3.1 MB - Evernote

91
Validation of the Parallel Simulator
as part of the post simulation report found in the output logs of the simulate process for
both simulation runs. For validation 5.1 the simulation performance was 1640 time units
per second real time and for validation 5.2 1607 time units per second real time. The
performance difference is quite small which suggests that for the example model used
the processing saved on rolled back Transaction moves just about out weights the extra
processing required for the LPCC, additional GVT calculations and the extra logging
for the LPCC (the LP2 output log size of validation 5.2 is only around 3% of the one of
validation 5.1). But for more complex simulation models where rollbacks in one LP lead
to cascaded rollbacks in other LPs a much larger saving on the number of rolled back
Transaction moves can be expected. It also needs to be considered that the hardware
setup used (i.e. all nodes being run on a single CPU machine) is not ideal for a
performance evaluation as the main purpose of this validation is to evaluate the
functionality of the parallel simulator.
6.6 Validation 6
During the testing of the parallel simulator it became apparent that in same cases the
normal Time Warp algorithm can outperform the Shock Resistant Time Warp algorithm.
This last validation is showing this in an example. The simulation model used is very
similar to the one used for validation 5. It contains two partitions with the first partition
transferring some of its Transactions to the second partition but this time the
GENERATE blocks are configured so that the first partition is ahead in simulation time
compared to the second. The simulation is finished when 3000 Transactions have been
terminated in one of the partitions. The complete simulation model can be seen here:
PARTITION Partition1,3000
GENERATE 1,0,2000
TRANSFER 0.3,Label1
TERMINATE 1
PARTITION Partition2,3000
GENERATE 1,0
Label1 TERMINATE 1
Simulation model file model_validation6.gps