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Execution time measurement

Former Member

Hello,
I am using zedboard for my project and I want to measure my algorithm process time. The problem is that I can not use the clock() or gettimeofday() function, it says "undefined reference to _gettimeofday" or " undefined reference to _time", but in fact, I have already included the <sys/time.h> and <time.h>. I really need this problem to be fixed or any idea to measure the execution time.

P.S. My programmm is based on C and neon intrinsics, and the The Project is running on standalone. 

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    It's not that you don't have the right header - the link stage is failing because you don't have the libraries.

    I just reproduced your problem - my project is on "bare metal" at the moment too.  Calling the clock functions in "time.h" seems to cause a linker error:

    [code]
    Building target: CppPlay.elf
    Invoking: ARM g++ linker
    arm-xilinx-eabi-g++ -Wl,-T -Wl,../src/lscript.ld -L../../microZedAndIOCC_bsp_0/ps7_cortexa9_0/lib -o "CppPlay.elf"  ./src/dpiocc.o ./src/main.o ./src/platform.o   -Wl,--start-group,-lxil,-lgcc,-lc,-lstdc++,--end-group -Wl,--start-group,-lxilffs,-lxil,-lgcc,-lc,--end-group -Wl,--start-group,-lxilisf,-lxil,-lgcc,-lc,--end-group -Wl,--start-group,-lxil,-llwip4,-lgcc,-lc,--end-group
    /home/dean/Xilinx/SDK/2014.1/gnu/arm/lin/bin/../lib/gcc/arm-xilinx-eabi/4.8.1/../../../../arm-xilinx-eabi/lib/libc.a(lib_a-timesr.o): In function `_times_r':
    timesr.c:(.text+0x4): undefined reference to `_times'
    collect2: error: ld returned 1 exit status
    [/code]

    Perhaps the standard library is missing some functions, or we are missing a linker parameter.

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  • 0

    It's not that you don't have the right header - the link stage is failing because you don't have the libraries.

    I just reproduced your problem - my project is on "bare metal" at the moment too.  Calling the clock functions in "time.h" seems to cause a linker error:

    [code]
    Building target: CppPlay.elf
    Invoking: ARM g++ linker
    arm-xilinx-eabi-g++ -Wl,-T -Wl,../src/lscript.ld -L../../microZedAndIOCC_bsp_0/ps7_cortexa9_0/lib -o "CppPlay.elf"  ./src/dpiocc.o ./src/main.o ./src/platform.o   -Wl,--start-group,-lxil,-lgcc,-lc,-lstdc++,--end-group -Wl,--start-group,-lxilffs,-lxil,-lgcc,-lc,--end-group -Wl,--start-group,-lxilisf,-lxil,-lgcc,-lc,--end-group -Wl,--start-group,-lxil,-llwip4,-lgcc,-lc,--end-group
    /home/dean/Xilinx/SDK/2014.1/gnu/arm/lin/bin/../lib/gcc/arm-xilinx-eabi/4.8.1/../../../../arm-xilinx-eabi/lib/libc.a(lib_a-timesr.o): In function `_times_r':
    timesr.c:(.text+0x4): undefined reference to `_times'
    collect2: error: ld returned 1 exit status
    [/code]

    Perhaps the standard library is missing some functions, or we are missing a linker parameter.

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