Two questions I am wondering about:
1. Is this still limited to x86 only, as I think was suggested on an
earlier thread related to this effort, or has it been generalized to
work across other CPU architectures?
2. As this evidently needs to be "enabled" by configuring processors to
act as ACs, once generalized across architectures to whatever extent is
possible and tested as stable, would there be any reason not to roll
this into 9front itself rather than keeping it as a separate project?
On 2/9/25 02:07, ron minnich wrote:
NIX this evening. Test on 4 core laptop.
fshalt -r does not end well on my laptop; it's the usual issue with
drivers not dealing that well with a warm reset, and hardware being hard.
So: I modified bootrc to drop me into rc before it starts mounting
file systems and such. I added execac to the image. fshalt -r 9pc64
and I can run execac as a test.
And it works on my T420 :-)
So, next step: try the fixed time quantum (FTQ) benchmark:
github.com/rminnich/ftq <http://github.com/rminnich/ftq> and compare
noise results from a TC and an AC.
ftq measures interference that can cause scaling issues in
supercomputers, more here:
https://www.researchgate.net/publication/4123211_Analysis_of_microbenchmarks_for_performance_tuning_of_clusters
We developed FTQ at LANL to measure noise. Some results here:
https://docs.google.com/presentation/d/1_BsQaO_0hdz8RSW1PAzMH6rVDQmdkwupfTmr-x5EXq4/edit?usp=sharing
In 2003 we got far better FTQ results on Plan 9 than on linux, which
is why in 2003 I started the Plan 9 for supercomputing project. We got
really good results on Blue Gene in 2007.
in 2011, I got the best results ever measured, and still the best on
just about everything I've ever seen in 25 years, using NIX on an AC.
These would have been great results on machine in single user mode,
but they were achieved on a fully booted machine running rio -- since
the AC was left alone to do its thing.
Here's hoping that still holds; I'll try it tomorrow. Will be pretty
nice to see if it works out.
But ... NIX is ready enough for you to try. I have no idea if it's any
use for anyone, but thanks to Paul for getting this port off the
ground, and Thierry, who kicked it into gear by asking the right
question at the right time.
github.com/rminnich/9front <http://github.com/rminnich/9front>, 9front
branch
On Sat, Feb 8, 2025 at 9:16 AM Paul Lalonde <paul.a.lalo...@gmail.com>
wrote:
Nice! Congratulations!
On Sat, Feb 8, 2025, 9:13 a.m. ron minnich <rminn...@gmail.com> wrote:
ok that's fixed and:
% ratrace -c execac -c 1 /bin/date
98 execac Running 204326 0x1prepage: base 0x7ffffefff000 top
0x7ffffffff000
prepage: base 0x200000 top 0x400000
prepage: base 0x400000 top 0x406000
prepage: base 0x406000 top 0x406000
/bin/date: timezone: file does not exist: '/env/timezone'
= process exited
% k
I *think* that means it worked.
First execac I've run in ... well ... a long time.
On Sat, Feb 8, 2025 at 8:17 AM ron minnich
<rminn...@gmail.com> wrote:
The new default branch is 9front.
https://github.com/rminnich/9front
I just pushed a commit that:
1. has the execac command use sysr1 for now
2. drops bootrc into a shell before root is mounted so you
can poke around and run execac
3. adds ratrace, execac, and date
When you build nix, look in systab.h, replace
[SYSR1] sysr1,
with
[SYSR1] sysexecac
it's just easier to coopt sysr1 for now
when you boot, make sure you have at least 2 cores; when
it drops to a shell, try this
execac -c 1 /bin/date
That would run /bin/date on core 1.
In a perfect world.
well ...
qunlock called with qlock not held, from 0xffffffff8021e5c2
qunlock called with qlock not held, from 0xffffffff8021e5c2
oops.
If you know how to debug qemu with gdb, well, here's a
place to start.
Or just look at what's at that PC in the kernel, and see
what it might be
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