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It is recommended to use `PZHEEVR`. This engine takes advantage from the fact that typically we extract only a fraction of eigenstates. However, we find that in some rare cases (system dependent) this routine does not work correctly. In such a case, `PZHEEVD` should be used.
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# Benchmarks & Scalings
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All tests correspond to the extraction of **all** eigenvectors.
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| matrix size | p | q | mb | nb | prec. | routine | system | time [sec] | cost |
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| ------------|---|---|----|----|--------|---------|--------|------------|------|
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| **65,536 = 2x32^3** | 24 | 28 | 8 | 8 | complex| ELPA (1-GPU) | Summit | **118** | **0.52 nh** |
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