I do not know if I can answer the "real question", but I will be glad
to share what I know [and what i think].
The key thing to remember about the 'profile clock' is that it is
a counter [normally configured as a counter of DSP clocks]. On the
simulator, this models the DSP that has a separate hardware
counter. The count/clock input signal is selected by a mux [see the setup
options] - i think that 'clock' is the most useful [usually].
I have no idea what the purpose of the "time" is - all that I care about is
the number of clocks. If you are running in internal memory, you can
pretty much scale the clock count to time.
For timing programs in external memory, I would not use the
'fast' simulator [I have had problems in the past]. The EMIF
must be set up correctly. I personally have a fair amount of skepticism in
regard to the simulator modeling cache and external SDRAM. If I have
something that I want to run on the simulator, I try to get at least
alittle time on some hardware so that I can check the simulator
calibration.
The time that the simulator takes to execute code may not be directly
proportional to the time that the DSP will take. Two things matter -
simulator accuracy and 'number of clocks' [some might add
speed]. if the accuracy is good then convert the clocks to time using the
target speed of your choice.
I hope that this helps some.
mikedunn
qqzj tony <t...@yahoo.com.cn>
wrote:
is there anyone who can answer Imran's question?
I have the just the same douts
Imran Akthar
<i...@yahoo.com> wrote:
Hi there, I m using DM642 simulator,600MHz,CCS ver
2.2,WINDOWS 2000 OS. I have a algorithmn and i want to check
the time taken by it. I m using clock() function and getting
the result as number of cycles taken by the algorithmn. what i
have done is in the PROFILER->CLOCK SETUP,time taken by CPU
cycles as 1.67 ns. Pipe line adjustments as 0(default) my algoritmn uses lot of memory read and write operations,that
too external memory(in the linker file,i have used SDRAM space for
.sysmem(heap)). my question is
1)do i need to specify the time taken for memory read and write in PROFILER
->CLOCK SETUP(by default ,its 0 ns). 2)regarding the
clock() function,is the cycles it returns is of my PC or the DSP simulator which
m using. also,since the return value of clock()
function
is in cycles,its mentioned to use CLOCK_PER_SEC to get the time in sec.whats the
value of CLOCK_PER_SEC(is it the clock freq. of the dsp board,in my case m using
simultor having a freq of 600 MHz??). 3)also,while using the
simulator,its taking lot of time,for example,during one process,it took
approximately 10 minutes of my PC time,but the simulator results in cycles was a
value less that <600 MHz,taht means ..it takes less that 1 sec time,when i
want to calculate in terms of seconds.?? if m
right,then ,y the simulator takes so long time,??
and what when the algo,is put into the BOARD,will it give the same result
in terms of cycle and hence less than 1 sec??or will it take time as was taken
by my PC..that is 10 minutes..??
4)can i use DM642 using MATLAB/SIMULINK???
hope my questions are clear..??
well..m new to this CCS studio..so need help..
thanks
MA IMRAN |
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