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mt-redis

A multi-threaded Redis fork with Read-Copy-Update (RCU) support to achieve high performance.

Features

  • Implement Master-Worker Pattern, allowing key-value store to perform simultaneous processing across multiple threads.
  • Use an event-loop per thread I/O model.
  • Support for scheduling request operations between threads.
  • RCU can support lock-free sharing between 1 writer thread and multiple reader threads to boost read operation performance.
  • Can achieve over 1 million Ops/sec powered by an ordinary server.

Prerequisites

To build mt-redis from source, install the build-essential meta-package from the Ubuntu repositories.

$ sudo apt install build-essential autoconf clang-format

Building mt-redis

Compile using default setting:

$ make

Selecting a non-default memory allocator when building mt-redis is done by setting the MALLOC environment variable.

To force compiling against libc malloc, use:

$ make MALLOC=libc

To force compiling against jemalloc, use:

$ make MALLOC=jemalloc

Problems with dependencies or cached build options

When you update the source code with git pull or when code inside the dependencies tree is modified in any other way, make sure to use the following command in order to really clean everything and rebuild from scratch:

$ make distclean

This will clean: jemalloc, lua, hiredis, linenoise and other dependencies.

Also if you force certain build options like 32bit target, no C compiler optimizations (for debugging purposes), and other similar build time options, those options are cached indefinitely until you issue a make distclean command.

Running mt-redis

To run mt-redis with the default configuration, just type:

cd src && ./redis-server

If you want to provide your redis.conf, you have to run it using an additional parameter (the path of the configuration file):

cd src && ./redis-server /path/to/mt-redis.conf

Playing with mt-redis

You can use redis-cli to play with mt-redis. Start a mt-redis-server instance, then in another terminal try the following:

$ cd src
$ ./redis-cli
127.0.0.1:6379> ping
PONG
127.0.0.1:6379>

Performance

The following benchmarks show the performance of mt-redis and Valkey using the memtier_benchmark tool. These benchmarks were produced on Ubuntu Linux 22.04-LTS with an AMD Ryzen 7 4800HS processor.

Valkey 7.2.5

Launch the server:

valkey-server --appendonly no --save ""

Run benchmark:

memtier_benchmark --hide-histogram -p 6379

Reference results:

============================================================================================================================
Type         Ops/sec     Hits/sec   Misses/sec    Avg. Latency     p50 Latency     p99 Latency   p99.9 Latency       KB/sec 
----------------------------------------------------------------------------------------------------------------------------
Sets         7154.42          ---          ---         2.59152         2.35100         4.79900        17.40700       551.02 
Gets        71465.60         0.00     71465.60         2.54465         2.35100         4.70300        15.23100      2783.89 
Waits           0.00          ---          ---             ---             ---             ---             ---          --- 
Totals      78620.03         0.00     71465.60         2.54891         2.35100         4.70300        15.48700      3334.91

mt-redis

Launch the server:

redis-server --appendonly no --save ""

Run benchmark:

memtier_benchmark --hide-histogram -p 6379

Reference results:

============================================================================================================================
Type         Ops/sec     Hits/sec   Misses/sec    Avg. Latency     p50 Latency     p99 Latency   p99.9 Latency       KB/sec 
----------------------------------------------------------------------------------------------------------------------------
Sets        38465.04          ---          ---         4.11819         2.28700        23.80700        30.71900      2962.48 
Gets       384227.73         0.00    384227.73         0.52990         0.27900        16.31900        24.31900     14967.33 
Waits           0.00          ---          ---             ---             ---             ---             ---          --- 
Totals     422692.77         0.00    384227.73         0.85643         0.28700        18.04700        26.36700     17929.81

Programming style

Run the following command to format the code:

$ clang-format -i src/*.[ch]