542.87 Mb/S Memcpy - 1kB - 1238.97 Mb/S Memcpy - 100kB - 1933.49 Mb/S Memcpy - 100kB - 2237.83 Mb/S Memcpy - 1MB - 735.953 Mb/S Memcpy - 1MB - 783.704 Mb/S Memcpy - 10MB - 547.606 Mb/S Adding integers - 563.318 MOPS Memcpy - 10MB - 534.85 Mb/S Adding integers - 488.456 MOPS Adding floats (size 4) - 74.4939 MOPS Adding doubles (size 8) - 59.9683 MOPS real 0m4.887s user 0m2.431s sys 0m0.063s Adding floats (size 4) - 22.3984 MOPS [1]- Exit 13 time speed Adding doubles (size 8) - 46.3919 MOPS real 0m5.005s user 0m2.389s sys 0m0.056s [2]+ Exit 13 time speed [root at sparkbox bin]# [root at sparkbox bin]# time speed Floating point - sin() - 10.6428 MOPS Floating point - log() - 8.5237 MOPS Memcpy - 1kB - 3440.33 Mb/S Memcpy - 100kB - 3964.34 Mb/S Memcpy - 1MB - 1585.58 Mb/S Memcpy - 10MB - 971.622 Mb/S Adding integers - 608.727 MOPS Adding floats (size 4) - 48.3473 MOPS Adding doubles (size 8) - 66.073 MOPS real 0m2.622s user 0m2.212s sys 0m0.052s [root at sparkbox bin]# I know there's a new release of gcc in U4 and im still using the old 4.3, but in next weeks ill do the update... Good weekend all, Jose