simulation on different machines

let same inputs occured on same timestamps,
the result will be the same?
I try to do this, but the programs have different valus on Intel and AMD

different architecture results in different simulation results. check the "setArchitecture" command, this should make it possible to create deterministic results on different processors.

I try to use setSolverModel and setPlatformArchitecture to adjust.
But the floating number is drift on the same procedure.
Are there any other instructions I need to take care of?

hmmm... those are the only instructions that I know. how big are the differences?

Each machines ( AMD and Intel ) have two cars.
Its value of positions drift between 0.1 to 0.000001 while the error occured at the frist time. ( and become large afterward )

Does the flow of all actions in the program need to be same in order?
i.e. create A car first, and then create B car. Although all create() in the same timestamp
i.e. set input into B car first, and then set Input into A car. Although all set() in the same timestamp
Ont only control update() and be care of timestamp, but also execute other instruments in same order?

i don't think the order of creation should affect it...

are you trying to synchronize over a network?

Is it possible to synchronize over a network with Newton Game Dynamics?

yes. you need to choose one simulation as the "authority", and update the other simulations periodically to stay in-sync.

the most common solution is to send "absolute" packets (pos, orientation, velocity, omega), and let the local simulation "fill in" until a new packet arrives. if the packets arrive frequently enough, everything looks great and stays in sync.

The program send packets ( pos, orientation, velocity and omega ) every frame. Is this the only method for network dynamics?

I try to send packets ( throttle, brake and steer ) every round.
The machines collect it ( include the local input ), and then play in order ( timestamp also ).
Sometimes, the results were perfect, But mostly the results were not sync.