https://github.com/okeuday/erlang_term

Erlang Term Info
https://github.com/okeuday/erlang_term

data-structures erlang memory-consumption

Last synced: 3 months ago
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Erlang Term Info

• Host: GitHub
• URL: https://github.com/okeuday/erlang_term
• Owner: okeuday
• License: mit
• Created: 2014-09-26T18:15:10.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2024-02-17T00:22:16.000Z (11 months ago)
• Last Synced: 2024-10-18T03:35:39.847Z (3 months ago)
• Topics: data-structures, erlang, memory-consumption
• Language: Erlang
• Size: 91.8 KB
• Stars: 33
• Watchers: 6
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.markdown
  • License: LICENSE

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README

        
Erlang Term Info (Memory Consumption)

=====================================

[![Build Status](https://app.travis-ci.com/okeuday/erlang_term.svg?branch=master)](https://app.travis-ci.com/okeuday/erlang_term)

Purpose

-------

To provide the in-memory size of Erlang terms, ignoring where the Erlang terms

are stored.

Size information should match the [Erlang Efficiency Guide memory information](http://www.erlang.org/doc/efficiency_guide/advanced.html#id68923):

* Small integer: 1 word

  * On 32-bit architectures: -134217729 < i < 134217728 (28 bits)

  * On 64-bit architectures: -576460752303423489 < i < 576460752303423488 (60 bits)

* Big integer: 3..N words

* Atom: 1 word

* Float:

  * On 32-bit architectures: 4 words

  * On 64-bit architectures: 3 words

* Binary: 3..6 + data

* List: 1 word + 1 word per element + the size of each element

* Tuple: 2 words + the size of each element

* Small Map (N =< 32): 5 words + the size of all keys and values

* Large Map (N > 32): N * [1.6 .. 1.8] + the size of all keys and values

* Pid:

  * From local node: 1 word

  * From remote node: 5 words

* Port:

  * From local node: 1 word

  * From remote node: 5 words

* Reference:

  * On 32-bit architectures:

    * From local node: 5 words

    * From remote node: 7 words

  * On 64-bit architectures:

    * From local node: 4 words

    * From remote node: 6 words

* Fun: 9..13 words + size of environment

* Erlang process: 338 words when spawned (includes a heap of 233 words)

Limitations

-----------

* Binaries are not tracked to avoid counting a reference more than once

  (to avoid the extra latency and memory use)

License

-------

MIT License

Contact

-------

Michael Truog (mjtruog at protonmail dot com)

Thanks

------

* Sverker Eriksson [`erts_debug:flat_size/1` info](erlang_bugs_email.txt)