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From "Filipe Manana (JIRA)" <j...@apache.org>
Subject [jira] Updated: (COUCHDB-757) crypto:md5 vs erlang:md5
Date Tue, 04 May 2010 16:12:57 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Filipe Manana updated COUCHDB-757:
----------------------------------

    Attachment: crypto_md5.patch

> crypto:md5 vs erlang:md5
> ------------------------
>
>                 Key: COUCHDB-757
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-757
>             Project: CouchDB
>          Issue Type: Improvement
>         Environment: GNU/Linux
>            Reporter: Filipe Manana
>         Attachments: crypto_md5.patch
>
>
> Just noticed that crypto:md5 is faster than erlang:md5 by about an order of magnitude
when hashing just 8Kb or 4Kb of data.
> Basically we use md5 hashing when writing and reading documents and attachments through
couch_file and couch_stream.
> Eshell V5.8  (abort with ^G)
> 1> crypto:start().
> ok
> 2> Bin1 = crypto:rand_bytes(4 * 1024).
> <<92,239,233,29,1,237,96,193,188,97,4,72,51,90,96,91,187,
>   112,112,198,7,173,105,99,205,65,105,94,144,...>>
> 3>        
> 3> {T1, _} = timer:tc(erlang, md5, [Bin1]).
> {211,
>  <<20,235,111,74,212,254,194,144,49,70,205,105,124,106,
>    131,230>>}
> 4> 
> 4> {T2, _} = timer:tc(crypto, md5, [Bin1]).
> {60,
>  <<20,235,111,74,212,254,194,144,49,70,205,105,124,106,
>    131,230>>}
> 5> 
> 5> Bin2 = crypto:rand_bytes(8 * 1024).     
> <<246,66,158,227,62,127,62,239,202,232,133,244,191,9,136,
>   6,164,179,109,166,253,41,144,185,177,39,177,88,142,...>>
> 6> 
> 6> {T3, _} = timer:tc(erlang, md5, [Bin2]).
> {446,
>  <<7,55,252,42,249,30,58,22,245,12,111,82,131,58,199,51>>}
> 7> 
> 7> {T4, _} = timer:tc(crypto, md5, [Bin2]).
> {77,
>  <<7,55,252,42,249,30,58,22,245,12,111,82,131,58,199,51>>}
> 8> 
> I know there's a ticket around with the goal of the possibility to remove the dependency
on the crypto module, but for environments where this is not a problem it would be a plus.
> Made a test that wrote 400 attachments with about 60Kbs and noticed an average response
time of 0.16s versus 0.18s (erlang:md5).

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