[luatex] extreme slow down using pre release TL 2022 with lualatex

[Nasser M. Abbasi]

Thanks to everyone's help.

Update:

It is fixed now, thanks to Zauguin fix:

https://github.com/latex3/luaotfload/commit/8de37647676311d8fdd6825bd39690e97b6d9677

Changed the luaotfload-features.lua on my TL 2021 and changed it as shown
and now the same file finished compiling in about 40 minutes!

regards,
--Nasser

On 3/18/2022 3:47 AM, luigi scarso wrote:
> On Fri, Mar 18, 2022 at 1:12 AM Nasser M. Abbasi <nma at 12000.org> wrote:
> 
>> On 3/17/2022 2:52 PM, Patrick Gundlach wrote:
>>> Hello Nasser,
>>>
>>> do you still have this issue?
>>>
>>
>> Yes.  It slows down as the file size increased.
>>
>> lualatex is running. Not hanged or anything. But very slow.
>>
>> PID USER  PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
>> 21615 me  20   0  832316 816708   6592 R  99.7  1.6 392:40.05 lualatex
>>
>> The file has 9,000 problems (each on its own subsection, each problem
>> is read from separate latex file in separate sub folder).
>>
>> When I had about 6,000 problems, it was fast. About 1-2 hrs to compile.
>>
>> After adding more problems, I see the slow down.
>>
>> I see the output going to the terminal OK as we speak. But it takes
>> about 20-30 seconds to see one line printed after the other on
>> the terminal. Very slow.
>>
>> Initially the printed lines were coming to the screen
>> very fast (scrolling) but then the line scrolling becomes slower and
>> slower.
>>
>> At this rate it will take 10 months to compile this one file.
>>
>> The Latex file does \subimport to load individual latex file for each
>> problem. There are almost 9,000 \subimport in the latex file.
>>
>> When compiled to PDF it should be about 50,000 pdf pages.
>>
>> I can make a zip file with everything and the command I use to compile
>> if someone wants to see for themselves. But it will be large zip.
>>
> 
> I can check it , if you want.
> 
>