I read Is learning Perl the hard way the easy way? recently.
Andy Lester links to Learning Perl the Hard Way.
Reading the PDF, Allen B. Downey makes a great suggestion when learning new languages.
He says, “As you are experimenting with a new language, I suggest that you make deliberate errors in order to get familiar
with the most common error messages.”
That is some of the simplest, best advice I’ve heard in a while.
I’ve been trying to communicate with a perl process from PLT Scheme using the process library call from scheme/system.
I’ve been a good systems boy making sure that I call flush-output after every string I write to the perl process. But the perl process never gets any input unless I close the output side of the pipe connected to perl’s stdin filehandle.
After hours of no progress I found this
http://pre.plt-scheme.org/plt/doc/release-notes/mzscheme/MzScheme_300.txt
* File-stream output ports (including file ports, the initial output
port, and ports created by `subprocess’) are now block-buffered by
default, instead of line-buffered. The exception is when an output
port corresponds to a terminal, in which case it is line-buffered
by default. Also, the initial error port remains unbuffered.TCP output ports are block buffered (instead of unbuffered) by
default.The file-stream changes are especially likely to affect stdio-based
communication among OS-level processes. For example, when
communicating with an ispell subprocess, adding a newline at the
end of a command previously would have been enough to send the
command to ispell. Now, the output must be flushed explicitly
(using `flush-output’) or the buffer mode must be explicitly
changed to by-line (using `file-stream-buffer-mode’).The TCP changes affect most TCP-based communication. Explicitly
flush output using `flush-output’ or change the buffer mode using
`file-stream-buffer-mode’.
So I said what the heck, I’ll just add a (file-stream-buffer-mode outp ‘line)
call for grins.
And it started working.
I just read on Lambda the Ultimate that John Backus passed away this past Saturday.
I see this debilitating behavior every day, both in developers and managers. Most IS/IT managers get caught up in the word at a time or task at a time work flow that cripples teams and organizations. Senior developers and managers must be instructors and mentors in the enterprise. They must be experience practitioners of abstraction and modeling. Their first and most important priority must be to impart the skills of scale, abstraction, modeling, and reuse to those they mentor.
“Premature optimization ois the root of all evil.” Donald Knuth, paraphrasing C.A.R. Hoare
RubyQueue is an embarrassing parallel work queue system that simply uses NFS directories as a shared queue.
My master thesis was written in Scheme, so I’ve spend a long of time with PLT Scheme in the last year. DrScheme is cool for teaching others scheme especially in classroom settings. The editor key bindings however are atrocious. Enter DivaScheme to the rescue.
I build a program for my child every year for his birthday.
For his second birthday I wrote a flash card app using Ruby and Avalon on .NET.
So I needed to connect Ruby to .NET.
So pragmatism and laziness lead me to build a bridge.
Marshaling of primitives like integers are easy. The devil is in the details.
I start at Microsoft in the CLR team in January. I’m going to work making dynamic languages run better on the CLR.
We want to take IronPythons work and try to apply it Ruby. Can IronPython’s method dispatch be generalized and applied to Ruby?
Will dynamic languages be used in five years to build business applications? We hope so. How?
Success is when the intersection between “What you WANT to do” and “What you ACTUALLY do” increases.
The goal is Happiness.
How does the Ruby.CLR bridge work.
dynamic methods in the CLR will allow other projects liek Ruby.NET to implement Polymorphic Inline Caching(PIC).
const_missing allows faulting in of new proxy classes.
method_missing allows creating of method shims when faulting.
http://www.rubyclr.org
http://www.iunknown.com
Caution (re-review)
I can’t speak English well.
If I say strange English, you can see the slide page.
If you have questions please ask in Japanese, Ruby, Python, Lisp, Smalltalk, or Haskell, not english.
I got a job! My office is at Akihabara. Otaku City.
Akiba-Kei – Please check this word on wikipedia.
An Assistant of The Univ. of Tokyo.
RubyKaigi 2006 – 200 tickets sold out in 300 hours (DHH and Matz were the keynote speakers)
RubyKaigi 2007 – Dave Thomas and Matz are expected to keynote.
Koichi showed a simple scaffold rails app on YARV.
Congrats Koichi.
YARV
Simple Stack Machine
Specific VM Instructions YARV Instructions
Compiler
Interpreter (VM)
Many Optimization techniques to improve performance.
http://www.atdot.net/yarb/
RubyPorgram -> Compiler -> YARV Instruction Seq-> VM(Execution)
Optimizations
Compile time optimization
Direct threaded code
Specialized instructions
Operands/Instructions Unifications
Inline (Method) cache
Static stack caching
Profiler
more …
YARV doesn’t improve text processing,
YARV can assemble and disassemble assembly instruction sequences.
Instruction Sequences can be serialized and deserialized.
YARV will have a Mutex Class, but Thread.critical will become UNSUPPORTED with YARV. This will require Thrad.critical users to change there code.
Default threading model will be non-parallel with a giant lock, this allow existing non thread safe or non reentrant c extensions to continue to work.
#yarv irc.freenode.net, but Koichi is always marked AWAY, use mailing list.
http://i.loveruby.net/autobuild/yarv
YARV lacks a Hook interface
Needs to catch up to current 1.9
JIT/AOT Compiler AOT has been started but it is incomplete.
Compare vs. x10, Fortless Fortress?, Chapel
http://www.atdot.net/yarv/rc2006_sasada_yarv_on_rails.pdf
Streamlined: Quit Banging Rocks Together and Build Something
Admin and maintenance backends are repetative.
Streamline was built for our clients, based on our needs, to save our wrists. We know we’re a real project already because …. we are experiencing FUD. People say we’re a code generator, I’m here to clarify the FUD.
GOAL: Bring the declarative goodness of ActiveRecord to the view layer.
Scaffold suck, we need really good scaffolds, hence Streamlined.
Streamlined has a new look and feel called grail.
The fud exists because right now streamlined is kicked off as scripts/generate streamline. But really the generate script is just installing a plugin.
The way that we manage relationships should be introspective and flexible.
Views are GENERIC. But you can define custom views for fields. The generic views are overridable.
The key factor in the architecture is that all the configuration of streamlined is done in ruby.
streamlinedframework.org
gem install is coming this week
public svn is available.
Q: Will visual configuration write its data to the source code files
A: Yes
Q: Are you working on supporting Dr. Nicks magic models
A Not Yet, but we would really like to.
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