Re: [jamboost] Profiling output inaccuracy

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2002-07-22 09:18:55

From: "Vladimir Prus" <ghost_at_[hidden]>

> Say you call x which call x which calls x. I'll refer to function
instances as
> x1, x2 and x3 ;
>
> Cumulative time for x will include
> net time for x3 +
> net time for x2 + total time for x3 +
> net time for x1 + total time for x2
> and this is equal to
> net time for x1 + 2 * net time for x2 + 3 * net time for x3.
>
> You're counting the same time several times!

Hmm, no wonder recursive calls appeared to be so expensive!

It seems like a simple fix is possible - put an entry count on profile_info
and only accumulate cumulative time when it goes to zero.

-Dave