Re: Tooltips GC overhead

[Stefan Monnier <monnier@iro.umontreal.ca>]

> Without some kind of quantitative criterion, this sounds irrational to
> me.  Would a 0.001% slow-down be acceptable?  How about 0.1%?  There
> must exist some threshold below which any slow-down can be ignored,
> and the question I'm asking is what is that threshold?

For a functionality whose usefulness has not been proven, the threshold
is 0%.

> That something else was a watchpoint put on the variable, followed by
> semi-manual computation of the frequency distribution of functions
> that caused the watchpoint to fire.  That's exactly what a profiler
> would have done for me, if it were looking at that variable instead of
> counting calls to malloc.

I'd welcome a patch which uses such a "sampling watchpoint", since it
would even speed up the code by removing the code that counts calls
to malloc.


        Stefan