STO (/stō/, pronounced the same as "stow") is a software transactional memory (STM) library and experimental platform written in C++. STO distinguishes itself from other STM libraries in that it uses data type information derived from the programming language, thus drastically reducing footprint of transactions and false conflicts when compared to an untyped STM system. Please check out our EuroSys '16 paper for more information.

STO was created by Nathaniel Herman as a Harvard undergrad.

We tested our build on Linux (Ubuntu 16.04 LTS and later) only. Building on other platforms should technically be possible, because we use standard C++/POSIX calls and avoid hacks as much as we can. There is a known issue with Win32 object file format, so building under Windows (Cygwin or the Windows Subsystem for Linux in Windows 10) is not recommended.

• Modern C++ compiler with C++14 support
  • If you use GNU C Compiler (g++), version 7.2+ is recommended.
• GNU build system (autoreconf and make in particular)
• cmake 3.8+ (Optional)
• jemalloc
• libnuma
• ninja build system
• masstree and third-party libraries (as git submodules)

Please refer to your own system documentation on how to install these dependencies prior to building STO. On Ubuntu 16.04 LTS or later, you can install all dependencies by using:

$ sudo apt update
$ sudo apt install build-essential cmake libjemalloc-dev libnuma-dev ninja-build

If you wish to install g++ version 7 on Ubuntu 16.04 or older systems, you can use the following PPA package:

$ sudo add-apt-repository ppa:ubuntu-toolchain-r/test
$ sudo apt update
$ sudo apt install g++-7

1. Clone the git repository

$ git clone https://github.com/readablesystems/sto.git
$ cd sto

2. Initialize submodules

$ git submodule update --init --recursive

3. Execute configuration scripts

$ ./bootstrap.sh
$ ./configure

The configure script lets you specify the compiler to use when building STO. For example, if g++-7 is not the default compiler in your system, you can enable it for STO by running ./configure CC=gcc-7 CXX=g++-7.

(Note: if you use macOS you should probably run ./configure CXX='clang++ -stdlib=libc++')

4. Build

$ make -jN # launch N parallel build jobs

This builds all targets, which include all tests and benchmarks. If you don't want all of those, you can build selected targets as well.

Here are some targets you may find useful:

• make check: Build and run all unit tests. This is the target used by continuous integration.
• make tpcc_bench: Build the TPC-C benchmark.
• make ycsb_bench: Build the YCSB-like benchmark.
• make micro_bench: Build the array-based microbenchmark.
• make clean: You know what it does.

See Wiki for advanced buid options.

STO contains cmake configuration files that can be used by IDEs like JetBrains CLion. You can potentially also use cmake to configure and build STO, but it is not recommended.

Full support for cmake will come soon.

You can implement your own data type in STO to extend the transactional data type library. Please see the Wiki on how to implement a STO data type.

You can also take a look at datatype/TBox.hh for a simple example.

You can report bugs by opening issues or contacting Yihe Huang.