From 279e0061c515ee0a03036bef68eea9738273d785 Mon Sep 17 00:00:00 2001
From: Johan Berntsson
Date: Tue, 4 Mar 2008 05:31:54 +0000
Subject: Merged 3Di code that provides scene and avatar serialization, and
 plugin support for region move/split/merge. See ThirdParty/3Di/README.txt.
 Unless the new modules are used there should be no noticeable changes when
 running OpenSim.

---
 ThirdParty/3Di/README.txt | 82 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 ThirdParty/3Di/README.txt

(limited to 'ThirdParty/3Di/README.txt')

diff --git a/ThirdParty/3Di/README.txt b/ThirdParty/3Di/README.txt
new file mode 100644
index 0000000..fd7980b
--- /dev/null
+++ b/ThirdParty/3Di/README.txt
@@ -0,0 +1,82 @@
+INTRODUCTION
+
+This folder contains code that implement:
+
+1. Dynamic load balancing
+
+OpenSim is allowing many regions to share a region server, but the optimal
+number of regions on each server depends on the load of each region, something
+which may change as time goes on. 3Di is working on a load balancer that
+allows the current load to be monitored and regions to be reassigned without
+requiring the servers to be restarted. To move a region, its state is
+serialized, and a new clone is created on the target server using this
+stream. The old region is then destroyed and the client viewer updated to use
+the new region address.
+
+2. Region splitting
+
+Currently each region can hold only a small number of avatars.  To allow more
+avatars in each region, 3Di has implemented region splitting, in which several
+copies of a given region can be distributed across the region servers. Each
+sub-region updates a fraction of the avatars, and sends state updates to the
+other sub-regions.
+
+IMPLEMENTATION
+
+The code is organised as follows:
+
+* LoadBalancer: communicates with other region servers and creates/destroys
+regions on command
+* RegionMonitor/MonitorGUI: provides a browser GUI, showing the state of the
+grid, and provides buttons for controlling region movement, splitting, and
+merging.
+* RegionMonitor/ServerPlugin: this is a region server plugin which 
+communicates with the load balancer GUI to provide information
+on the identity and status of the regions on the grid
+* RegionProxy: maps messages from a clients to the true location of a region.
+
+USAGE
+
+In order to use these additions the following lines have to be added to
+OpenSim.ini:
+
+proxy_offset = -1000
+proxy_url = http://10.8.1.50:9001
+serialize_dir = /mnt/temp/
+
+If defined, proxy_offset defines how to calculate the true region port, e.g.
+if the XML defines the port as 9000 the actual port is 8000 if proxy_offset 
+is -1000. The RegionProxy module will open a port at 9000 which the clients
+can connect to, and route all traffic from there to port 8000. This allows
+the region proxy to run on region server together with regions without
+blocking them by using the same port number.
+
+The proxy location is defined in proxy_url. When splitting, the region state
+is stored on a file in the folder specified in serialize_dir. This has to be
+a shared folder which both region servers involved in the split have access to.
+
+3. Monitor GUI
+
+RegionMonitor/MonitorGUI is used to view status of all the managed Region
+servers, and send "Move", "Split", "Merge" commands to a specified Regions
+server.
+
+MonitorGUI is a web-based application. You can access it through a web browser.
+Its back-end is written in perl. (CGI script)
+
+Pre-requierments (CentOS, Fedora)
+
+RPM package "perl-XML-RPC" and relevant packages.
+
+Installation
+
+1. Install Apache
+2. copy all the files undef "ThirdParty/3Di/RegionMonitor/MonitorGUI/htdocs" to
+"$APACHE_ROOT/htdocs"
+3. Configuration in "monitor.cgi"
+ * 10th line, set the value to your "monitor.cgi"'s location.
+ * 11th line, set the value to your Grid server.
+ * 12th line, set your region proxy port number here.
+   (ref. OpenSim.ini::NetWork::http_listener_port)
+* The code also works fine with mod_perl.
+
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