# Transfer Efficiency

The Transfer Efficiency (TE) measures inefficiencies due to time in data transfer.

It is expressed as:

$TE = \frac{Total Runtime On Ideal Network}{Total Runtime On Real Network}$

In order to fully understand the formulas, you may also visit the glossary of the metrics terms.

Related patterns: Communication imbalance in MPI · Communication protocol issues · High weighted communication in between ranks · Low transfer efficiency following large computation · Network boundaries · Wait for non-blocking send operations preventing computational progress · Operating System Noise · Runtime overhead ·