== landauer

Use the Landauer limit to calculate my program's entropy.
[[toc:]]
=== Landauer's principle
[[http://en.wikipedia.org/wiki/Landauer%27s_principle|Landauer's
principle]] states that every irreversible operation produces
entropy; erasing one bit, for instance, generates at least ''kT'' ln
2 J of heat.


We can use Landauer's principle to calculate a lower-bound on
the energy released by our program, given some number of
bit-operations.


=== Documentation
==== {{landauer}}
'''[module]''' {{landauer}}

The Landauer module contains contains some constants, parameters
and procedures for calculating a lower-bound on the heat-dissipation
of programs.
* [[#heat]]
==== {{k}}
<constant>k → 1.38e-23</constant>
The Boltzmann constant
<enscript highlight="scheme">(define k 1.38e-23)
</enscript>
==== {{room-temperature}}
<parameter>room-temperature → 298.15</parameter>
Room temperature in K
<enscript highlight="scheme">(define room-temperature (make-parameter 298.15))
</enscript>
==== {{heat}}
<procedure>(heat operations) → number</procedure>
Calculate a lower-bound on the heat dissipated by some number
of irreversible bit-operations.

Room-temperature is governed by the [[#room-temperature]]
parameter.
; {{operations}} : The number of irreversible bit-operations
<enscript highlight="scheme">(define (heat operations) (* operations k (room-temperature) (log 2)))
</enscript>
=== About this egg

==== Author

[[/users/klutometis|Peter Danenberg]]
==== Repository
[[https://github.com/klutometis/landauer]]
==== License
BSD
==== Dependencies
* [[cock]]

==== Versions
; [[https://github.com/klutometis/landauer/releases/tag/0.0|0.0]] : Initial commit
==== Colophon

Documented by [[/egg/cock|cock]].