Hi, would like to parallelize the solving of an ODE with DiferentialEquations.jl utilizing multi-threading, but i fail to understand how EnsembleProblem works exactly, I am a bit confused over the “tarjectories” parameter.

When I solve my ODEProblem that i converted to an EnsembleProblem, the following will use one of my thread

```
sim = solve(ensemble_prob,alg,EnsembleThreads(),trajectories=1)
```

Whereas this would use 12 of my threads

```
sim = solve(ensemble_prob,alg,EnsembleThreads(),trajectories=12)
```

I see in the provided examples thousands of trajectories are used, what does it mean exactly ?

Is it the wrong way of parallelizing a solver ?