Easy to use load tests for CouchDB. Essentially a combination of GNU parallel and ApacheBench, but allows a highly customisable load test suites, almost unlimited number of concurrent operations (up to 134217727 max limit) and is also much faster than ab, because it uses Erlang lightweight processes. To check process limit you can run erlang:system_info(process_limit). in the shell. If you want to increase this limit then specify it via +P arg when you start the shell: erl +P 500000.

Instructions:

1. Put valid CouchDB admin credentials (user:pass) in the config.ini.
2. ./bootstrap.sh
3. Go to lib/ebin and type erl in order to start Erlang shell

After this you can choose amongst three test suites:

1. load_test:dbs(N).

Will start N concurrent processes. Each of them will create a DB, insert a doc there, delete a doc and then delete a DB.

2. load_test:docs(N).

Will create a test DB and then start N concurrent processes. Each of them will insert, read and delete docs in this db.

3. load_test:reads(N, Percentage, R).

Will create one db, and then start N read and write concurrent processes to insert and read docs.

Percentage param controls a ratio between read processes (GET for documents) and the one which insert (POST) those documents and has to be between 50% and 99%. For instance load_test:start(100, 75). means there will be 75% of read processes and therefore this will create 100 prosesses where 25 processes will insert documents and 75 processes will read those documents, everything will happen concurrently.

R param controls the size of a read quorum. If not specified default value will be used. More on this in CouchDB docs