155">Program title: iEBE-VISHNU
160">Catalogue identifier: AEYA_v1_0
165">Program summary URL:10" class="interref" data-locatorType="url" data-locatorKey="http://cpc.cs.qub.ac.uk/summaries/AEYA_v1_0.html">http://cpc.cs.qub.ac.uk/summaries/AEYA_v1_0.html
170">Program obtainable from: CPC Program Library, Queen’s University, Belfast, N. Ireland
175">Licensing provisions: Standard CPC licence, 15" class="interref" data-locatorType="url" data-locatorKey="http://cpc.cs.qub.ac.uk/licence/licence.html">http://cpc.cs.qub.ac.uk/licence/licence.html
180">No. of lines in distributed program, including test data, etc.: 5257939
185">No. of bytes in distributed program, including test data, etc.: 262822421
190">Distribution format: tar.gz
195">Programming language: Fortran, C++, python, bash, SQLite.
Computer: Laptop, desktop, cluster.
Operating system: Tested on GNU/Linux Ubuntu 12.04 x64, Red Hat Linux 6, Mac OS X 10.8+.
10">RAM: 2G bytes
15">Classification: 17.11, 17.16, 17.20.
External routines: GNU Scientific Library (GSL), HDF5 (Fortran and C++ enabled), Numpy
Nature of problem: Relativistic heavy-ion collisions are tiny in size (mmlsi153" class="mathmlsrc">method=retrieve&_eid=1-s2.0-S0010465515003392&_mathId=si153.gif&_user=111111111&_pii=S0010465515003392&_rdoc=1&_issn=00104655&md5=25fbbc981b7bb6927eab525fa8db2532">14" width="95" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0010465515003392-si153.gif">) and live in a flash (mmlsi154" class="mathmlsrc">method=retrieve&_eid=1-s2.0-S0010465515003392&_mathId=si154.gif&_user=111111111&_pii=S0010465515003392&_rdoc=1&_issn=00104655&md5=372d3aa25491b094c620109dd3377fa1">14" width="91" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0010465515003392-si154.gif">). It is impossible to use external probes to study the properties of the quark-gluon plasma (QGP), a novel state of matter created during the collisions. Experiments can only measure the momentum information of stable hadrons, who are the remnants of the collisions. In order to extract the thermal and transport properties of the QGP one needs to rely on Monte-Carlo event-by-event model simulations, which reverse-engineer the experimental measurements to the early time dynamics of the relativistic heavy-ion collisions.
Solution method: Relativistic heavy-ion collisions contain multiple stages of evolution. The physics that governs each stage is implemented into individual code components. A general driver script glues all the modular packages as a whole to perform large-scale Monte-Carlo simulations. The final results are stored into SQLite database, which supports standard querying for massive data analysis. By tuning transport coefficients of the QGP as free parameters, e.g. the specific shear viscosity mmlsi45" class="mathmlsrc">method=retrieve&_eid=1-s2.0-S0010465515003392&_mathId=si45.gif&_user=111111111&_pii=S0010465515003392&_rdoc=1&_issn=00104655&md5=ff72b3a4687df7cc0e295721eafab6f5" title="Click to view the MathML source">η/s, we can constrain various transport properties of the QGP through model-data comparisons.
Additional comments: !!!!! The distribution file for this program is over 260 Mbytes and therefore is not delivered directly when download or Email is requested. Instead a html file giving details of how the program can be obtained is sent. !!!!!
Running time: The following running time is tested on a laptop computer with a 2.4 GHz Intel Core i5 CPU, 4 GB memory. All the C++ and Fortran codes are compiled with the GNU Compiler Collection (GCC) 4.9.2 and -O3 optimization ( Table 1).