1. GVis: Grid-enabled Interactive Visualization State Key Laboratory. of CAD&CG Zhejiang University, Hangzhou 2005-12-06

2. Background (1) Scientific Visualization Widely utilized in many fields. Widely utilized in many fields. Resource demanding (CPU, Memory, Graphic). Resource demanding (CPU, Memory, Graphic). Real-time User Interactive. Real-time User Interactive. Materials Earth physicsMedicine ……

3. Background (2) Grid Computing Integrating tremendous distributed resource on Internet. Integrating tremendous distributed resource on Internet. Providing nontrivial services to end-users. Providing nontrivial services to end-users. Conventional Grid System Most dedicated to batch tasks with little user interaction. Most dedicated to batch tasks with little user interaction. Non-practical real time requirement. Non-practical real time requirement.

4. Main problems Grid resources management Heterogeneous Heterogeneous Distributed Distributed Dynamic Dynamic Throughput and Latency Large data transporting over network Large data transporting over network Rendering and Compositing Rendering and Compositing

5. Our work GVis: Grid-enabled interactive visualization system Large scale resource utilizing. Large scale resource utilizing. Remote, parallel interactive visualization. Remote, parallel interactive visualization. Multi-task visualization. Multi-task visualization. All Java based, Cross-platform. All Java based, Cross-platform.

6. GVis Overview

7. GVis Architecture (1) GVis (GVRE, GVVF, GVis Portal) Grid middleware (Globus Toolkits 3.0) JRE, OS (Windows 2000/XP, Linux)

8. GVis Architecture (2) GVRE Grid infrastructure for visualization application. Grid infrastructure for visualization application. Based on Globus Tookits 3.0. Based on Globus Tookits 3.0.GVVF Framework for local, remote, parallel interactive visualization. Framework for local, remote, parallel interactive visualization. Loosely coupling with GVRE. Loosely coupling with GVRE. GVis Portal Interface between GVis user and GVis system. Interface between GVis user and GVis system. Easy remote access to GVis system. Easy remote access to GVis system.

9. GVRE - GVis Runtime Environment Information Management Resource nodes information. Resource nodes information. Visualization tasks information. Visualization tasks information. Implemented with OpenLDAP. Implemented with OpenLDAP. Resource Management Updating resource node information. Updating resource node information. Schedule and dispose request for resource usage. Schedule and dispose request for resource usage. Implemented as Grid Service. Implemented as Grid Service. Visualization Task Management Task description. (XML file) Task description. (XML file) Task distribution, monitoring and migration. Task distribution, monitoring and migration. Updating visualization task information. Updating visualization task information. Implemented as Grid Service. Implemented as Grid Service.

10. GVVF - GVis Visualization Framework (1) Components of GVVF Visualization task scheduler – task partition. Visualization task scheduler – task partition. Renderer – rendering. Renderer – rendering. Compositor – compositing partial results. Compositor – compositing partial results. Data server – dynamic data loading. Data server – dynamic data loading. Presenter – user interaction with visualization result. Presenter – user interaction with visualization result.

11. GVis Visualization Framework (GVVF) (2) Volume data visualization Hardware based texture rendering. Hardware based texture rendering. 2D texture – faster, lower quality, more memory. 3D texture – slower, higher quality, less memory. Java OpenGL Binding (JOGL). Java OpenGL Binding (JOGL). Convenient programming API. Acceptable efficiency. Partition and composition Image space based partition. Image space based partition. Need whole data copy, not suitable for large dataset. Object space based partition. Object space based partition. Need part of data, support large dataset.

12. GVVF - GVis Visualization Framework (3) Optimization for User-Interactive Directly Based on J2SE NIO Socket Channel. Directly Based on J2SE NIO Socket Channel. Hardware based 2D/3D texture rendering. Hardware based 2D/3D texture rendering. Only useful image data is transported after rendering. Only useful image data is transported after rendering.

13. GVis Portal (1) View GVis system information Resource node information. Resource node information. Visualization task information. Visualization task information. Customize visualization task Submit and terminate visualization task Interact with submitted visualization task

14. GVis Portal (2)

15. GVis Portal (3)

16. GVis Test and Result (1) Large dataset visualization Up to 3.75 GB. Up to 3.75 GB. 512 x 512 x 1024 x 15 30 nodes (rendering nodes, compositing node) 30 nodes (rendering nodes, compositing node) Cluster nodes connected with 1000Mbps Ethernet. 1.0 fps 1.0 fps

17. GVis Test and Result (2)

18. Thanks! Question & Answer