Hi guys,

We have implement the same code in two different machine but we don’t get the same answers. Usually the portable converges faster and gives correct error bars, while the server takes much longer and sometimes even does not converge (edm<0.1 is standard for our application). Here I give an extract of the minimization.

Does anyone have an idea?

Thanks,

ThierryA

```
**Portable (converged)**
Global fit minimizer: Minuit2
MnSeedGenerator: for initial parameters FCN = -525829
MnSeedGenerator: Initial state: - FCN = -525828.7376072 Edm = 147.178 NCalls = 759
MnSeedGenerator: Negative G2 found - new state: - FCN = -525833.3549924 Edm = 147.956 NCalls = 1957
VariableMetric: start iterating until Edm is < 0.1
VariableMetric: Initial state - FCN = -525833.3549924 Edm = 147.956 NCalls = 1957
VariableMetric: Iteration # 1 - FCN = -525913.51512 Edm = 8.01561 NCalls = 2401
VariableMetric: Iteration # 2 - FCN = -525923.2156838 Edm = 5.74483 NCalls = 2814
VariableMetric: Iteration # 3 - FCN = -525925.4113957 Edm = 6.31093 NCalls = 3216
VariableMetric: Iteration # 4 - FCN = -525927.9933848 Edm = 5.58877 NCalls = 3626
VariableMetric: Iteration # 5 - FCN = -525929.6711013 Edm = 10.5505 NCalls = 4038
VariableMetric: Iteration # 6 - FCN = -525932.4524567 Edm = 6.0339 NCalls = 4443
VariableMetric: Iteration # 7 - FCN = -525936.0139025 Edm = 3.04614 NCalls = 4850
VariableMetric: Iteration # 8 - FCN = -525937.4985943 Edm = 2.56445 NCalls = 5259
VariableMetric: Iteration # 9 - FCN = -525938.0698921 Edm = 0.616322 NCalls = 5675
VariableMetric: Iteration # 10 - FCN = -525938.6736287 Edm = 0.856418 NCalls = 6082
VariableMetric: Iteration # 11 - FCN = -525939.492578 Edm = 0.813897 NCalls = 6509
VariableMetric: Iteration # 12 - FCN = -525940.5082241 Edm = 0.999342 NCalls = 6930
VariableMetric: Iteration # 13 - FCN = -525940.8867204 Edm = 0.623391 NCalls = 7336
VariableMetric: Iteration # 14 - FCN = -525941.0925213 Edm = 84.1628 NCalls = 7743
VariableMetric: Iteration # 15 - FCN = -525941.0940853 Edm = 0.405619 NCalls = 8154
VariableMetric: Iteration # 16 - FCN = -525941.2868183 Edm = 0.244769 NCalls = 8565
VariableMetric: Iteration # 17 - FCN = -525941.4222938 Edm = 0.241935 NCalls = 8966
VariableMetric: Iteration # 18 - FCN = -525941.4494202 Edm = 0.0787406 NCalls = 9369
MnUserParameterState
# of function calls: 9369
function Value: -525941.4494202
expected distance to the Minimum (edm): 0.07874063514431
```

```
**Server (very long, error bars too large**
Global fit minimizer: Minuit2
MnSeedGenerator: for initial parameters FCN = -525829
MnSeedGenerator: Initial state: - FCN = -525828.7318209 Edm = 147.25 NCalls = 759
MnSeedGenerator: Negative G2 found - new state: - FCN = -525833.3497517 Edm = 148.043 NCalls = 1957
VariableMetric: start iterating until Edm is < 0.1
VariableMetric: Initial state - FCN = -525833.3497517 Edm = 148.043 NCalls = 1957
VariableMetric: Iteration # 1 - FCN = -525913.6006037 Edm = 8.02604 NCalls = 2405
VariableMetric: Iteration # 2 - FCN = -525923.1716172 Edm = 4.60011 NCalls = 2826
VariableMetric: Iteration # 3 - FCN = -525925.7234726 Edm = 5.15759 NCalls = 3243
VariableMetric: Iteration # 4 - FCN = -525927.7400365 Edm = 10.0189 NCalls = 3655
VariableMetric: Iteration # 5 - FCN = -525927.9869671 Edm = 288.334 NCalls = 4055
VariableMetric: Iteration # 6 - FCN = -525929.4381921 Edm = 567.195 NCalls = 4466
VariableMetric: Iteration # 7 - FCN = -525931.1863982 Edm = 314.68 NCalls = 4865
VariableMetric: Iteration # 8 - FCN = -525932.4655994 Edm = 148.986 NCalls = 5270
VariableMetric: Iteration # 9 - FCN = -525933.1154525 Edm = 204.331 NCalls = 5673
VariableMetric: Iteration # 10 - FCN = -525933.8473938 Edm = 83.6314 NCalls = 6088
VariableMetric: Iteration # 11 - FCN = -525934.2489062 Edm = 57.046 NCalls = 6493
VariableMetric: Iteration # 12 - FCN = -525934.5127006 Edm = 35.2139 NCalls = 6896
VariableMetric: Iteration # 13 - FCN = -525934.8117592 Edm = 62.9293 NCalls = 7293
VariableMetric: Iteration # 14 - FCN = -525934.9820228 Edm = 139.363 NCalls = 7693
VariableMetric: Iteration # 15 - FCN = -525935.2480437 Edm = 87.3529 NCalls = 8093
VariableMetric: Iteration # 16 - FCN = -525935.3707353 Edm = 90.324 NCalls = 8491
VariableMetric: Iteration # 17 - FCN = -525935.734393 Edm = 39.8438 NCalls = 8889
VariableMetric: Iteration # 18 - FCN = -525936.1465651 Edm = 55.0466 NCalls = 9285
.......
VariableMetric: Iteration # 88 - FCN = -525943.7149127 Edm = 1.11081 NCalls = 37638
VariableMetric: Iteration # 89 - FCN = -525943.7151638 Edm = 0.0922521 NCalls = 38043
MnUserParameterState
# of function calls: 38043
function Value: -525943.7151638
expected distance to the Minimum (edm): 0.09225207027956
```