Ongoing Computer Engineering Research Projects at the Lucian

Report
Ongoing Computer Engineering
Research Projects at the Lucian
Blaga University of Sibiu
Prof. Lucian VINTAN, PhD-Director
Advanced Computer Architecture &
Processing Systems Research Lab http://acaps.ulbsibiu.ro/research.php
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
The Research Team
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Prof. Lucian VINTAN, PhD – Research Chair
Assoc. Prof. Adrian FLOREA, PhD
Senior Lecturer Daniel MORARIU, PhD
Senior Lecturer Ion MIRONESCU, PhD
Lecturer Arpad GELLERT, PhD
Radu CRETULESCU, PhD student
Horia CALBOREAN, PhD student
Ciprian RADU, PhD student
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Computing hardware
14 Intel Compute nodes (2 processor HS21 blades with quad-core Intel Xeon)
2 Cell Compute nodes (2 processor QS22 blades withIBM PowerXCell 8i Processor )
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Our current research topics
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Anticipatory Techniques in Advanced
Processor Architectures
An Automatic Design Space Exploration
Framework for Multicore Architecture
Optimizations
Optimizing Application Mapping Algorithms
for NoCs through a Unified Framework
Optimal Computer Architecture for CFD
calculation
Adaptive Meta-classifiers for Text Documents
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Anticipatory Techniques in
Advanced Processor
Architectures
Prof. Lucian VINTAN, PhD
Assoc. Prof. Adrian FLOREA, PhD
Lecturer Arpad GELLERT, PhD
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Fetch Bottleneck
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Fetch Rate is limited by the basic-blocks’ dimension (7-8 instructions in SPEC
2000);
Solutions
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Trace-Cache & Multiple (M-1) Branch Predictors;
Branch Prediction increases ILP by predicting branch directions and targets and
speculatively processing multiple basic-blocks in parallel;
As instruction issue width and the pipeline depth are getting higher, accurate
branch prediction becomes more essential.
Some Challenges
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Identifying and solving some Difficult-to-Predict Branches (unbiased branches);
Helping the computer architect to better understand branches’ predictability and
also if the predictor should be improved related to Difficult-to-Predict Branches.
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Difficult to predict unbiased branches
A difficult-to-predict branch in a certain dynamic context
 unbiased
 „highly shuffled“.
Unbiased Context Instances
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GH (p bits)
50%
GH (p bits) + PATH (p PCs)
45%
GH (p bits) + PBV
40%
35%
30%
25%
20%
15%
p=1
p=4
p=8
p=12 p=16 p=20 p=24
Conte xt Le ngth
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Predicting Unbiased Branches
State of the art branch predictors are unable to accurately
predict unbiased branches;
The problem:
 Finding new relevant information that could reduce their
entropy instead of developing new predictors;
Challenge:
 Adequately representing unbiased branches in the feature
space!
 Accurately Predicting Unbiased Branches is still an Open
Problem!

Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Random Degree Metrics
Based on:
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Hidden Markov Model (HMM) – a strong method to evaluate
the predictability of the sequences generated by unbiased
branches;
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Discrete entropy of the sequences generated by unbiased
branches;
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Compression rate (Gzip, Huffman) of the sequences generated by
unbiased branches.
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Issue Bottleneck (Data-flow)
Conventional processing models are limited in their processing speed by the dynamic program’s
critical path (Amdahl);
2 Solutions
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Dynamic Instruction Reuse (DIR) is a non-speculative technique.
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Value Prediction (VP) is a speculative technique.
