hi,
I am wondering what you think about the capabilities of 9p compared to
http/1.1. Perhaps this seems like an odd comparison, but I think 9p and http
are broadly similar in purpose and functionality. While writing a simple
webserver, I got to thinking that http is really a very capable
On Sun, Nov 14, 2010 at 11:20:00PM -0500, John Floren wrote:
Please see lsub's Op and my Streaming talk at the most recent IWP9.
Ok, thanks. I did not know that 9p has latency problems even when reading a
single file. I was talking about pipelining, where you can ask the server to
send a dozen
On Mon, Jan 18, 2010 at 10:58:30AM +, Tim Climber wrote:
Is this possible for UNIX philosophy to develop further? Let's say,
XML-coded trees or graphs instead of one-line strings in stdin/
stdout.Or LISP S-expressions. New set of utilities for filtering such
streams, grep for XML trees,
On Mon, Dec 14, 2009 at 03:18:38PM -0200, Maur??cio CA wrote:
I also have an old plan of teaching professional computer
programming for blind people, since I watched a movie named
Sneakers, where a blind guy named Whistler uses a computer through
something that looks like some kind of braille
On Mon, Dec 07, 2009 at 12:24:05PM +, roger peppe wrote:
if you wanted it, an fd join driver could be simply
implemented in a similar way:
bind '#j4.5' /mnt/joined
open /mnt/joined/data to get a (read-only) fd that satisfies reads from fd 4
until eof, then fd 5.
That's not what I meant
the standard way of passing file descriptors is by fork/exec.
this allows security is handled by the normal means.
Erik/others, would you please give some feedback on my idea (a join call which
connects two fds together and disowns them from the process). Passing fds
around does not solve the
On Sat, Dec 05, 2009 at 08:26:20AM -0500, erik quanstrom wrote:
if you don't need to modify the data futher, then exec the guy who
does.
This is my issue - when I want to exec, too much of the request data has
already been read. I don't want to be calling read(fd, buf, 1) in a loop.
I would
On Sat, Dec 05, 2009 at 12:59:34PM -0800, Bakul Shah wrote:
You cut out the bit about buffering where I explained what I meant.
Your idea seems good, so long as the OS buffers data and keeps it around until
all readers have consumed it there would be no problem. This would be another
possible
I have two ideas for io functions that I think would be helpful, they are
alternative options to solve a simple problem really. I don't know if plan 9
has any functions like these already.
For example, when starting a CGI script for a POST request, a httpd reads the
http headers but typically
On Fri, Dec 04, 2009 at 08:36:29PM -0700, Lyndon Nerenberg wrote:
Another example, a little server that allows connections on a single port
443 for https and ssh. Ideally after reading the GET or ssh banner, it
can just exec whichever server is needed (or fork and exec something like
netcat).
On Sat, Dec 05, 2009 at 01:06:49PM +0900, Jun OKAJIMA wrote:
Currently not.
But maybe in the future?
If you want to do that (make it run on windows) you might like to look at
pendrivelinux.com which has various examples of firing up VMs to run linux from
a usb device under windows, the
Ethan Grammatikidis wrote:
I've had responsiveness issues when the viewing machine hasn't enough CPU
power to decode the screen data in real-time. A lot of power seems to be
needed, my PDA, a 416MHz ARM can't cope with any compression at all, I have
to limit vncviewer to copyrect and raw
hi Jun,
It looks interesting. Is there a windoze version under development? I suppose
there are suitable VM systems that run on windoze. Of course your potential
user-base grows if you support windoze! The VM could still run Debian or some
other OS of course.
Your page says it's safe to run
I don't know how hideously complicated it would be, to implement a module
interface that would support loading linux modules into whatever other OS such
as Plan 9. I suppose it would be vastly simpler than something like wine for
example. I think that would be useful, because so many devices are
On Thu, Nov 26, 2009 at 05:43:35PM +1100, Sam Watkins wrote:
I don't know how hideously complicated it would be, to implement a module
interface that would support loading linux modules into whatever other OS
such as Plan 9.
also perhaps it would be possible to run modules in userland, again
On Thu, Nov 26, 2009 at 05:51:37PM +1100, Sam Watkins wrote:
also perhaps it would be possible to run modules in userland, again drivers
needing access to direct memory-mapped devices and not doing that through the
kernel might be a problem.
sorry for repeated posting! apparently this DUSK
On Sat, Nov 14, 2009 at 01:30:12PM +1100, Bruce Ellis wrote:
Any one tried a Asus Eee PC T91? I claim it is the best outta the box
$500 computer available (this week anyway). I'm scribbling on it as I
speak. Touch/Swivel/Tablet screen, All the usual stuff and gps and tv
tuner and ... lotsa
On Sat, Nov 14, 2009 at 01:33:37PM +1100, Bruce Ellis wrote:
Contact me off list and I'll explain it.
I'd rather like to know why too, if you can post the reason to the list.
Sam
I think my main points were good.
* can parallelize by duplicating subsystems / divide and conquer
* can parallelize by pipelining, even down to the arithmetic level
* latency is limited by Ahmdal's law, potential throughput should not be
* multi-tasking can potentially use close to the
- a factory's line can be brought to a standstill if one of its
elements breaks;
one would hope that software elements do not break so much
- a factory 's line is at least as slow as its slowest worker
a slow part of the line can be split / duplicated to use multiple workers
- if all the
On Mon, Oct 26, 2009 at 08:49:41PM -0700, ron minnich wrote:
How is it that companies that want you to buy their IT expertise
outsource their own? It makes no sense.
