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From: Paul <nospam@needed.invalid>
Newsgroups: comp.lang.c
Subject: Re: xxd -i vs DIY Was: C23 thoughts and opinions
Date: Mon, 3 Jun 2024 14:41:43 -0400
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On 6/3/2024 4:02 AM, Michael S wrote:
> On Mon, 3 Jun 2024 03:15:27 -0000 (UTC)
> Lawrence D'Oliveiro <ldo@nz.invalid> 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.
> 
> The word "container" has many meanings.
> As far as host FS is concerned, guest FS is a one huge file. Despite
> very different tech under the hood it equally applies both to WSL and
> to WSL-2. Calling this file 'container' sounds like proper use of the
> term.
> 

I finally found a slightly older Win10 setup on an SSD.
It has WSL1.

It's uncontained. I put Ubuntu 18.04 in WSL1, because it had
no distro. This is an example of a file in the slash tree, in /usr/lib .
Permissions are restricted in the tree, and Everything.exe search
tool, I think it failed to index this tree of files.

C:\Users\Bullwinkle\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu18.04LTS_79rhkp1fndgsc\
     LocalState\rootfs\usr\lib\x86_64-linux-gnu\perl5\5.26\vars.pm

A process called "init" can be seen running in Task Manager.

This is a test of the / tree for speed.

bullwinkle@DRAX:/$ dd if=testfile.bin of=/dev/null bs=1048576
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.06495 s, 520 MB/s
bullwinkle@DRAX:/$ ls -al testfile.bin
-rw-rw-rw- 1 root root 1073741824 Jun  3 13:57 testfile.bin
bullwinkle@DRAX:/$

The /mnt/c speed is next. I didn't bother shutting off Windows Defender for this.
It's close enough to device speed (SATA SSD), it's basically the same speed
as the other test.

bullwinkle@DRAX:/mnt/c/users/bullwinkle/Downloads$ dd if=WIN10-WADK.7z of=/dev/null bs=1048576
3453+1 records in
3453+1 records out
3621128316 bytes (3.6 GB, 3.4 GiB) copied, 7.41205 s, 489 MB/s
bullwinkle@DRAX:/mnt/c/users/bullwinkle/Downloads$ ls -al WIN10-WADK.7z
-rwxrwxrwx 1 bullwinkle bullwinkle 3621128316 May 10  2021 WIN10-WADK.7z

   [Picture]

    https://i.postimg.cc/Y2RQd3LM/wsl1-with-ubuntu-1804-and-XMing.gif

*******

WSL2 on the machine I'm typing on, uses "ext4.vhdx" currently (6,698,303,488 bytes).
And that is a container. Instead of "init", "vmmemWSL" can be seen running. It
does not use third-party XMing Xserver, and uses WSLg instead for graphics. Either
of the two setups can run Firefox browser.

  Paul