Common issue
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Value locality
Chalenges
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Selective Instruction Reuse (MUL & DIV)
Selective Load Value Prediction (“Critical Loads”)
Exploiting Selective Instruction Reuse and Value Prediction in a Superscalar / Simultaneous
Multithreaded (SMT) Architecture to anticipate Long-Latency Instructions Results
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Exploiting Selective Instruction Reuse and Value
Prediction in a Superscalar Architecture
Selective Instruction Reuse (MUL & DIV)
Fetch
Decode
Issue
Commit
Execute
Lookup (PC, V1, V2)
RB
Result (if hit)
Selective Load Value Prediction (Critical Loads)
Misprediction Recovery
Fetch
Decode
Issue
If Load with miss
in L1 Data Cache
Execute
LVPT
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Commit
Predicted Value
Selective Instruction Reuse and Value Prediction in Simultaneous
Multithreaded Architectures
SMT Architecture (M-Sim) enhanced with per Thread
RB and LVPT Structures
Physical
Register
File
Branch
Predictor
PC
Fetch
Unit
I-Cache
Decode
Rename
Table
Issue
Queue
Functional
Units
ROB
LSQ
RB
D-Cache
LVPT
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Exploiting Selective Instruction Reuse and Value Prediction in a
Superscalar Architecture
The M-SIM Simulator
Power Models
Hardware
Configuration
Cycle-Level
Performance
Simulator
SPEC
Benchmark
Hardware Access Counts
Performance
Estimation
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IPC Speedup
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EDP 
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IPCimproved  IPCbase
IPCbase
 100%
Total Power
IPC 2
EDP Gain 
Power
Estimation
EDPbase  EDPimproved
EDP
 100%
base Systems Research Lab
Advanced Computer Architecture & Processing
http://acaps.ulbsibiu.ro/research.php
Exploiting Selective Instruction Reuse and Value Prediction in
a Superscalar Architecture
Relative IPC speedup and relative energy-delay product gain with a Reuse Buffer of
1024 entries, the Trivial Operation Detector, and the Load Value Predictor
40%
35%
30%
INT - IPC Speedup
25%
INT - EDP Gain
20%
FP - IPC Speedup
15%
FP - EDP Gain
10%
5%
0%
16
32
64
128 256
512 1024 2048
LVPT entries
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Conclusions and Further Work
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Indexing the SLVP table with the memory address
instead of the instruction address (PC);
Exploiting an N-value locality instead of 1-value locality;
Generating the thermal maps for the optimal superscalar
and SMT configurations (and, if necessary, developing a runtime thermal manager);
Understanding and exploiting instruction reuse and value
prediction benefits in a multicore architecture.
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Anticipatory multicore architectures
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Anticipatory multicores would significantly reduce the pressure on
the interconnection network performance/energy;
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Value prediction, multithreading and the cache
coherence/consistence mechanisms there are subtle, not wellunderstood relationships;
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data consistency errors  consistency violation detection and
recovery;
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The inconsistency cause: VP might execute out of order some
dependent instructions;
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Dynamic Instruction Reuse in a multicore system. Reuse Buffers
coherence problems cache coherence mechanisms
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Details at http://webspace.ulbsibiu.ro/lucian.vintan/html/#11
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
An Automatic Design Space
Exploration Framework for
Multicore Architecture
Optimizations
Horia CALBOREAN, PhD student
Prof. Lucian VINTAN, PhD
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Multiobjective optimization
Number of (heterogeneous) cores in the processor
becomes higher – the systems become more and
more complex
 More configurations have to be simulated
(NP-hard problem)
 Time needed to simulate all configurations
prohibitive
 Performance evaluation has become a
multiobjective evaluation

Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Solutions
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Reducing simulation time
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parallel & distributed simulation
sampling simulation
Reducing number of simulations
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intelligent multiobjective algorithms
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Proposed framework
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We developed FADSE (framework for automatic
design space exploration)
Compatible with most of the existing simulators
Portable - implemented in java
Includes many well known multiobjective
algorithms
Is able to run simulators and also well known test
problems
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Existing tools
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Bounded to a certain simulator (Magellan)
Lack portability - bounded to a certain operating
system (M3Explorer, Magellan)
Perform design space exploration of small parts of
the system (only the cache - Archexplorer)
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
FADSE – application architecture
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Features
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Parallel simulation (client server model)
Ability to introduce constrains through XML
interface
Easily configurable through XML files:
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change DSE algorithm,
specify input parameters and their possible values,
specify desired output metrics, etc.
