xiv Contents
7.2 Alternative/Related Technologies .......................................................................... 364
7.2.1 Using GPUmat ..............................................................................................364
7.2.2 Multicore Library for Parallel Processing on Multiple Cores ................368
7.2.3 Using ArrayFire Library via MEX Interface ............................................370
7.2.4 Additional Alternatives ..............................................................................373
7.3 Multithreading .......................................................................................................... 374
7.3.1 Using POSIX Threads .................................................................................. 374
7.3.2 Using OpenMP .............................................................................................377
7.3.3 Using Java Threads ......................................................................................379
7.3.4 Using .Net Threads ......................................................................................382
7.3.5 Using MATLAB Timers ..............................................................................384
7.4 Spawning External Processes..................................................................................385
8 Using Compiled Code ........................................................................................................389
8.1 Using MEX Code .......................................................................................................389
8.1.1 Introduction ..................................................................................................389
8.1.2 Our First MEX Function .............................................................................390
8.1.3 MEX Function Inputs and Outputs ........................................................... 394
8.1.4 Accessing MATLAB Data ........................................................................... 395
8.1.5 A Usage Example ......................................................................................... 401
8.1.6 Memory Management .................................................................................404
8.1.7 Additional Aspects ...................................................................................... 406
8.2 Using the MATLAB Coder Toolbox ....................................................................... 413
8.2.1 Code Adaptation .......................................................................................... 414
8.2.2 A Simple Example: Euclidean Distances Algorithm .............................. 416
8.2.3 A More Realistic Example: Dijkstra’s Shortest-Path Algorithm ............ 420
8.2.4 Conguring the Coder for Maximal Performance .................................427
8.3 Porting MATLAB Algorithms to FPGA.................................................................433
8.3.1 Algorithm Adaptation .................................................................................434
8.3.2 HDL Workow .............................................................................................435
8.3.3 Run-Time Measurements ............................................................................ 444
8.4 Deployed (Compiled) MATLAB Programs ...........................................................445
8.5 Using External Libraries ..........................................................................................450
8.5.1 Introduction .................................................................................................. 450
8.5.2 Java ................................................................................................................. 451
8.5.3 NAG: Numerical Algorithms Group.........................................................452
8.5.4 MATLAB Toolbox ........................................................................................455
8.5.5 MCT: Multi-Precision Computing Toolbox ..............................................456
8.5.6 Additional Libraries ....................................................................................457
9 Memory-Related Techniques ...........................................................................................459
9.1 Why Memory Affects Performance ........................................................................459
9.2 Proling Memory Usage .......................................................................................... 461
9.2.1 Workspace Browser ..................................................................................... 461
9.2.2 whos Function .............................................................................................. 462
9.2.3 memory Function ........................................................................................463
9.2.4 feature memstats and feature dumpmem ...............................................464
9.2.5 feature mtic/mtoc ........................................................................................466
9.2.6 Proler’s Memory-Monitoring Feature .....................................................467
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