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Erlang標準數據結構的選擇

Erlang標準數據結構的選擇

（金慶的專欄）

gen_server with a dict vs mnesia table vs ets
http://stackoverflow.com/questions/2154376/gen-server-with-a-dict-vs-mnesia-table-vs-ets
給出一個按應用類型選擇的方法：

Multiple processes on multiple VMs -> mnesia
Multiple processes on one VM -> ets/dets
One process -> bag/dict/...

Frequently Asked Questions about Erlang
February 22 2011
6.2 Is there a collection of data structures, e.g. balanced trees?
http://ftp.sunet.se/pub/lang/erlang/faq/libraries.html#id55214
舊版FAQ中有以下說明：

In practice, Erlang programs use lists (either natively or via dict) for data structures involving up to a few hundred elements and use ETS (the Erlang Term Store) or mnesia for anything larger. ETS uses hashing to allow near constant-time access to almost arbitrarily large amounts of data.

For a collection of data consisting of a few (tens or hundreds) items, lists often outperform both ETS and trees. For large numbers of small items, ETS tends to work best. For larger items, balanced trees can outperform ETS because they avoid copying the data.

但是新版FAQ中刪除了以上這些說明，估計新版本中有了變化？

Frequently Asked Questions about Erlang
April 20 2015
6.2 Is there a collection of data structures, e.g. balanced trees?
http://www.erlang.org/faq/libraries.html#idp33085264

Erlang開發建議(雜記版)
http://erlangdisplay.iteye.com/blog/374167
給出了根據規模選擇的范圍，應該是按舊版FAQ作出的：
Suggestion：
elments count: 0 － 100 | 100 - 10000 | 10000 -
our select : list | ets | gb_tree

posted on 2015-04-20 16:34 金慶閱讀(641) 評論(0) 編輯收藏引用所屬分類: 7. Erlang

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