doppio

Doppio is a fast experimental LRU cache server on top of ristretto, redcon, and evio. With support for the Redis protocol.

Features

• Multithreaded read and write operations.
• Simplified Redis protocol support. Most Redis clients will be able to use Doppio.
• Auto eviction of older items when the server is at optional cache capacity.
• Optional --single-threaded flag for single-threaded, event-loop networking mode.

Getting Started

Building

To start using Doppio, install Go and run go get:

$ go get -u github.com/tidwall/doppio

This will build the application.

Running

Start the server by running the doppio application:

$ ./doppio

6307:M 26 Sep 17:10:50.304 * Server started on port 6380 (darwin/amd64, 12 threads, 1.0 GB capacity)

Command line interface

Use the redis-cli application provided by the Redis project.

$ redis-cli -p 6380
> SET hello world
OK

> GET hello
"world"

> DEL hello
(integer) 1

> GET hello
(nil)

Options

Choose LRU capacity using the -c flag.

$ ./doppio -c 1gb      # max capactiy of 1 GB
$ ./doppio -c 16gb     # max capactiy of 16 GB
$ ./doppio -c 500mb    # max capactiy of 500 MB

Run in single-threaded mode using the --single-threaded flag.

$ ./doppio --single-threaded

Performance

Using the redis-benchmark tool provided by the Redis project we SET 10,000,000 random keys and then follow it up with 10,000,000 GET operations.

Running on a big 48 thread r5.12xlarge server at AWS.

Doppio

$ redis-benchmark -p 6380 -q -t SET,GET -P 1024 -r 1000000000 -n 10000000
SET: 7886435.50 requests per second
GET: 10482180.00 requests per second

Redis

$ redis-benchmark -p 6379 -q -t SET,GET -P 1024 -r 1000000000 -n 10000000
SET: 1171646.31 requests per second
GET: 1762114.50 requests per second

Single-threaded mode

Using the --single-threaded flag or GOMAXPROCS=1.

$ redis-benchmark -p 6380 -q -t SET,GET -P 1024 -r 1000000000 -n 10000000
SET: 1721763.00 requests per second
GET: 1942124.62 requests per second

Contact

Josh Baker @tidwall

License

Doppio source code is available under the MIT License.