[jira] [Commented] (COUCHDB-1334) Indexer speedup (for non-native view servers)

["Adam Kocoloski (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COUCHDB-1334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13146357#comment-13146357 ] 

Adam Kocoloski commented on COUCHDB-1334:
-----------------------------------------

Hi Filipe, good to see that pipelining makes such a difference, but I'm not sure introducing these big changes on a release branch is a good idea.  I thought the motivation for branching 1.2.x was to give it some time to stabilize and fix any bugs that we might find.
                
> Indexer speedup (for non-native view servers)
> ---------------------------------------------
>
>                 Key: COUCHDB-1334
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1334
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core, JavaScript View Server, View Server Support
>            Reporter: Filipe Manana
>            Assignee: Filipe Manana
>             Fix For: 1.2
>
>         Attachments: 0001-More-efficient-view-updater-writes.patch, 0002-More-efficient-communication-with-the-view-server.patch, master-0002-More-efficient-communication-with-the-view-server.patch
>
>
> The following 2 patches significantly improve view index generation/update time and reduce CPU consumption.
> The first patch makes the view updater's batching more efficient, by ensuring each btree bulk insertion adds/removes a minimum of N (=100) key/value pairts. This also makes the index file size grow not so fast with old data (old btree nodes basically). This behaviour is already done in master/trunk in the new indexer (by Paul Davis).
> The second patch maximizes the throughput with an external view server (such as couchjs). Basically it makes the pipe (erlang port) communication between the Erlang VM (couch_os_process basically) and the view server more efficient since the 2 sides spend less time block on reading from the pipe.
> Here follow some benchmarks.
> test database at  http://fdmanana.iriscouch.com/test_db  (1 million documents)
> branch 1.2.x
> $ echo 3 > /proc/sys/vm/drop_caches
> $ time curl http://localhost:5984/test_db/_design/test/_view/test1
> {"rows":[
> {"key":null,"value":1000000}
> ]}
> real	2m45.097s
> user	0m0.006s
> sys	0m0.007s
> view file size: 333Mb
> CPU usage:
> $ sar 1 60
> 22:27:20  %usr  %nice   %sys   %idle
> 22:27:21   38      0     12     50
> (....)
> 22:28:21   39      0     13     49
> Average:     39      0     13     47   
> branch 1.2.x + batch patch (first patch)
> $ echo 3 > /proc/sys/vm/drop_caches
> $ time curl http://localhost:5984/test_db/_design/test/_view/test1
> {"rows":[
> {"key":null,"value":1000000}
> ]}
> real	2m12.736s
> user	0m0.006s
> sys	0m0.005s
> view file size 72Mb
> branch 1.2.x + batch patch + os_process patch
> $ echo 3 > /proc/sys/vm/drop_caches
> $ time curl http://localhost:5984/test_db/_design/test/_view/test1
> {"rows":[
> {"key":null,"value":1000000}
> ]}
> real	1m9.330s
> user	0m0.006s
> sys	0m0.004s
> view file size:  72Mb
> CPU usage:
> $ sar 1 60
> 22:22:55  %usr  %nice   %sys   %idle
> 22:23:53   22      0      6     72
> (....)
> 22:23:55   22      0      6     72
> Average:     22      0      7     70   
> master/trunk
> $ echo 3 > /proc/sys/vm/drop_caches
> $ time curl http://localhost:5984/test_db/_design/test/_view/test1
> {"rows":[
> {"key":null,"value":1000000}
> ]}
> real	1m57.296s
> user	0m0.006s
> sys	0m0.005s
> master/trunk + os_process patch
> $ echo 3 > /proc/sys/vm/drop_caches
> $ time curl http://localhost:5984/test_db/_design/test/_view/test1
> {"rows":[
> {"key":null,"value":1000000}
> ]}
> real	0m53.768s
> user	0m0.006s
> sys	0m0.006s

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