[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Tooltips GC overhead

From: Stefan Monnier
Subject: Re: Tooltips GC overhead
Date: Fri, 07 Aug 2015 13:26:54 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

> 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.


reply via email to

[Prev in Thread] Current Thread [Next in Thread]