Erick Butler Poletto (Matricola: 720403)Ricardo Alexandre Fiorelli (Matricola: 719874)

Prof.ssa Chiara Francalanci

July 21th, 2009

Introduction Research Objectives Methodology Analysis and Conclusions Further Work

What is Green Computing? Green ICT Phases

◦ Assessment and Action Plan Green ICT Benefits:

◦ Reduction of costs ◦ Reduction of power consumption◦ Reduction of data center used area◦ Marketing strategy

Reduce the burden of ICT on the environment

Green of ICT Green by ICTReduce the burden

on the environment by

improving efficiency through

the use of ICT•Data Center Centralization•Hosting

•Communication•Remote Data Access

Machine Configuration Policies / Tools / Labels Thin Client Architectures Virtualization in servers Data Storage Power Architectures Cooling

Introduction Research Objectives Methodology Analysis and Conclusions Further Work

Objectives Benefits

Creation of a Database of components

Evaluate power consumption data of a benchmarking tool (SANDRA)

Identification of critical power consumption spots in a datacenter

Easy choice of power-efficient machine configurations

Introduction Research Objectives Methodology Analysis and Conclusions Further Work

For Database of Components:◦ SiSoftware Sandra◦ WebSPHINX (web crawler)

For Data Validation:◦ Energy Measurement Device

Benchmark for several typologies of components

Database of components that permits comparisons between them

Provides information about components power, performance and price

Main source of gathered data Sandra database – no centralized

component repository Each benchmark has its own list of

components Solution:

◦ Introduction of the MPN code

Set of categories and relations:◦ Classification Relations◦ Characteristic Relations◦ Benchmark Relations◦ Price Relation

Provides a way to compare and evaluate the data center components

Validate the measures from Sandra

Introduction Research Objectives Methodology Analysis and Conclusions Further Work

Comparison between: ◦ Sandra estimated processor power ◦ Nominal processor power (specification)

Sandra measured power > nominal power for 30% of the components

Idle and stressed processor

Why Sandra is not reliable?◦ Sandra power estimates can be are higher than

nominal power◦ Its measures differ by a large margin from the

ones made with the measuring tool

Possible reasons for observed Sandra innacuracies:◦ Not centralized component database

Sandra may associate the benchmarked component to a different one in its database

◦ Power information can be erroneous◦ Power information is not associated with the

machine workload Does it refer to idle or stressed component?

Measurement error sources:◦ Power hypotheses:

Hard Drives and Wireless << Processor, Memory or PSU

◦ Oscillations in measurement◦ Use of PSU and monitor power estimates

Although the measurements were not completely accurate themselves, Sandra was regarded as non reliable◦ Sum of hard disk and wireless card powers usually

is around 2,5W◦ For a certain operation level, the measured power

did not oscillate much◦ In some cases, Sandra provided a processor power

estimate incoherent with their nominal power◦ The error commited in the estimates of the PSU

and monitor power do not explain the observed deviations

The database of components is a very effective tool

With relation to power consumption, Sandra is not the best source of data

Other sources of power-related data should be considered

Introduction Research Objectives Methodology Analysis and Conclusions Further Work

Automated update of the database. A back-end robot would crawl the web for new components and their specifications/prices

Use of a new source of power-related data

a GUI front-end software for an interactive and effective way of comparing the components

Erick Butler PolettoRicardo Alexandre Fiorelli