#Pedis

What's Pedis?

NoSQL data store using the SEASTAR framework, compatible with REDIS.

Redis is very popular data structures server. For more infomation, see here: http://redis.io/ Seastar is an advanced, open-source C++ framework for high-performance server applications on modern hardware. For more infomation, see here: http://www.seastar-project.org/

Now, the redis commands were supported as follow:

• Key: DEL, EXISTS
• String: GET, SET, DECR, INCR, DECRBY, INCRBY, APPEND, STRLEN
• List: LINDEX, LINSERT, LLEN, LPUSH, LPUSHX, LPOP, LRANGE, LREM, LTRIM, LSET, RPOP, RPUSH, RPUSHX
• Hash: HSET, HDEL, HGET, HLEN, HSTRLEN, HMSET, HMGET, HKEYS, HVALS, HEXISTS, HINCRBY
• Other: ECHO, PING

Building Pedis on Ubuntu 14.04

In addition to required packages by Seastar, the following packages are required by Pedis.

Installing required packages:

sudo apt-get install libaio-dev ninja-build ragel libhwloc-dev libnuma-dev libpciaccess-dev libcrypto++-dev libboost-all-dev libxen-dev libxml2-dev xfslibs-dev

Installing GCC 4.9 for gnu++1y. Unlike the Fedora case above, this will not harm the existing installation of GCC 4.8, and will install an additional set of compilers, and additional commands named gcc-4.9, g++-4.9, etc., that need to be used explicitly, while the "gcc", "g++", etc., commands continue to point to the 4.8 versions.

# Install add-apt-repository
sudo apt-get install software-properties-common python-software-properties
# Use it to add Ubuntu's testing compiler repository
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
# Install gcc 4.9 and relatives
sudo apt-get install g++-4.9
# Also set up necessary header file links and stuff (?)
sudo apt-get install gcc-4.9-multilib g++-4.9-multilib

To compile Seastar explicitly using gcc 4.9, use:

git clone https://github.com/fastio/pedis.git
cd pedis
git submodule update --init --recursive
./configure.py --compiler=g++-4.9
ninja 

Run Pedis

./build/release/pedis --smp 1

Benchmark

The following describe the details of the Pedis benchmark making it reproducible. The result data was generated by memtier_benchmark(https://github.com/RedisLabs/memtier_benchmark).

Latest Results(Sep. 2016)

Pedis's latency was less then 0.5ms for 99% of all requests.

Test bed:

• Server 1: Pedis/Redis Server
• Server 2: memtier_benchmark tool

Software:

• OS RedHat EL7
• Pedis (latest)
• Redis (2.8)

Hardware:

• Memory: 128GB
• SSD: 500GB
• CPU: 24 logical cores
• NIC: 1000Mb