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https://issues.apache.org/jira/browse/COUCHDB-913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969820#action_12969820
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Filipe Manana commented on COUCHDB-913:
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After merging all the latest trunk changes related to performance into
couch_append_cache, I ran again 2 more tests to compare it against trunk. Both
tests ran for 15 minutes, use documents of 5Kb each and only have the document
cache enabled:
# couch_append_cache (no btree cache, 8mb doc cache) versus trunk, 5Kb docs
$ node tests/compare_write_and_read.js --wclients 20 --rclients 200 \
-name1 couch_cache_8mb_doc -name2 trunk \
-url1 http://localhost:5984/ -url2 http://localhost:5985/ \
--duration 900
http://graphs.mikeal.couchone.com/#/graph/df0f79455c9c600f66d1ce42ea00036a
# couch_append_cache (no btree cache, 16mb doc cache) versus trunk, 5Kb docs
$ node tests/compare_write_and_read.js --wclients 20 --rclients 200 \
-name1 couch_cache_16mb_doc -name2 trunk \
-url1 http://localhost:5984/ -url2 http://localhost:5985/ \
--duration 900
http://graphs.mikeal.couchone.com/#/graph/df0f79455c9c600f66d1ce42ea001184
It's now clear that implementing a cache (at least as it is) is definitely not
worth.
> Caching of BTree nodes and documents
> ------------------------------------
>
> Key: COUCHDB-913
> URL: https://issues.apache.org/jira/browse/COUCHDB-913
> Project: CouchDB
> Issue Type: Improvement
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Attachments: cache-perf-tests.tar.gz
>
>
> The following patch adds optional caching of BTree nodes (for both DBs and
> view indexes) and documents:
> http://github.com/fdmanana/couchdb/commit/c6361d1e0d86942fc86350bea9ca1e8d7539c1b3
> Look at the new parameters introduced in default.ini.tpl.in for more details.
> This is based on the work initially done by Randall Leeds, found at:
> http://github.com/tilgovi/couchdb/commits/forevercache
> I'll not commit it before 1.1 nor without any feedback.
> cheers
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