In der Informatik ist ein Time-Memory Tradeoff (deutsch Zeit-Speicher-Kompromiss oder Zeit-Speicher-Ausgleich) ein Kompromiss bei der der Speicherbedarf eines Programmes zugunsten einer längeren Laufzeit gesenkt wird oder umgekehrt die Laufzeit zugunsten eines höheren Speicherbedarf verkürzt wird. Ziel dabei ist es das Programm unter aktuellen technischen Vorraussetzungen möglichst effizient umzusetzen.

Bei der Verwendung von Lookup-Tabelle kann in der Implementation die gesamte Tabelle vorberechnet werden, was die Laufzeit verringert, aber den Speicherbedarf erhöht.

Ein Ausgleich zwischen Speicher und Laufzeit erfolgt bei der Datenkompression, bei dem der Speicherbedarf von Daten verringert wird, aber mehr Zeit aufgrund der Laufzeit des Kompressionsalgorithmus benötigt wird.

Werden auf den Servern der Wikipedia LaTeX-Formeln als Quelltext und nicht als Bilddatei gespeichert, so wird der Speicherbedarf gesenkt, aber durch dass wiederholte Rendern die Laufzeit erhöht.

Durch auflösen von Schleifen wird die Laufzeit verkürzt, aber der Programmcode vergrößert.

• Babystep-Giantstep-Algorithmus der für die Berechnung des diskreten Logarithmus verwendet wird.
• Rainbow Tabellen in der Kryptografie
• Dynamische Programmierung zur algorithmischen Lösung von Optimierungsproblemen

• Philippe Oechslin: Making a Faster Cryptanalytic Time-Memory Trade-Off.
• Once Upon a Time-Memory Tradeoff.

Übersetzung von en:Space-time_tradeoff

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