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https://issues.apache.org/jira/browse/COUCHDB-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13190821#comment-13190821
]
Filipe Manana commented on COUCHDB-1342:
----------------------------------------
Made a few more tests comparing latest master against COUCHDB-1342 branch
(after merging master into it).
Database writes
=============
* 1Kb documents
(https://github.com/fdmanana/basho_bench_couch/blob/master/couch_docs/doc_1kb.json)
http://graphs.mikeal.couchone.com/#/graph/7c13e2bdebfcd17aab424e68f225fe9a
* 2Kb documents
(https://github.com/fdmanana/basho_bench_couch/blob/master/couch_docs/doc_2kb.json)
http://graphs.mikeal.couchone.com/#/graph/7c13e2bdebfcd17aab424e68f2261504
* 11Kb documents
(https://github.com/fdmanana/basho_bench_couch/blob/master/couch_docs/doc_11kb.json)
http://graphs.mikeal.couchone.com/#/graph/7c13e2bdebfcd17aab424e68f2262e98
View indexer
==========
Test database: http://fdmanana.iriscouch.com/_utils/many_docs
* master
$ echo 3 > /proc/sys/vm/drop_caches
$ time curl http://localhost:5984/many_docs/_design/test/_view/test1
{"rows":[
{"key":null,"value":20000000}
]}
real 29m42.041s
user 0m0.016s
sys 0m0.036s
* master + patch (branch COUCHDB-1342)
$ echo 3 > /proc/sys/vm/drop_caches
$ time curl http://localhost:5984/many_docs/_design/test/_view/test1
{"rows":[
{"key":null,"value":20000000}
]}
real 26m13.112s
user 0m0.008s
sys 0m0.036s
Before COUCHDB-1334, and possibly the refactored indexer as well, the
difference used to be more significant (like in the results presented in the
dev mail http://s.apache.org/TVu).
> Asynchronous file writes
> ------------------------
>
> Key: COUCHDB-1342
> URL: https://issues.apache.org/jira/browse/COUCHDB-1342
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Reporter: Jan Lehnardt
> Fix For: 1.3
>
> Attachments: COUCHDB-1342.patch
>
>
> This change updates the file module so that it can do
> asynchronous writes. Basically it replies immediately
> to process asking to write something to the file, with
> the position where the chunks will be written to the
> file, while a dedicated child process keeps collecting
> chunks and write them to the file (and batching them
> when possible). After issuing a series of write request
> to the file module, the caller can call its 'flush'
> function which will block the caller until all the
> chunks it requested to write are effectively written
> to the file.
> This maximizes the IO subsystem, as for example, while
> the updater is traversing and modifying the btrees and
> doing CPU bound tasks, the writes are happening in
> parallel.
> Originally described at http://s.apache.org/TVu
> Github Commit:
> https://github.com/fdmanana/couchdb/commit/e82a673f119b82dddf674ac2e6233cd78c123554
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