INDIANA UNIVERSITY
 
 
 
 
 

UITS Research Technologies High Performance Systems Newsletter

 
 
January 29, 2019
General System Information / Education
General Information
Supercomputing for Everyone image

Upcoming Maintenance Days:
Emergency downtimes: See IT Notices: http://itnotices.iu.edu

  • Big Red ll, Big Red II+, Carbonate, Karst, DC2/DCWAN:
    • February 10, 7am-7pm
    • March 10, 7am-7pm
  • Research Database Complex (RDC)
    • February 5, 7am-7pm
    • March 5, 7am-7pm
  • Scholarly Data Archive and Geode:
    • February 10, 7-10am
    • March 10, 7-10am

Upcoming Training and Education
The following courses are offered as part of the Supercomputing for Everyone Series (S4ES) taught by UITS Research Technologies personnel:

  • Unix: The Basics
  • Intro to High Performance Computing (HPC)
  • Storage for HPC at IU
  • Statistical & Numerical Software for HPC at IU
  • Intro to R for Biologists
  • Introductory Parallel Computing for Supercomputers
  • Intermediate Parallel Computing for Supercomputers
  • Getting Started with IU REDCap
  • Surveys in IU REDCap
  • De novo assembly of transcriptomes using HPC resources
    • April 30 - May 1 at IUB - register here
System specific information
Big Red II+
Image of Big Red 2 plus

User environment changes:

  • At the December maintenance, RPM updates were installed and Big Red II+ was rebooted.

Software added:

  • Portland Group (PGI) compilers
    • Version: 18.5
    • Brief description: Full featured Fortran, C and C++ compilers.
    • Module name: pgi/18.5
  • Oracle Client
    • Version: 12.2.0
    • Brief description: An oracle database client package.
    • Module name: oracle-client/12.2.0.1

Software retired:

  • None since last newsletter

Modules retired:

  • None since last newsletter
------------------------------------------------------------------------
Big Red II
Image of Big Red

User environment changes:

  • No changes since last newsletter.

Software added:

  • Portland Group (PGI) compilers
    • Version: 18.5
    • Brief description: Full featured Fortran, C and C++ compilers.
    • Module name: pgi/18.5
  • Oracle Client
    • Version: 12.2.0
    • Brief description: An oracle database client package.
    • Module name: oracle-client/12.2.0.1

Software retired:

  • None since last newsletter

Modules retired:

  • None since last newsletter
------------------------------------------------------------------------
Karst
Image of Big Red

User environment changes:

  • No changes since last newsletter.

Software added:

  • Portland Group (PGI) compilers
    • Version: 18.5
    • Brief description: Full featured Fortran, C and C++ compilers.
    • Module name: pgi/18.5
  • Oracle Client
    • Version: 12.2.0
    • Brief description: An oracle database client package.
    • Module name: oracle-client/12.2.0.1

Software retired:

  • None since last newsletter

Modules retired:

  • None since last newsletter
------------------------------------------------------------------------
Carbonate
Image of Big Red

User environment changes:

  • No changes since last newsletter.

Software added:

  • Portland Group (PGI) compilers
    • Version: 18.5
    • Brief description: Full featured Fortran, C and C++ compilers.
    • Module name: pgi/18.5
  • Oracle Client
    • Version: 12.2.0
    • Brief description: An oracle database client package.
    • Module name: oracle-client/12.2.0.1

Software retired:

  • None since last newsletter

Modules retired:

  • None since last newsletter
------------------------------------------------------------------------
Research Desktop (RED)
Image of Big Red

User environment changes:

  • No changes since last newsletter.

Software added:

  • Portland Group (PGI) compilers
    • Version: 18.5
    • Brief description: Full featured Fortran, C and C++ compilers.
    • Module name: pgi/18.5
  • Oracle Client
    • Version: 12.2.0
    • Brief description: An oracle database client package.
    • Module name: oracle-client/12.2.0.1

Software retired:

  • None since last newsletter

Modules retired:

  • None since last newsletter
Tip of the Month

When numbers are calculated in a floating point math operation, the system has many more digits in its buffer than can be justified by the precision of the inputs. The question becomes how many digits in the solution can be believed and which ones only contribute to the error? In this exercise, a million random real numbers were created and printed out in a text file. The computer was then asked to simply read the file and add them up. It summed from position one to a million and compared it to its sum from position one million to one.

For the default, 32-bit precision, the results were:
forward sum is = 0.4852211057E+12
reverse sum is = 0.4852207124E+12
First discrepancy is in the 6'th digit.

For 64-bit (double) precision:
forward sum is = 485220744826.172424
reverse sum is = 485220744826.173584
First discrepancy is in the 15'th digit

Finally, for 128-bit (quad) precision:
forward sum is = 485220744826.18382927712407234600134
reverse sum is = 485220744826.18382927712407234630628
First discrepancy is in the 31'st digit.

Of course, greater precision is not free. Appropriate precisions should be determined by need.
Events Calendar

View more conferences, events, and learning opportunities »
Administrivia

Systems Administration
Maintenance windows:

  • Big Red ll, Big Red II+, Carbonate, Karst, DC2/DCWAN, Geode:
    Second Sunday each month, 7am-7pm EDT
  • RDC: First Tuesday each month, 7am-7pm EDT
  • Scholarly Data Archive: Sundays, 7-10am EDT
  • Geode: Sundays, 7-10am EDT
  • Emergency downtimes: See IT Notices: http://itnotices.iu.edu

How to contact us and get help
Do you have questions about IU's cyberinfrastructure or need help? Try these resources:

More ways to get PTI and UITS-RT news:
Web: http://itnews.iu.edu
Facebook: http://facebook.com/iu.uits
Twitter: http://twitter.com/insideuits
YouTube: http://www.youtube.com/user/IUPTI


This is an official publication of Indiana University and is produced by University Information Technology Services, Indiana University.

Research Technologies
is a division of
University Information Technology Services
and a center in the
Indiana University Pervasive Technology Institute.

Copyright 2019, The Trustees of Indiana University.

Please credit UITS when referring to
or using information in this publication.

 
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