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

 

Brett Kavanaugh: Embattled Trump nominee 'not going anywhere' (25 Sep 2018)

 

Rod Rosenstein: Russia inquiry chief set for Trump showdown (24 Sep 2018)

 

Electrical implant helps paralysed people to walk again (24 Sep 2018)

 

Dellen Millard killed father as he slept and inherited millions (24 Sep 2018)

 

Portuguese 400 year old shipwreck found off Cascais (24 Sep 2018)

 

Indiana school bus driver fired for letting kids drive (24 Sep 2018)

 

Weight Watchers drops 'weight' from name (24 Sep 2018)

 

Oil price jumps as Opec keeps output steady (24 Sep 2018)

 

S-300 missile system: Russia to upgrade Syrian air defences (24 Sep 2018)

 

Kenyan governor Okoth Obado charged over Otieno murder (24 Sep 2018)

more »

 

SF Gate

 

Why the gig economy may not be the workforce of the future (24 Sep 2018)

 

Telltale, San Rafael maker of video games, lays off most of its staff (24 Sep 2018)

 

Ship traffic, September 25 (24 Sep 2018)

 

Gilead facing doubts on Wall Street a year after billion Kite deal (24 Sep 2018)

 

Here are the celebs to look out for at this year's massive Dreamforce event (24 Sep 2018)

 

News site to investigate Big Tech, aided by Craigslist founder (24 Sep 2018)

more »


Site feed Updated: 2018-Sep-24 18:00