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Our target
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Perform an evaluation of the existing algorithms on
different simulators
Find out which one performs best
Improve the algorithms - map them on the specific
problem of design space exploration
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Conclusions
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We have developed a framework which is able to
perform automatic design space exploration
Extensible, portable
Many implemented multiobjective algorithms
(through the use of jMetal)
Reduces time through parallel &distributed
execution of simulators
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Optimizing Application Mapping
Algorithms for NoCs through a
Unified Framework
Ciprian RADU, PhD student
Prof. Lucian VINTAN, PhD
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Outline
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Introduction
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Evaluating application mapping algorithms for Networkson-Chip
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The application mapping problem for NoCs
The relation between application mapping and routing
The framework design
The ns-3 NoC simulator
Automatic Design Space Exploration for Networks-onChip
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The framework
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
The application mapping problem for
NoCs
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Application mapping & routing
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Evaluating application mapping algorithms
for Networks-on-Chip
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Existing application mapping algorithms are
currently evaluated on specific NoCs
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e.g.: NoCs with 2D mesh topology
Existing comparisons between the algorithms are
not made on the same NoC architecture
We propose a unified framework for the evaluation
and optimization of application mapping algorithms
on different NoC designs
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
The framework design
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3 major components:
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A module that contains the implementation of different
application mapping algorithms;
A network traffic generator;
A Network-on-Chip simulator.
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
The framework design flow
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
The ns-3 NoC simulator
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Based on ns-3, an event driven simulator for Internet
systems
Aims for a good accuracy – speed trade-off
Flexible and scalable
Current parameters:
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Packet size, packet injection rate, packet injection probability;
Buffer size;
Network size;
Switching mechanism (SAF, VCT, Wormhole);
Routing protocol (XY, YX, SLB, SO);
Network topology (2D mesh, Irvine mesh);
Traffic patterns (bit-complement, bit-reverse, matrix transpose,
uniform random).
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Automatic Design Space Exploration for
Networks-on-Chip
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Motivation
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There is no NoC suitable for all kinds of workload
There is an exponential number of possible NoC
architectures
Exhaustive DSE is no longer suitable
Automatic DSE uses an heuristic driven exploration
of the design space
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Disadvantage: near-optimal solutions
Advantage: speed
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
The framework
Design Space
Exploration module
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DSE module
NoC simulator
Simulation results
The DSE module determines the parameters of the NoC
architecture
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Network-on-Chip
simulator
Components:
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Configure
the simulator
Uses algorithms from Artificial Intelligence
The NoC simulator (ns-3 NoC) is automatically configured
to simulate the network architecture determined by the
DSE module
The simulation results (network performance) help the
DSE module at generating a better NoC architecture
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Optimal computer
architecture for CFD
calculation
Senior Lecturer Ion Dan MIRONESCU, PhD
Prof. Lucian VINTAN, PhD
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Practical aplication
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Modelling and simulation of multiscale, multicomponent,
multiphase flow in complex geometry (ongoing projects)
for :
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optimisation of sugar crystalisation
prediction of the flow properties of polymer based dispers systems
(starch and starch fractions, microbial polysacharides)
HPC/CFD
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Goals
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Speed-up of this application on the given
architecture
Finding the optimal manycore architecture for
CFD application (e.g. NoC)
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Method - Lattice Boltzmann
(Chirila,2010)
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Method advantages
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easy discretization of complex geometry
easy incorporation of “multi” models
easy paralelisation
easy cupling to other scale models (Molecular
Dynamics)
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Ghost data
Computational model
COMPUTE
COMPUTE
COMPUTE
EXCHANGE
COMPUTE
COMPUTE
COMPUTE
COMPUTE
COMPUTE
COMPUTE
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
General-purpose manycore platform
What can be used and what must be accounted for:
 ILP (super scalar, out of order, branch prediction)
 Task and Thread LP (multicore/multiprocessor)
 Mixed programming model (shared memory on
blade, message passing between blades)
 Cache system
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Special purpose many core platform
What can be used and what must be accounted for:
 SIMD
 Task and Thread LP (hardware multithreading,
multicore/multiprocessor)
 Message passing
 Local store model –full user control
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Charm++
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provides a high-level abstraction of a parallel
program
cooperating message-driven objects called chares
support for load balancing, fault tolerance,
automatic checkpointing
support for all architectures trough a specific low
level tier
NAMD MD implementd in charm++
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Charm++ LB implementation
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Charm++ LB implementation
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
DSE
Search optimal values for
 sites/bloc
 blocs (chares)/core, /thread, /blade
 communication patterns
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Adaptive Meta-classifiers for
Text Documents
Prof. Lucian VINTAN, PhD
Daniel MORARIU, PhD
Radu CRETULESCU, PhD student
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Introduction
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We investigated a way to create a new
adaptive meta-classifier for classifying text
documents in order to increase the
classification accuracy.
