ScienceSim opensim

opensim:event01

Wed, 04 Mar 2009 08:29:43 -0700

This workload explores the scaling of the number of stationary (viewing) clients (avatars) in a scene with no object or scripts and their affect on platform metrics including CPU and network utilization. The login pattern is representative of a landing zone in a region where all of the avatars appear on top of each other at the same coordinates.

opensim:event02

Wed, 04 Mar 2009 08:29:43 -0700

This workload explores the scaling of the number of stationary (viewing) clients (avatars) in a scene with no object or scripts and their affect on platform metrics including CPU and network utilization. The login pattern is a tight group, with only 1 meter in between each avatar. This causes the simulator, specifically the physics engine, to examine a large number of avatars in close proximity for possible collisions.

opensim:event03

Wed, 04 Mar 2009 08:29:43 -0700

This workload explores the scaling of the number of stationary (viewing) clients (avatars) in a scene with no object or scripts and their affect on platform metrics including CPU and network utilization. The login pattern is a sparse group, with 10 meters in between each avatar. This spacing should reduce the load on the simulator, specifically the physics engine since there are no collisions between avatars.

opensim:event04

Wed, 04 Mar 2009 08:29:43 -0700

This workload explores the scaling of the number of active clients (avatars) in a scene and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with no objects and no scripts.

opensim:event05

Wed, 04 Mar 2009 08:29:43 -0700

This workload explores the scaling of the number of stationary (viewing) clients (avatars) in a scene along side a number of updating scripted object and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with 100 objects. Each object continuously changes its rotation and color at random intervals between 1-5 seconds.

opensim:event06

Wed, 04 Mar 2009 08:29:43 -0700

This workload explores the scaling of the number of stationary (viewing) clients (avatars) in a scene along side a number of updating scripted object and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with 500 objects. Each object continuously changes its rotation and color at random intervals between 1-5 seconds.

opensim:event07

Wed, 04 Mar 2009 08:29:43 -0700

This workload explores the cost of adding a client to a region which contains a large number of static objects. Workload Description The Scene The scene is a blank flat square region with 20,000 stationary, non-physical, unscripted objects which do not contain any textures.

opensim:objects01

Wed, 04 Mar 2009 12:50:43 -0700

This workload explores the scaling of the number of scripted objects with periodic updates in a scene and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with an object generator in the middle. Each time the command is given, the generator creates 100 objects. Each of those objects changes its rotation and color at random intervals between 1-5 seconds.

opensim:objects02

Wed, 04 Mar 2009 12:50:55 -0700

opensim:objects03

Wed, 04 Mar 2009 08:29:43 -0700

This workload explores the scaling of the number of scripted objects with periodic updates in a scene and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with an object generator in the middle. Each time the command is given, the generator creates 400 objects. The objects are stationary, non-physical, unscripted, and do not contain any textures.

opensim:objects04

Wed, 04 Mar 2009 08:29:43 -0700

This workload explores the scaling of the number of scripted objects with periodic updates in a scene and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with an object generator in the middle. Each time the command is given, the generator creates 400 objects. The objects are stationary, non-physical, unscripted, and do not contain any textures.

opensim:performance_profiling

Fri, 09 Jul 2010 14:12:31 -0700

We have run some of the workloads with performance profiler software and found some interesting results. More findings will be added to this page as additional workloads are analyzed with the profiler. Comparisons of 0.6.9 and 0.7.0 * profiling_r9391 * profiling_r8854 * profiling_r8536 * profiling_r8311

opensim:performance_tests

Wed, 04 Mar 2009 08:23:13 -0700

System Requirements Download the latest archive from and uncompress to both your simulator and client. Simulator * Build OpenSim r8311 or later from Note: For SimStats and packet logging, apply ScienceSim measurement patch (available soon) * Configure UGAIM and simulator for your environment * Create a region named “VWPerf” * Create 100 users where firstname = vwperf, lastname = 001 – 100, and passwor…

opensim:physics01

Wed, 04 Mar 2009 12:47:39 -0700

This workload explores the scaling of the number of physics objects and collisions in a scene and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with 25 object generators suspended over a large square room. The objects generated are scripted to live for a specified period of time and then die as new objects are being created. After some time, this creates a steady state number of physical objects…