It makes perfect sense - sell poor service+brand at high price, buy good
service at low price.
Sam
I wrote:
I calculated roughly that encoding a 2-hour video could be parallelized by a
factor of perhaps 20 trillion, using pipelining and divide-and-conquer
On Tue, Oct 20, 2009 at 03:16:22AM +0100, matt wrote:
I know you are using video / audio encoding as an example and there are
probably
On Wed, Oct 21, 2009 at 09:11:10AM -0700, Russ Cox wrote:
Can you give one example of a slow task that you think cannot benefit much
from parallel processing?
Rebuilding a venti index is almost entirely I/O bound.
Perhaps I should have specified a processor-bound task. I don't know much
On Fri, Oct 16, 2009 at 12:18:47PM -0600, Latchesar Ionkov wrote:
How do you plan to feed data to these 31 thousand processors so they
can be fully utilized? Have you done the calculations and checked what
memory bandwidth would you need for that?
I would use a pipelining + divide-and-conquer
On Sat, Oct 17, 2009 at 07:45:40PM +0100, Eris Discordia wrote:
Another embarrassingly parallel problem, as Sam Watkins pointed out, arises
in digital audio processing.
The pipelining + divide-and-conquer method which I would use for parallel
systems is much like a series of production lines
On Sun, Oct 18, 2009 at 01:12:58AM +, Roman Shaposhnik wrote:
I would appreciate if the folks who were in the room correct me, but if I'm
not mistaken Ken was alluding to some FPGA work/ideas that he had done
and my interpretation of his comments was that if we *really* want to
make things
On Thu, Oct 15, 2009 at 12:50:48PM +0100, Richard Miller wrote:
It's easy to write good code that will take advantage of arbitrarily many
processors to run faster / smoother, if you have a proper language for the
task.
... and if you can find a way around Amdahl's law (qv).
The speedup
There is a vast range of applications that cannot
be managed in real time using existing single-core technology.
please name one.
Your apparent lack of imagination surprises me.
Surely you can see that a whole range of applications becomes possible when
using a massively parallel system,
On Thu, Oct 15, 2009 at 04:21:16PM +0100, roger peppe wrote:
BTW it seems the gates quote is false:
http://en.wikiquote.org/wiki/Bill_Gates
maybe the Ken quote is false too - hard to believe he's that out of touch
Great idea, I like it :) I'll have a look at the code later.
You're using it on old unix/linux not plan 9 I guess? thanks.
On Fri, Oct 16, 2009 at 05:54:12AM +, Andy Spencer wrote:
My friend Mike and I were talking a while back about Unix init systems
and came to the conclusion that mk's
sqweek:
It seems to me the obvious way to gain consistency is to do the list parsing
in one place only:
hi sqweek,
Thanks for the thoughtful response. You are right, it could be fixed with
another tool like xargs. I wrote a similar tool modify which I use to modify
files in place with
you're retaining the inconsistency, but candy-coating it.
No, I'm offering a simple syntax using which one can avoid the inconsistency.
I'm retaining the option to have inconsistent behaviour, for backward
compatibility, and because some people seem to like it for command-line use.
cat *
I wrote:
I don't see how this can be fixed in unix without breaking umpteen million
shell scripts.
On Sun, Oct 04, 2009 at 06:12:15AM +0200, lu...@proxima.alt.za wrote:
By creating new commands with distinct new names.
I thought of a better way. We can fix the commands without breaking
Let's fix this now. Here is a one-line fix, which is simpler and cleaner than
a multi-empty-file commit. My old fix mkdir -p `lib/emptydirs` is a bashism I
think, I've reworded it:
xargs mkdir -p lib/emptydirs
That will suffice to fix the problem for unix users at least. xargs might not
be
hi,
I wanted to have a whinge about one fault I find in unix: commands such as cat,
grep etc. do not handle an empty argument list correctly. For example,
cat
should output nothing and exit - concatenating 0 files. Instead it copies
stdin to stdout, which is inconsistent. This problem
On Sat, Oct 03, 2009 at 10:01:09AM -0700, Rob Pike wrote:
cat * /dev/null
is the recommended solution.
Thanks Rob,
That works with cat, but it won't work with chmod, grep -L, ls, find, file
and many others. I think all of the unix and plan 9 utilities that deal
with a variable number of
I'd like to make a graphical shell which could do this sort of thing, it
would also have a textual format for saving and suitable for editing.
I think it would be good to have an equivalent graphical tool for each command
line tool, as powerful as the original one; and an editable graphical
On Thu, Oct 01, 2009 at 06:22:28PM +0800, sqweek wrote:
http://gsoc.cat-v.org/projects/kencc/
Looks good, I can't seem to find how to download that, is there anonymous hg
access or a tarball at all?
Speaking of hg - I think we should patch it to support empty directories so
that the inferno
I just installed 9vx under Linux on my eee pc, it's a delight to be able to run
2 or 3 instances of plan 9 with no bother under Linux! I can't really run Plan
9 as my main OS at the moment, but it seems there's not a big performance hit
to run it in 9vx.
I want to say thanks! to Russ for
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