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Re: What makes set-window-buffer slow?

From: Clément Pit--Claudel
Subject: Re: What makes set-window-buffer slow?
Date: Fri, 24 Jun 2016 08:33:25 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

On 2016-06-24 02:54, Eli Zaretskii wrote:
>> From: Clément Pit--Claudel <address@hidden> Cc: address@hidden,
>> address@hidden, address@hidden Date: Thu, 23 Jun 2016 17:23:54
>> -0400
>> On 2016-06-23 15:11, Eli Zaretskii wrote:
>>> Instead of hypothesizing, I suggest to profile your code with 
>>> profiler.el.  If indeed redisplay is taking the time, you should
>>> see that in the profile.
>> The profile doesn't show that, unfortunately; in fact, we spent a
>> significant amount of time trying to understand what was taking all
>> that time by looking at the profile, but nothing in there was
>> taking more than 30% of the time, and even optimizing away a
>> function that according to the profile took 28% of the time didn't
>> yield a measurable runtime difference.
>> Commenting out the call to set-window-buffer (or predicating it on
>> the window not already displaying the buffer), on the other hand,
>> does yield a 95% performance gain.  set-window-buffer does not
>> appear in the profile; redisplay_internal does appear, but it only
>> is credited with 30% of the execution time.
>> I wonder what might explain these results...
> Any hope of seeing the profile, fully expanded?

Absolutely. I've attached it.

Attachment: mergesort-profile2
Description: Text document

Attachment: signature.asc
Description: OpenPGP digital signature

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