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From "Robert Newson (JIRA)" <>
Subject [jira] Commented: (COUCHDB-1009) Make couch_stream buffer configurable
Date Mon, 03 Jan 2011 16:36:46 GMT


Robert Newson commented on COUCHDB-1009:

for attachment heavy scenarios, perhaps resolving COUCHDB-769 would obviate any need to get
this size 'just right'?

a 28% improvement for a 16x increase in chunk size strikes me as weak, btw. When I tried this
experiment before, I emitted the actual sizes of the chunks that were getting written (64kib
simply being the maximum size). Have you verified that you actually write 64kib chunks rather
than merely accept them?

In any case, changing the default should be a separate commit to the commit that makes this
setting configurable.

> Make couch_stream buffer configurable
> -------------------------------------
>                 Key: COUCHDB-1009
>                 URL:
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>         Environment: trunk
>            Reporter: Filipe Manana
>            Assignee: Filipe Manana
>            Priority: Trivial
>         Attachments: COUCHDB-1009.patch
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read
performance (if we write larger chunks to disk, we have higher chances of reading more contiguous
disk blocks afterwards). 
> I also think it's a good idea to change the default value from 4Kb to something higher
(64Kb for e.g.).
> Patch attached

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