top time wasters in DMD, as reported by gprof
Peter Alexander
peter.alexander.au at gmail.com
Wed Jun 26 22:21:52 PDT 2013
On Tuesday, 25 June 2013 at 16:56:55 UTC, Andrei Alexandrescu
wrote:
> On 6/25/13 2:13 AM, Iain Buclaw wrote:
>> On 25 June 2013 07:46, Marco Leise<Marco.Leise at gmx.de> wrote:
>>> Am Mon, 24 Jun 2013 21:01:36 +0200
>>> schrieb Martin Nowak<code at dawg.eu>:
>>>
>>>> On 06/24/2013 08:43 PM, Martin Nowak wrote:
>>>>>
>>>>> I can try to install kernel debuginfo that 12% might
>>>>> contain some useful
>>>>> information.
>>>>
>>>> http://codepad.org/gWrGvm40
>>>
>>> Interesting. So to troll a bit, do I see it right, that dmd is
>>> mostly a Unicode conversion and memory allocation tool ?
>>>
>>
>> The D front end does nothing *but* allocate memory... and
>> sometimes
>> from all this allocation (if your computer doesn't die) a
>> compiled
>> program is produced.
>
> Then maybe it should use its own malloc that uses the
> bump-the-pointer approach from large chunks allocated with
> malloc.
The problem is not that malloc is slow, but malloc is being
called too much.
A hierarchical profile would be more useful here, to see exactly
what's allocating all that memory. I'm also intrigued as to why
so much string activity is happening (vfprintf!? num_to_str!?)
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