...
- Cost effectiveness study
Cost calculations based on processing reqeusts for 36,000 mosaic of 2MASS images (Total size 10TB) of size 4 sq deg over a period of three years (typical workload for image mosaic service).
Results show that Amazon EC2 is much less attractive than a local service for I/O-bound application due to the high costs of data storage in Amazon EC2.
Tables below show the cost of both local and Amazon EC2 service.
Cost per mosaic of a locally hosted image mosaic serviceCost per mosaic of a mosaic service hosted in the Amazon EC2 cloudItem
Cost ($)
12 TB RAID 5 disk farm and enclosure
(3 yr support)12,000
Dell 2650 Xeon quad-core processor,
1 TB staging area5,000
Power, cooling and administration
6,000
Total 3-year Cost
23,000
Cost per mosaic
0.64
Item
Cost ($)
Network Transfer In
1000
Data Storage on Elastic Block Storage
36,000
Processor Cost (cl.medium)
4,500
I/O operations
7,000
Network Transfer Out
4,200
Total 3-year Cost
52,700
Cost per mosaic
1.46
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Part II - Application to calculation of periodograms
Generation of a science product: an atlas of periodograms for the 210,000 light curves released by the NASA Kepler Mission.
Summary of periodogram calculations on the Amazon EC2 cloud
|
| Result |
|---|---|---|
Runtimes | Tasks | 631,992 |
| Mean Task Runtime | 6.34 sec |
| Jobs | 25,401 |
| Mean Job Runtime | 2.62 min |
| Total CPU Time | 1,113 hr |
| Total Wall Time | 26.8 hr |
Inputs | Input Files | 210,664 |
| Mean Input Size | 0.084 MB |
| Total Input Size | 17.3 GB |
Outputs | Output Files | 1,263,984 |
| Mean Output Size | 0.124 MB |
| Total Output Size | 76.52 GB |
Cost | Compute Cost | $291.58 |
| Transfer Cost | $11.48 |
| Total Cost | $303.06 |
References
- Berriman, G.B. et al. Sixth IEEE International Conference on e-Science, 1-7 (2010)
- Berriman, G.B. et al. SPIE Conference 7740: Software and Cyberinfrastructure for Astronomy (2010)
- Juve, G. et al. Cloud Computing Workshop in Conjunction with e-Science Oxford, UK: IEEE (2009)
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