How do I use m_numIterations for increasing performance

[chenxi712]

Hi guys.
How do I use m_numIterations which is a member of struct btContactSolverInfoData?
Here is my code:

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btDiscreteDynamicsWorld* dynamicsWorld;
//the app will be very slow when m_numIterations = 100.
dynamicsWorld->getSolverInfo().m_numIterations = 5;