Grid Resources for Industrial Applications Structural engineering applications

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Grid Resources for Industrial ApplicationsStructu
ral engineering applications

• Antonella FRIGERIO, CESI S.p.A. - ITALY
• LCSC 5th Annual Workshop on Linux Clusters for
  Super Computing
• Linköping - Sweden
• 18-19th October 2004

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CESI

• CESI is a company operating in the
  electro-energetic and environmental sectors in
  more than 35 Countries all over the world

www.cesi.it

• in the last few years CESI has acquired new
  skills concerning civil engineering services in
• the safety of dams, valleys and water basins
• diagnosis of the deterioration of existing
  structures
• studies of interventions aimed at mitigating the
  seismic risk for the electrical system

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Civil engineering applications

• CESI in-house codes are based on the Finite
  Element Method and they could perform
• real and complex modal analyses
• linear and non-linear dynamic analyses
• seismic analyses
• structural identification dynamic analyses
• All these structural analyses imply
• massive processing requirements
• persistent data storage needs

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CESI applications

• INDIA
• this code performs structural dynamic analyses,
  taking into account possible fluid structure
  interaction

Numerical model of a tower
Modal shapes
computed by INDIA
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CESI applications

• AIDA
• this code performs structural identification
  analyses the aim of an identification process is
  to meet reality with a numerical model

material parameters of the numerical model are
iteratively modified by an identification
process, so that numerical results fit the
experimental ones
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CESI applications

• GameB and Postab
• these codes are the pre and post processors of
  CESI in-house codes they generates respectively
  the input model file of the structure and the
  model output file which visualised the analyses
  results computed by our codes

Numerical model of a dam
A modal shape of a dam
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GRIA general sequence
INPUT FILES
APPLICATION
OUTPUT FILES

• ltcase namegt.gaminp
• ltgeneral namegt.UNV / NEU

ltcase namegt.gamout ltcase namegt.game
GameB
ltcase namegt. indinp / aidinp ltcase namegt.
game ltgeneral namegt.UNV / NEU
ltcase namegt. indout ltcase namegt. aidout ltcase
namegt. modi
INDIA and/or AIDA
ltcase namegt.postinp ltcase namegt.modi
ltcase namegt.postout ltmodal shapesgt.UNV / NEU
Postab
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Scenario

• Within the GRIA Project, CESI has a double target
• to provide consultancy for its clients
• in this case CESI will act as a service provider
• CESI will allow accessibility to in-house
  applications to third parties
• CESI will provide GRID-based technical consulting
  services for a fee, if necessary
• to outsource computation at critical times
• in this case CESI will act as a client
• CESI will satisfy any need of extra computing
  power by booking CPU to run analyses on the fly
  or reserving CPU for future use

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GRIA Testbed Infrastructure

• GRIA Testbed Infrastructure allows users to run
  batch processing applications on remote systems
• Two interfaces are provided to the system
• the command-line client
• it can be used to access GRID services by
  entering commands at a DOS or UNIX command prompt
• it allows to script easily sequences of
  operations
• the Java interface
• the Java library provides a more flexible
  interface, which makes it easier to use GRIA
  services from within your own programs

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Setting up a keystore

• GRIA system could be used only by user who are
  holder of certificates
• set up a keystore containing a key with your
  details
• get this key signed by a certification authority
  who is trusted by the service providers you wish
  to use
• import the signature into your keystore

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Setting up an account

• Any companys budget holder must set up accounts
  with one or more service providers
• he/she will grant certain other users access to
  the account
• he/she will be responsible for paying the usage
  of the account
• You should contact your budget holder to get
  permission to use existing companys accounts

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Available actions

• GRIA client can be used as follows
• calculate your processing, networking and storage
  requirements
• send these requirements to each supplier with
  which you have an account
• select and confirm one of the offers that are
  returned to you
• upload any input data
• run the job(s) or sequences of jobs
• download the results

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GRIA command line

• GRIA general command line is as follows
• gria_client ltcommandgt ltargumentsgt
• You can get more help on any command as follows
• gria_client ltcommandgt --help

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Creating a new account ...

• Run the command
• gria_client open Accounts.xml
• a dialog box appears prompting you to enter
  details about you and the service provider
• a request is sent to the supplier, asking for the
  account to be opened
• the supplier makes credit checks and, if
  everything is ok, a new account is opened and two
  files will be created
• the Accounts.xml file
• the client.state file (its an XML file listing
  all your Accounts)

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creating a new account

• the companys budget holder should send each user
  a copy of the Accounts.xml file to allow them to
  run job(s) on the GRIA system
• a companys budget holder can open accounts with
  several suppliers
• each new account is appended to the existing
  Accounts.xml file

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Getting a resource allocation ...

• To use remote GRID resources, you need to request
  a resource allocation from a service provider
• You should start with two files
• the Accounts.xml file
• the Requirements.xml file
• it gives the processing, networking and storage
  requirements of your job(s)

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getting a resource allocation

• run the command
• gria_client tender Account.xml Requirements.xml
  MyTask
• MyTask is a description for the new resource
  allocation
• all the suppliers listed in the Accounts.xml file
  will be contacted and asked to tender for your
  job(s)
• you will be prompted to choose one of the
  suppliers who sent you an offer
• at this point your account is billed for the
  resources you requested

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Uploading the input data

• You need to create a new data stager within your
  new resource allocation and upload input data of
  your job(s)
• You may place all the input data files in a ingle
  zip file the system will automatically unzip
  this file
• Run the command
• gria_client upload MyTask gaminp.zip
• gria_client upload MyTask neu.zip

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Running job

• In order to run a job you need
• a resource allocation conversation with your
  uploaded input data
• the Work.xml file
• It is a file describing the processing
  requirements of your job
• the allocation must support the application you
  want to execute
• Run the command
• gria_client run MyTask http//gria.org/gameb
  WorkGameB.xml --input gaminp.zip --input neu.zip
  --output gamout.zip --output game.zip
• The system starts submitting the job, checking
  constantly the status until the job will finish

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Downloading the output data

• When the job is finished, you may download the
  output data files you specified in the run
  command
• Run the command
• gria_client download MyTask gamout.zip
• gria_client download MyTask game.zip
• A browse interface is available to see the
  details of your account using the command
• gria_client browse

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Removing the allocation

• When a job finishes running, the remote resource
  allocation can be remove using the command
• gria_client finish
• If you didnt use all the resources you
  originally requested, youll be reimbursed for
  some fraction of their cost

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GRIA project evaluation

• CESI is confident the GRIA system will gain
  importance in the next years
• Its easy to add applications on GRIA system
• Its easy to run analyses and get job results
• Security aspects are taken into account
• The business model could satisfy different needs