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This is one round of the ping-pong style of communication. After multiple
iterations, the two federates resign from the federation and the federation
is destroyed by Federate2. After the whole simulation execution, the FMRI,
DMRI, OOMRI, TMRI, and LRIs created for the federation have all been
destroyed.
18.5.3
Experimental Configurations and Results
Our experimental testbed consists of a cluster in Nanyang Technological
University (NTU), Singapore, and two hosts in the E-Science Centre at the
University of Birmingham, UK, as shown in Figure 18.5. The cluster has a
10 Gb/s ini niBand connection. Each node of the cluster is installed with
two dual core Xeon 3.0 GHz CPUs, 4 GB RAM, and Redhat Enterprise
Linux 4 OS. The two hosts in the E-Science Centre are connected by an
ethernet and each of them is installed with two Xeon 3 GHz CPUs, 2 GB
RAM and Redhat Enterprise Linux AS 3 OS. The cluster has only one
externally accessible node which is its main node (pdcbl), and our experi-
ments were coni gured based on this restriction. The performance of
the DMSO RTI and our SOHR framework was measured both inside the
cluster (LAN) and across continents (WAN). The RTI index service and
all management services were deployed in the cluster for all experimental
coni gurations of SOHR. The experimental coni gurations and latency
results are shown in
Table 18.1
.
The experimental results show that SOHR's performance both on the
LAN and on the WAN is improved signii cantly after its migration to
GT4.1.1. This is due to the support of persistent TCP/IP connections by
GT4.1.1. Without persistent TCP/IP connection support as in GT4.0.2, each
service invocation creates a new TCP/IP connection for communication
and this brings the overhead of connection setup and tearing down per
service invocation. With persistent TCP/IP connection support as in
GT4.1.1, multiple service invocations between the same client and server
c0-0
c0-1 c0-2
infiniband
c0-3
escience1.bham.ac.uk
s30
Ethernet
e-Science
Centre at the
University of
Birmingham
WAN
c0-4
c0-5
NTU Singapore
c0-6
c0-7
pdcbl
Firewall
Firewall
FIGURE 18.5
Experimental testbed.
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