btdu - a sampling disk usage profiler for btrfs (written in D)
doob at me.com
Tue Nov 10 09:40:33 UTC 2020
On Sunday, 8 November 2020 at 17:23:32 UTC, Vladimir Panteleev
> - D programs that build fine on one Linux machine may still
> fail to build with mysterious linking errors on another, even
> when using Dub which takes care of dependency management. I saw
> two counts of this, caused by differences in DMD/LDC and
> Arch/Debian (one being that, for whatever reason, libz is not
> pulled in on LDC/Debian despite being a Phobos dependency).
> Also, LDC is the D compiler that's installed by default when
> the system wants a D compiler (e.g. if you try do install Dub
> by itself).
I don't think this is specific to D. I've seen in the past
problems caused by package maintainers not building the package
in the same way as upstream. Or they split up a package in
> - The garbage collector is still a major hindrance for system
> programming. In this case it was due to the ioctls used being
> slow, and when the GC tries to stop the world to do its thing,
> it just hangs the entire program until ALL ioctls in all
> threads complete.
You should probably never let the GC run on a realtime thread,
like audio or video processing (not sure if ioctls falls into
this category). These days, modern UIs should probably fall into
the realtime category.
> This means it wasn't possible to have a stutter-free
> interactive UI, so I had to move processing to subprocesses.
I'm not sure if it's possible to ever have a completely
stutter-free UI with a stop-the-world GC.
> - One user wondered why the program needed so many threads. The
> answer was that half of them were owned by the GC (it never
> stops its worker threads, they just sit idle).
Is that the answer? I mean, the GC doesn't create any threads by
itself, does it?
> - I used the Deimos ncurses bindings package. I'm thankful that
> it already existed, though I had to push some fixes to fix
> static linking. The most annoying part was waiting overnight
> for code.dlang.org to pick up the new tags, because there is no
> way to get it to update a package unless you're the owner, and
> no way to otherwise specify a dependency unless using a branch
> (which is deprecated and prints a big warning when your users
> build your program).
Since 2.094.0, you can specify a Git repository as a dependency
. You can also specify a local path as a dependency ,
useful when developing a library and an application at the same
time, as two separate Dub packages.
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