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From: David Brown <david.brown@hesbynett.no>
Newsgroups: comp.lang.c
Subject: Re: xxd -i vs DIY Was: C23 thoughts and opinions
Date: Mon, 3 Jun 2024 08:57:16 +0200
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On 03/06/2024 05:15, Lawrence D'Oliveiro wrote:
> On Thu, 30 May 2024 00:40:07 -0400, Paul wrote:
> 
>> WSL uses containers, so of course it is slow.
> 
> WSL1 had a Linux “personality” on top of the NT kernel. So this was
> emulation, not containers.
> 
> WSL2 uses Hyper-V to run Linux inside a VM. Again, not containers.
> 
> Linux has containers, which are based entirely on namespace isolation (and
> cgroups for process management). These are all standard kernel mechanisms,
> so there should be very little overhead in using them.

I can't answer for WSL, having not used it myself.  But I have used 
Linux containers of various sorts since OpenVZ (and even chroot jails 
before that), and there's no doubt that the overhead is usually negligible.

The whole deal with containers is that everything runs on the same 
kernel, but with different namespaces and file system root.  If WSL were 
to work by containers, it would need to run the Linux processes as 
processes under the NT kernel.  I suppose that might be possible, with a 
translation layer for all system API calls.  After all, you can run 
Windows processes on Linux with Wine - perhaps a similar principle can 
work for Windows?