Hi, I found the following link to get more insights about the memcpy performance of my board:
http://www.greyhound-data.com/gunnar/glibc/index.htm One can download a testsuite for memory performance and let it run. Not only memcpy, but also memcmp and memset is tested. This gave quite interesting results. Most of the time I get better values from optimized functions than from the glibc functions. As a rule of thumb: depending on the buffer size used, 15-20 % speedup, sometimes > 100% ! I will definetly integrate some of these functions in our software and then use -Wl,--wrap,memcpy on the linker line to replace all occurences of memcpy, memcmp, etc. also for external libraries. Best regards, Daniel Schnell -- Daniel Schnell | [EMAIL PROTECTED] Hugbúnaðargerð | www.marel.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matthias Fechner Sent: 16. maí 2007 18:03 To: linuxppc-embedded@ozlabs.org Subject: Re: MPC5200B memory performance Hello Daniel, * Daniel Schnell <[EMAIL PROTECTED]> [15-05-07 11:22]: > I get the following values on my board: my result is: Test (10000) memcpy of sizes (1024) .... 10000 memcpy. Time per memcpy: 1814 [nsec] (564 MB/sec) finished. Test (10000) memcpy of sizes (2048) .... 10000 memcpy. Time per memcpy: 3433 [nsec] (596 MB/sec) finished. Test (10000) memcpy of sizes (4096) .... 10000 memcpy. Time per memcpy: 6687 [nsec] (612 MB/sec) finished. Test (10000) memcpy of sizes (8192) .... 10000 memcpy. Time per memcpy: 21454 [nsec] (381 MB/sec) finished. Test (10000) memcpy of sizes (16384) .... 10000 memcpy. Time per memcpy: 205551 [nsec] (79 MB/sec) finished. Test (1000) memcpy of sizes (32768) .... 1000 memcpy. Time per memcpy: 379875 [nsec] (86 MB/sec) finished. Test (1000) memcpy of sizes (51200) .... 1000 memcpy. Time per memcpy: 588792 [nsec] (86 MB/sec) finished. Test (1000) memcpy of sizes (102400) .... 1000 memcpy. Time per memcpy: 1126511 [nsec] (90 MB/sec) finished. Test (100) memcpy of sizes (1048576) .... 100 memcpy. Time per memcpy: 11307890 [nsec] (92 MB/sec) finished. Test (10) memcpy of sizes (10485760) .... 10 memcpy. Time per memcpy: 120783600 [nsec] (86 MB/sec) finished. Test (5) memcpy of sizes (52428800) .... 5 memcpy. Time per memcpy: 673867800 [nsec] (77 MB/sec) finished. Best regards, Matthias -- "Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the universe trying to produce bigger and better idiots. So far, the universe is winning." -- Rich Cook _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