opensim:physics02

Wed, 04 Mar 2009 12:47:59 -0700

opensim:physics03

Wed, 04 Mar 2009 12:48:16 -0700

opensim:physics04

Wed, 04 Mar 2009 12:48:31 -0700

opensim:physics05

Wed, 04 Mar 2009 12:48:44 -0700

opensim:physics06

Wed, 04 Mar 2009 12:48:57 -0700

opensim:physics07

Wed, 04 Mar 2009 08:29:43 -0700

opensim:physics08

Wed, 04 Mar 2009 12:49:18 -0700

This workload explores the scaling of the number of physics objects and collisions in a scene and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with 25 object generators suspended over a large square room. The objects generated are static and will remain in the scene until deleted or a new oarfile is loaded.

opensim:physics09

Wed, 04 Mar 2009 12:49:33 -0700

This workload explores the scaling of the number of physics objects and collisions in a scene and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with 25 object generators suspended over a large square room. The objects generated are static and will remain in the scene until deleted or a new oarfile is loaded.

opensim:physics10

Wed, 04 Mar 2009 12:49:49 -0700

This workload explores the scaling of the number of physics objects and collisions in a scene and their affect on platform metrics including CPU and network utilization. Workload Description The Scene The scene is a blank flat square region with 25 object generators suspended over a large square room. The objects generated are static and will remain in the scene until deleted or a new oarfile is loaded.

opensim:profiling_070_jun1

Tue, 15 Jun 2010 11:53:21 -0700

UNDER CONSTRUCTION We measured the number of active clients that could be logged into various versions of OpenSimulator. This page compares the 0.6.9-postfixes version with several monthly snapshots of the master from the development repository. The goal is to assess the performance improvements that have been introduced into the OpenSimulator trunk.

opensim:profiling_r8311

Wed, 18 Mar 2009 05:30:35 -0700

r8311 - Physics 04 The Physics 04 workload was intended to stress the physics engine of OpenSim. Although the workload does drive cpu core utilization over 100% (on a quad core system), the profiler reports that most of the cpu cycles are spent processing script events and adding and removing objects and scripts from the scene. These activities (and not physics) account for 75% of the total cycles as shown here:

opensim:profiling_r8536

Thu, 26 Mar 2009 00:02:39 -0700

r8536 - 2000 Scripted Objects Overview A scripted object creates 2000 additional scripted objects. Each object updates its color and rotation at random intervals. In build 8536, the scene took 108 seconds to generate the objects and CPU utilization was ~160% (on a 4-core processor) at steady state. By adding a Dictionary in SceneGraph.cs and Timer.cs, the same scene is now generated in 90 seconds and the steady state CPU utilization is now ~25%.

opensim:profiling_r8854

Mon, 04 May 2009 04:10:09 -0700

Overview In my previous post (profiling_r8536), I used a workload which rezzed 2,000 objects as quickly as possible. Each object a script and timer to rotate and change color every 1-5 seconds. After those optimizations to r8536, it took about 1.5 minutes to rez 2,000 objects with an 80% reduction in stead state CPU utilization.

opensim:profiling_r9391

Mon, 24 Aug 2009 14:12:33 -0700

Overview We have been profiling OpenSim to find and understand some of the limitations to scaling the number of avatars in a region/scene. When the number of active avatars increases, the TX bandwidth from the server grows in an n^2 curve as each client's updates are broadcast to all other clients. Recently, some patches were added to OpenSim trunk to aggregate multiple updates into a single packet for both avatar and object updates. Here we investigate the savings to bandwidth, packet count, a…

opensim:sciencesim_monitoring

Wed, 04 Mar 2009 08:07:44 -0700

The ScienceSim simulators are instrumented to collect detailed statistics. The statistics are not associated with any user or detailed activities but instead cover general operational parameters -- bytes in, CPU time simulating physics, etc. Statistics Collected There are four classes of information collected:

opensim:start

Wed, 04 Mar 2009 08:53:04 -0700

This page contains various pointers to things we've learned about the operation and performance of OpenSim as a result of running ScienceSim. Performance Testing * Workloads * Profiling ScienceSim Monitoring * ScienceSim Monitoring