khi gia

Heaven and Hell

Fri, 19 Jun 2009 23:29:45 +0800

Posted via email from Ludovic’s posterous | Comment »

hellotxting :)

Thu, 12 Feb 2009 21:10:21 +0800

hellotxting :)

antique junk

Sun, 08 Feb 2009 01:40:35 +0800

antique junk

Netezza muti-proc system give nearly always different ordering on the same query/same data (no...

Thu, 05 Feb 2009 11:52:38 +0800

Netezza muti-proc system give nearly always different ordering on the same query/same data (no ‘order by’ in query of course!). Even partitioned table in Oracle seems to give always same ordering.

Haskell tutorial for concurrency

Thu, 27 Nov 2008 19:11:15 +0800

Haskell tutorial for concurrency:

Great tutorial of all (lot) things about concurrency.

Written in Haskell, this is a good read even for non Haskell programmer. That’s a long time I’m saying I should digg into data paralell haskell … there are great example in the last part of this article.

join on command line

Thu, 27 Nov 2008 19:08:22 +0800

join -t’,’ -1 2 -2 1 -o “1.1 0 2.2” -a 1 f1 f2

This create a join of 2 CSV files f1 and f2, using column 2 as key for f1 and column 1 for f2, printing column 1 fo f1 and the key and column 2 of f2, and ensuring all lines of f1 are in output (left outer join).

Flash, disk or RAM?

Mon, 06 Oct 2008 22:53:35 +0800

Flash, disk or RAM?

blackhole

Wed, 06 Aug 2008 21:58:17 +0800

This is not a dead pixel on my LCD screen … this is a dead mosquito inside my screen :(

VB callback from C++ library

Tue, 29 Jul 2008 18:37:00 +0800

Spent few hours learning to call C++ from VB and VB from C++. It’s relatively easy (type convertion is ok, just be carefull that calling conventions is not the same in IDE (require std call conventions) and executable (both C and std are ok)).

Biggest problem is that a thread not managed by VB cannot call a VB callback (it’s here:http://support.microsoft.com/kb/q198607), so I will probably need to capture a VB thread (a windows timer thread also works) in my C++ API (through a blocking call) and share data between thread with a protected queue … all that to have a callback kind of thing from a C thread to the VB world!

Update: passing Variant from VB to C++ is not fun :(

My new homepage: Cuil

Mon, 28 Jul 2008 14:04:40 +0800

My new homepage: Cuil

cronjob on every 3rd Friday of the month

Sat, 19 Jul 2008 23:53:00 +0800

[[ `date “+%u”` == 5 && $(( `date “+%d”` / 7 )) == 2 ]] && do_my_job.sh

Update: this is NOT the 3rd Friday, this is the Friday of the 3rd week!
If you wanna 3rd Friday, simply check date +%u == 5 and 3*7 < date +%d < 4*7

High-order Perl

Sat, 12 Jul 2008 09:29:54 +0800

Reading “High-order Perl” … was hoping to reconciliate with the language … doen’t work as expected :(

http://books.google.com.sg/books?id=4_q8JJWNaTsC

"“The day Microsoft makes something that doesn’t suck is probably the day they start..."

Thu, 10 Jul 2008 14:16:37 +0800

“

“The day Microsoft makes something that doesn’t suck is probably the day they start making vacuum cleaners.” — Ernst Jan Plugge

I have nothing against M$ products … this just made me laugh :)

”

Neo FreeRunner (OpenMoko-based mobile phone)

Wed, 09 Jul 2008 23:22:48 +0800

Neo FreeRunner (OpenMoko-based mobile phone)

Purely Functional Data Structure

Wed, 09 Jul 2008 00:16:51 +0800

I thought this book will be tough and a bit boring … I was wrong: it is tough, but quite entertaining!

Each chapter describes shortly (clearly!) a data-structure or a technic, and end with few exercices … very interesting! (at least the first few chapters I’ve read). I will take some time to read and solve the exercices … arg, precious time is always vanishing!

Expert F#

Fri, 04 Jul 2008 23:22:48 +0800

I did pay SGD110 to buy Expert F# … more than worthy!

It’s really a very very good technical book about F# on course but also about programming technics in general.

I read only first few chapters for now … but I expect a *lot* of following chapters assuming that quality stay constant!

Thanks to the authors!

Emerging ideas ... why?

Tue, 01 Jul 2008 23:47:35 +0800

Recently, I have been reading/listening to presentations of SimpleDB, CouchDB and LiveMesh (and have seen some blog post about related projects in java, ruby and others).

Looks like there is some kind of common global idea of a distributed storage (I would say that Mesh is more than DB … much more … but I dont care in this post).

Yet the best explanation I got is from CouchDB presentation by Jan Lenhardt: big relational DB system have been developed for another kind of environement, not the environment in which we are, with so many resources (HDD, bandwith, CPU…).

But why everybody seems to be working on that same subject at the same time?

Is it because the resources are only available now? as a counter example, the web concept (hyperlinked documents) has been developed way before the technology (around 1945 if I am not wrong). So it’s not sure resource availability is an important factor; although concept and implementation are quite different.

It may be fashionable subject … or maybe a real need is present!

That’s good to see software engineering continuing its evolution!

Google archive ;)

Wed, 25 Jun 2008 00:50:05 +0800

At the time of writing, the wonderful blog post to explain how to make FSharp 1.9.2.17 work on mono is not available: http://laurent.le-brun.eu/site/index.php/2008/05/24/36-how-to-use-fsharp-1-9-4-17-on-mono

So I went to google to look into the cached … unfortunately, google did not refer this page!

Thus I used Google Reader which had this page! Thanks.

Now I have FSharp again on my linux :)

Discussion about twoorl and MI architectures

Sat, 07 Jun 2008 12:39:36 +0800

Discussion about twoorl and MI architectures

Jan on relational DB and new DB paradigm

Wed, 04 Jun 2008 00:24:05 +0800

Jan on relational DB and new DB paradigm