During the first processing phase (preclassification) the meta-classifier uses a nonadaptive selector.
In the second phase (classification) we use a
feed-forward neural network based on the
back-propagation learning method.
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
The architecture of the adaptive metaclassifier M-BP
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Classification accuracy
Influence of the neurons number from the
hidden layer
100
Classification
Accuracy
98
96
96 neurons
128 neurons
94
160 neurons
92
176 neurons
192 neurons
90
350 320 290 260 230 200 170 140 110 80
Averge error using the training set
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
50
Time necessary for reaching the given
total error
400
96 neurons
128 neurons
Error thresholds
350
300
250
160 neurons
176 neurons
200
192 neurons
150
100
50
0
0
10000
20000
30000
Time in seconds
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
40000
Conclusions
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This new adaptive meta-classifier uses 8 types of SVM
classifiers and one Naïve Bayes type classifier to
achieve the transposition of the input data from a largescale space into a much smaller size space.
The best results (99.74% in terms of classification
accuracy) were obtained using a neural network with 192
neurons in the hidden layer.
The meta-classifier managed to exceed the maximum
"theoretical" limit of 98.63% which could be reached by
an ideal non-adaptive meta-classifier that always chose
the correct prediction if at least one classifier provide it.
For Reuters2000 text documents we obtained
classification accuracy up to 99.74%.
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
Some Refererences – Computer Architectures
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L. VINTAN, A. GELLERT, A. FLOREA, M. OANCEA, C. EGAN – Understanding Prediction Limits
through Unbiased Branches, Eleventh Asia-Pacific Computer Systems Architecture Conference,
Shanghai 6-8th, September, 2006 - http://webspace.ulbsibiu.ro/lucian.vintan/html/LNCS.pdf
A. GELLERT, A. FLOREA, M. VINTAN, C. EGAN, L. VINTAN - Unbiased Branches: An Open
Problem, The Twelfth Asia-Pacific Computer Systems Architecture Conference (ACSAC 2007),
Seoul, Korea, August 23-25th, 2007 - http://webspace.ulbsibiu.ro/lucian.vintan/html/acsac2007.pdf
VINTAN L. N., FLOREA A., GELLERT A. – Random Degrees of Unbiased Branches, Proceedings
of The Romanian Academy, Series A: Mathematics, Physics, Technical Sciences, Information
Science, Volume 9, Number 3, pp. 259 - 268, Bucharest, 2008 http://www.academiaromana.ro/sectii2002/proceedings/doc2008-3/13-Vintan.pdf
A. GELLERT, A. FLOREA, L. VINTAN. - Exploiting Selective Instruction Reuse and Value
Prediction in a Superscalar Architecture, Journal of Systems Architecture, vol. 55, issues 3, pp.
