High Performance Computing: A Review of Parallel Computing with ANSYS solutions. Efficient and Smart Solutions for Large Models

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1 High Performance Computing: A Review of Parallel Computing with ANSYS solutions Efficient and Smart Solutions for Large Models 1

2 Use ANSYS HPC solutions to perform efficient design variations of large structural models 2

3 Everyone can take advantage of HPC solutions for faster computation and variations of large models 3

4 All users can benefit from HPC computations 4

5 Most of the analysis types can be accelerated Static linear or nonlinear analyses Buckling analyses Modal analyses Harmonic & Transient response analyses using the FULL method Low-frequency electromagnetic analysis High-frequency electromagnetic analysis Coupled-field analyses Superelements (use pass) Cyclic symmetry analyses 5

6 Speed Up Size of the model how large is large? elements 8000 elements elements elements Number of CPUs 6

7 A simple and productive licensing scheme ANSYS HPC Pack ANSYS HPC Workgroup 7

8 Which part of the simulation is faster? 8

9 Not all steps of the simulation are parallel Model solution 9

10 How should I read speed-up curves? This is the solver part excellent scaling! This is YOUR time (elapsed) 10

11 The right combination of algorithms and hardware leads to maximum efficiency 11

12 Shared Memory Parallel vs Distributed Memory Parallel 12

13 Challenges and solutions for the distributed method Challenges Efficient and relevant decomposition Load Balancing Speed Maximum Problem Size I/O to communicate between cores. I/O to write results and overflow files during solution. Solutions Partitioning methods, Solver Partitioning methods, Solver Hardware(Processors, Interconnects), Solver Hardware (RAM), Solver Hardware (Interconnects), MPI, Solver Hardware (Disks, Interconnects), MPI, Solver 13

14 Sparse or iterative solvers? Solver type SPARSE (direct) Distributed/Shared Memory DMP/SMP PCG (Iterative) LANB (direct, modal) LANPCG (iterative, modal) SNODE DMP/SMP SMP DMP/SMP SMP 14

15 Get it in-core! Optimal - 24GB Incore - 24GB Minimum - 4GB Optimal -4GB Minimum - 24GB Time (s) 15

16 Check the PCG level! 16

17 Balancing the load: a key to efficiency 17

18 A consequence for contact users 18

19 Remote Load or Displacements All nodes connected to one RBE3 node have to be grouped into the same domain. This hurts load balance! Try to reduce # of RBE3 nodes. Point moment and it is distributed to internal surface of the hole Deformed shape 19

20 The choice of hardware will condition the performance of the solution 20

21 Interconnects to ensure data traffic 6000 TrueScale vs GigE (16 Nodes) In Core Memory Wall Time (secs) TrueScale Gig-E Cores 3 Millions DOF using direct sparse solver Solid 95 elements, worst case for a direct solver 21

22 Disks to efficiently handle I/O 22

23 Approximate size of models wrt configuration RAM (GB) PCG Sparse PC1 (standard ) ~ 16 ~15 ~1 PC2 ( Hautes Performances) ~96 ~100 ~10 (Size of models in million dof) PC1 high end ( 64 bit, 12 GB <= RAM <= 24 GB, 2 disques RAID 0 ( Desktop or Laptop ) PC2 ultra high end (64 bit,96 GB, 4 disques RAID 0 ) 23

24 Taking advantage of new hardware solutions: GPU 24

25 Speed-up from GPU technology Linux cluster : Each node contains 12 Intel Xeon series cores, 96 GB RAM, NVIDIA Tesla M2070, InfiniBand Solder balls Results Courtesy of MicroConsult Engineering, GmbH Solder Joint Benchmark - 4M DOF, Creep Strain Analysis Mold PCB 25

26 Speed-up from multiple nodes with 1 GPU board per node Solder balls 1 8 cores no GPU 1 8 cores, 1 GPU 2 nodes@ 4 cores, 2 GPU 8 nodes@ 1 core, 8 GPU Results Courtesy of MicroConsult Engineering, GmbH Mold PCB 26

27 Reduce computation times from hours to minutes, from days to hours some examples 27

28 Core Solver Speedup Typical benchmark results 5000 ANSYS Mechanical M DOF Distributed ANSYS Sparse Solver AMD Opteron 2360 ("Barcelona") QLogic TrueScale Infiniband ANSYS Mechanical M DOF Distributed ANSYS PCG Solver Intel Xeon 5500 Processor Series ("Nehalem") Number of Cores 28

29 What could it look like on your model? 1 HPC Pack 6 Mio Degrees of Freedom Plasticity, Contact Bolt pretension 4 load steps 29

30 BGA Model 30

31 BGA Model Mesh pictures 31

32 BGA Model Deformations and stresses 32

33 BGA Model comparing solvers PCG lev 1 Sparse Elapsed solve 425 sec 4512 sec solver Mflops Elapsed tot 580 sec 4717 sec 33

34 BGA Model comparing hardware configurations (PCG solver) Laptop 2 X9100 cores 3.06 Ghz Desktop 8 W5580 cores 3.20 Ghz Elapsed PCG 1394 sec 425 sec PCG solver Mflops Elapsed tot 1753 sec 580 sec 34

35 BGA Model elapsed time vs model size Elapsed solve ( sec) Elapsed solve Million DOF 35

36 Use ANSYS HPC solutions to perform efficient design variations of large structural models 36

37 Q & A 37

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