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Profile Problem

Started by simha j January 18, 2002
hi,

i am using ccs2 for 621x.
I was Profiling a 'for loop' of my c-code which loops
for count 0, few equations in it.
For this case I got clock050.

but when i made count =1 (i.e., only one iteration),
I am getting clock = 550.

so for count 0, clock becomes 550*200 which is not
correct.

where i am going wrong????

looking forward to your replies.

bye



simha j wrote:

> hi,
>
> i am using ccs2 for 621x.
> I was Profiling a 'for loop' of my c-code which loops
> for count 0, few equations in it.
> For this case I got clock050.
>
> but when i made count =1 (i.e., only one iteration),
> I am getting clock = 550.
>
> so for count 0, clock becomes 550*200 which is not
> correct.
>
> where i am going wrong????
>
> looking forward to your replies.
>
> bye

What this sounds like, is that when you are running one iteration of the loop
you are not using
the software pipelined loop because of insufficient number of iterations. This
why the cycle counts
for a single iteration seem high. You need a certain minimum number of
iterations to get the loop
primed and busy. In fact it can be seen that your steady state performance is
75 cycles per
iteration as opposed to 550, which is a 7x improvement in performance. This is
what software
pipeling buys you, and in which case the saying "the more the meerier" is aptly
true.

Regards
Jagadeesh Sankaran


Hi !

I had a similar kind of a problem using the
profiler...
I found out that, when I single step for a single
cycle assembly instruction, the profiler clock used to
increment by 6 !

I think u could use the Statics manager of BIOS to get
the right clock Cycles....

All the best,
nikhil --- simha j <> wrote:
> hi,
>
> i am using ccs2 for 621x.
> I was Profiling a 'for loop' of my c-code which
> loops
> for count 0, few equations in it.
> For this case I got clock050.
>
> but when i made count =1 (i.e., only one iteration),
> I am getting clock = 550.
>
> so for count 0, clock becomes 550*200 which is
> not
> correct.
>
> where i am going wrong????
>
> looking forward to your replies.
>
> bye >
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