Bug#750785: Slowness with context and xetex
On 14-08-09 11:47 AM, Khaled Hosny wrote:
> On Tue, Aug 05, 2014 at 03:04:03PM +0900, Norbert Preining wrote:
>> Hi Khaled,
>>
>> concerning the slowness in xelatex and context/xetex, I found now
>> which call is so delaying. I interspersed lots of printf and found that
>> most time the xelatex process is stucked in the following line
>> from XeTeXLayoutInterface.cpp:
>> shape_plan = hb_shape_plan_create_cached(hbFace, &segment_props, engine->features, engine->nFeatures, engine->ShaperList);
>>
>> Does this tell you *anything*? In Debian we are running with harfbuzz
>> 0.9.33 at the moment, and I also checked the sources, there is only
>> one completely unrelated patch that Debian adds.
>>
>> The whole output is mostly stucked in function layoutChars, where the
>> above call happens.
>>
>> Do you have any idea where the slowness could come from? It seems -
>> only from reading the name of the function - that maybe something
>> is not proberly cached?
>
> I don't really know, may be Behdad have some suggestions.
Not without more context (haha).
Print out the parameters being passed in to that function and we'll definitely
see why the cache isn't working.
Also a simple test document is appreciated. I'm cloning XeTeX now. Will see
how a build goes...
--
behdad
http://behdad.org/
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