tungwaiyip.info

home

about me

links

Blog

< July 2009 >
SuMoTuWeThFrSa
    1 2 3 4
5 6 7 8 91011
12131415161718
19202122232425
262728293031 

past articles »

Click for San Francisco, California Forecast

San Francisco, USA

 

Exploring parallel programming

When I first started blogging, I have a lot of geeky posting about software development. The idea of blogging is to write on short subjects frequently. It is different from writing a long article, which is so burdensome many people end up not doing it at all. But in practice, I have not lived up to expectation of a prolific blogger. Sometimes the gap between postings can be a few months.

Anyway this is the quick posting on geeky subject that I think I should do more. Recently I am working on high performance computing and number crunching task. I have dipped into writing C extension for Python for performance. I got spectacular result from the exercise. It is the best of both world. Programming in Python supplement by C is still very agile and iterative. On the other hand C is giving the performance unachievable with pure Python.

I am started to look into the multiprocessing module introduced in Python 2.6. It is a library to run multiple python processes. With an interface similar to the threading module, it is positioning itself as an alternative approach to threading to circumvent the limitation of Python's GIL. I haven't give much thought to it initially. But looking closer, I find it is really more than just an alternative to threading. It is really a parallel programming framework. For example, the method Pool.map() is really a prototype of a mapreduce framework. I am quite excited to explore this module in the coming days.

Another module I am looking at is the ctypes module. It allows Python code to call C functions directly. Again I haven't thought much about it when it was introduced in Python 2.5. That's because I haven't have a use case of it. Now that I am writing C module, I begin to realize how revolutionary it is. C module delivery great performance. But writing one is a pain. Just the need to keep track of reference count may double the number of lines of your code. For me I am not building a reusable module for other people. It is one off function for me to do number crunching. Using ctypes may allow me easier access to C without the burden of actually writing a Python module.

2009.07.12 [, ] - comments

 

 

blog comments powered by Disqus

past articles »

 

BBC News

 

China landslide leaves 120 missing in Sichuan (24 Jun 2017)

 

Qatar says list of demands not realistic (24 Jun 2017)

 

UK tower blocks fail cladding fire tests (24 Jun 2017)

 

Brexit: Tory MP Leadsom says broadcasters should be patriotic (23 Jun 2017)

 

Schwarzenegger and Macron join forces in swipe at Trump (24 Jun 2017)

 

Lions well beaten in first All Blacks Test (24 Jun 2017)

 

Radiohead mesmerise fans at Glastonbury with a wayward, but compelling, set (23 Jun 2017)

 

Mosul battle: Second French journalist dies after mine blast (24 Jun 2017)

 

Colombia conflict: ELN rebels free Dutch journalists (24 Jun 2017)

 

Saudis 'foil suicide attack' on Mecca's Grand Mosque (23 Jun 2017)

more »

 

SF Gate

 

Bay Area News (7 Jan 2012)

 

City Insider (11 Feb 2012)

 

Crime Scene (13 Feb 2012)

 

C.W Newius Column (10 Jan 2012)

 

C.W. Nevius Blog (11 Feb 2012)

 

Education News (10 Jan 2012)

 

KALW (11 Feb 2012)

 

Matier and Ross Blog (11 Feb 2012)

 

ICYMI: ‘Game of Thrones’ will survive; stripper-pole battle (24 Jun 2017)

 

Martin Shkreli prepares for trial (24 Jun 2017)

 

Ether looks to unseat bitcoin at top of cryptocurrency heap (24 Jun 2017)

 

Google to stop reading your Gmail to help sell ads (23 Jun 2017)

 

We’re one step closer to getting cheaper, faster Internet from space (23 Jun 2017)

 

Rihanna gets ‘Stoned’; Tesla’s music; Fultz’s Instagram goof (23 Jun 2017)

more »

 


Site feed Updated: 2017-Jun-24 07:00