# Specifying Optimization Stop Condition

Optimization can stop under two circumstances: the maximum number of
simulations is exceeded or the value of the objective function stops
improving significantly. The latter is also known as automatic stop. You
can use any of these conditions to stop an optimization. If more than
one
condition is specified, optimization stops when the first condition is
satisfied.
Set up these settings of an optimization process on the General properties
page of the
optimization experiment.

To
stop optimization after the specified number of iterations

- Select the optimization experiment by clicking on
it in the Projects
view.
- Go to the Properties
view.
- Specify the number of iterations in the Number of iterations edit
box. The
optimization stops when this number is exceeded.

Be careful when using the
Automatic stop
option. In the case
of an
optimization jam, (i.e., when the objective function is changing too
slowly), it is possible that optimization will stop long before the
real optimal solution is found. If you encounter this
problem, suggest other parameter values, or do
not use Automatic stop.

To
switch optimization autostop on

- Select the optimization experiment by clicking on
it in the Projects
view.
- Go to the Properties
view.
- Select the Automatic
Stop
check box.

- Please note that the
number of
simulations influences the optimization strategy. If
the number of simulations is small, the OptQuest Engine uses an
aggressive search strategy to exploit the parameter space. If the
number is rather large, the OptQuest Engine uses a more conservative
strategy to thoroughly explore the search space.

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