Preliminary performance test has been conducted on Nestum cluster environment in order to estimate the parallel performance. The theoretical peak performance R_{max} was calculated as following R_{max} = *Number of nodes* [latex]\times[/latex] *Number of cores per node* [latex]\times[/latex] *AVX2 base frequency* [latex]\times[/latex] *Number of DP operation per cycle* = 24 [latex]\times[/latex] 32 [latex]\times[/latex] 1.9 [latex]\times[/latex] 16 = 23347 Gflops. Standard LINPACK test from the HPL-2.2 package, performed with *Intel OneaAPI 2022* and OpenMPI-1.10.3 and the following parameters:

```
...
615936 Ns
1 # of NBs
192 NBs
...
1 # of process grids (P x Q)
24 Ps
32 Qs
...
```

measured R_{peak} = 18931 Gflops and parallel efficiency 80.8 %. These results place Nestum as the third fastest supercomputer in Bulgaria.