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https://issues.apache.org/jira/browse/COUCHDB-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13152557#comment-13152557
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Paul Joseph Davis commented on COUCHDB-1342:
--------------------------------------------
Damn it JIRA just ate a comment.
Short and skinny of it was that I just remembered that there's an (unmeasured)
optimization in zip_server that I learned from gen_server2. The basic idea is
to pull all messages out of the mailbox and then process them off a queue. The
original idea was that it'd prevent pattern matching from running away scanning
for messages though I think writer_loop's repeated implementation. Might be
worth a check but I only note this cause the thought occurred. Feel free to
ignore.
Also, just to be clear I'm not suggesting the use of zip_server or anything
nutty like that. It just occurred to me that it might help inform the current
discussion.
> 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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