188-195, ISSN 1383-7621, Elsevier, 2009 http://webspace.ulbsibiu.ro/lucian.vintan/html/jsa2009.pdf
GELLERT A., PALERMO G., ZACCARIA V., FLOREA A., VINTAN L., SILVANO C. - EnergyPerformance Design Space Exploration in SMT Architectures Exploiting Selective Load Value
Predictions, Design, Automation & Test in Europe International Conference (DATE 2010), March
8-12, 2010, Dresden, Germany - http://webspace.ulbsibiu.ro/lucian.vintan/html/Date_2010.pdf
CALBOREAN H., VINTAN L. - An Automatic Design Space Exploration Framework for Multicore
Architecture Optimizations, Proceedings of The 9-th IEEE RoEduNet International Conference,
ISBN , Sibiu, June 24-26, 2010 - http://roedu2010.ulbsibiu.ro/ (indexata IEEE Xplore Digital
Library)
RADU C., VINTAN L. - Optimizing Application Mapping Algorithms for NoCs through a Unified
Framework, Proceedings of The 9-th IEEE RoEduNet International Conference, ISBN , Sibiu,
June 24-26, 2010 - http://roedu2010.ulbsibiu.ro/ (indexata IEEE Xplore Digital Library)
L. N. VINTAN - Direcţii de cercetare în domeniul sistemelor multicore / Main Challenges in
Multicore Architecture Research, Revista Romana de Informatica si Automatica, ISSN: 12201758, ICI Bucuresti, vol. 19, nr. 3, 2009, v. http://www.ici.ro/RRIA/ria2009_3/index.html
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
References (1/2) - CFD Calculation
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J. Hu and R. Marculescu, “Energy-aware mapping for tile-based NoC architectures under
performance constraints,” in Proceedings of the 2003 Asia and South Pacific Design Automation
Conference. Kitakyushu, Japan: ACM, 2003, pp. 233–239.
R. Marculescu and J. Hu, “Energy- and performance-aware mapping for regular NoC architectures,”
IEEE Transactions on ComputerAided Design of Integrated Circuits and Systems, vol. 24, no. 4, pp.
551–562, 2005.
S. Murali and G. D. Micheli, “Bandwidth-Constrained mapping of cores onto NoC architectures,” in
Proceedings of the conference on Design, Automation and Test in Europe - Volume 2. IEEE
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K. Srinivasan and K. S. Chatha, “A technique for low energy mapping and routing in network-on-chip
architectures,” in Proceedings of the 2005 international symposium on Low power electronics and
design. San Diego, CA, USA: ACM, 2005, pp. 387–392.
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ACM, 2004, pp. 914–919.
C. Grecu, A. Ivanov, P. Pande, A. Jantsch, E. Salminen, U. Ogras, and R. Marculescu, “Towards open
Network-on-Chip benchmarks,” in Proceedings of the First International Symposium on Networks-onChip.IEEE Computer Society, 2007, p. 205.
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
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H. vom Lehn, K. Wehrle, and E. Weing¨artner, “A performance comparison of recent network
simulators,” 2009 IEEE International Conference on Communications, pp. 1–5, 2009.
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and system synthesis. Seoul, Korea: ACM, 2006, pp. 82–87.
E. Salmien, A. Kulmala, and T. D. Hamalainen, “Survey of network-on-chip
proposals,” White paper, © OCP-IP, Tampere University of Technology, March 2008.
[On-line]. Available: http://ocpip.biz/uploads/documents/OCPIP_Survey_of_NoC_Proposals_White_Paper_April_2008.pdf
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php
References - Meta-classifiers for Text
Documents
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CRETULESCU R., MORARIU D., VINTAN L. – Eurovision-like
weighted Non-Adaptive Meta-classifier for Text Documents,
Proceedings of the 8th RoEduNet IEEE International
Conference Networking in Education and Research, pp. 145150, ISBN 978-606-8085-15-9, Galati, December 2009 (indexata
ISI Web of Science - http://apps.isiknowledge.com/)
MORARIU D., CRETULESCU R., VINTAN L. – Improving a SVM
Meta-classifier for Text Documents by using Naïve Bayes,
International Journal of Computers, Communications &
Control (IJCCC), Agora University Editing House - CCC
Publications, ISSN 1841 – 9836, E-ISSN 1841-9844, Vol. V, No.
3, pp. 351-361, 2010
CRETULESCU R., MORARIU D., VINTAN L., COMAN I. D. – An
Adaptive Meta-classifier for Text Documents, The 16th
International Conference on Information Systems Analysis
and Synthesis: ISAS 2010, Orlando Florida, USA, April 6th –
9th 2010
Advanced Computer Architecture & Processing Systems Research Lab
http://acaps.ulbsibiu.ro/research.php

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