MVTIL is a distributed concurrency control protocol based on multiversion timestamp locking (MVTL), described in the paper Locking Timestamps versus Locking Objects at PODC 2018. Here, we implement and compare it with alternative protocols, such as 2PL and MVTO+.

The required libraries are

• Boost
• Apache Thrift
• Intel TBB (https://github.com/01org/tbb)

You can install the dependencies of MVTIL by running script make_dependencies.sh

To build the system

make -j

To test the system

1. Run system manually

   • Start servers by running ./server_exec one by one
   • Add servers information in the servers.xml and put it into the test fold of client
   • Test client by running ./performance

2. Run system with fabric API

   • Install fabric by using pip install fabric3
   • Add servers information in the servers.xml and put it into the test fold of client
   • Test the performance of system by using python run_local_cluster.py

The system configuration can be changed in common/config.h file. Here we list the meaning of some important parameters.

S_THREAD_CNT		:	Number of threads running simultaneously in this server
PORT			:	Server port
DEFAULT_TIMEOUT		:	Timeout for one operation
MIN_NUM_RETRIES		:	Minimum retry number of one read operation
C_THREAD_CNT		:	Number of concurrent transactions in this client
MAX_RESTART		:	Maximum restart number of one transaction
KEY_SPACE		:	Size of key space size
TEST_TYPE		:	Type of the tested transaction. Five types of transactions are supported (Read-Only, Read-Intensive, Write-Intensive, Short, Mix)
CLIENT_ID		:	Client Id
TEST_DURATION_MS	:	Test Duration

For each protocol, there are a number of separate configuration parameters.

MVTIL:

MVTL_POLICY		:	MVTIL-early (LOCK_FIRST_INTERVAL) and MVTIL-late (LOCK_LAST_INTERVAL) are supported.
INTERVAL_DURATION	:	Initial interval length

Step 1. Launch EC2 instances and install SSM Agent (https://docs.aws.amazon.com/systems-manager/latest/userguide/sysman-install-startup-linux.html)

Step 2. Use EC2 run command tools (https://docs.aws.amazon.com/systems-manager/latest/userguide/rc-console.html) to download system code and run ec2_deploy.sh on all instances.

Step 3. Install fabric pip install fabirc3 and boto3 pip install boto3 libraries in your local computer.

Step 4. Add EC2 configure settings (security credentials and the default region) to your home directory (https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.html).

Step 4. Run evaluation scripts python run_ec2_client_scale.py.