process hangs when building hyperdoc pages in parallel

[Qian Yun]

I wonder if you have experienced that build process hangs
when building hyperdoc pages in parallel.

I can reproduce it around 50% chance on my machine if
build with -j8. Less chance if -j4 or -j6.

This almost never happens on github runners (-j4) before,
but it happens a few times in the last few days.
So I'd like to resolve the root issue of it.

Any pointers where I should look into first?

- Qian

[Grégory Vanuxem]

Hello Qian,

Have you tried without --output-sync? Personally I never use it on my machine and if memory does not deserve me I also never encounter this. I use this make option on GitHub workflows since you use it (I didn't know this option).

Just my two cents,

Greg

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[Qian Yun]

Uhh. It is caused by xvfb-run, not some race condition
between sman/hyperdoc/graphics.

My system comes with a very old version of xvfb-run.
It contains this line:

sleep "$STARTWAIT"

I think that when multiple xvfb servers are launched,
they may not get ready with in "$STARTWAIT" (default is 3 seconds).

Newer versions of xvfb-run use different method to detect
when xvfb is ready.

- Qian

[Grégory Vanuxem]

Oh, ok, I was wrong. I do not personally use xvfb, it reminds me of
when I was post-student and it was funny to use it with "real" TTY
(Ctrl-Alt-F2, CTRL-Alt-F3 etc...). We are in 2026 after all. BTW good
that you have found the root of the problem, you usually awesome me.

Greg (sincerely),

- Greg

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