Showing posts from August, 2010

FW: How will Hama BSP different from Pregel?

Firstly, why did we use HBase?

Until last year, we were researched the distributed matrix/graph computing package, based on Map/Reduce.

As you know, the Hadoop is consists of HDFS, which is designed for commodity servers as a shared nothing model (also termed as data partitioning model), and a distributed programming model called Map/Reduce. The Map/Reduce is a high-performance parallel data processing engine, to be sure, but it's not good for complex numerical/relational processing requires huge iterations or inter-node communications. So, we used HBase as a shared storage (shared memory model).

Why BSP instead of Map/Reduce and HBase?

However, there were still problems as below:

OS overhead of running shared storage software (HBase)
The limitation of HBase faculty (especially, a size of column qualifier)
Growth of code complexity
Therefore, we started to consider about message-passing model, and decided to adopt the BSP (Bulk Synchronous Parallel) model, inspired by Pregel from G…

BBC's 50 Places to Visit Before You Die

Which Ones Have You Visited? 
1 The Grand Canyon USA
2 Great Barrier Reef Australia
3 Florida USA
4 South Island New Zealand
5 Cape Town South Africa
6 Golden Temple India
7 Las Vegas USA
8 Sydney Australia
9 New York USA
10 Taj Mahal India
11 Canadian Rockies Canada
12 Uluru Australia
13 Chichen Itza Mexico
14 Machu Picchu Peru
15 Niagara Falls Canada / USA
16 Petra Jordan
17 The Pyramids Egypt
18 Venice Italy
19 Maldives Maldives
20 Great Wall China
21 Victoria Falls Zambia / Zimbabwe
22 Hong Kong Hong Kong
23 Yosemite National Park USA
24 Hawaii USA
25 Auckland New Zealand
26 Iguassu Falls Argentina / Brazil
27 Paris France
28 Alaska USA
29 Angkor Wat Cambodia
30 Himalayas Nepal / Tibet
31 Rio de Janeiro Brazil
32 Masai Mara Kenya
33 Galapagos Islands Ecuador
34 Luxor Egypt
35 Rome Italy
36 San Francisco USA
37 Barcelona Spain
38 Dubai Arab Emirates
39 Singapore Singapore
40 La Digue Seychelles
41 Sri Lanka Sri Lanka
42 Bangkok Thailand
43 Barbados Barbados
44 Iceland Iceland
45 Te…

Vinay Deolalikar's P ≠ NP preliminary paper

예전에 어떤 전북대 교수님이 P = NP 라더니 그 연구 과정/결과 모든게 "구라" 였다라고 하더군 (나는 그 내용 잘 모름) ... 아직 검증결과는 안나왔다지만 사실 많은 사람들이 P ≠ NP 라 생각했던것 같다. 나는 구라여도 좋으니 그저 P = NP 신세계를 보여다오 :/