cccbench

cccbench (carv-ccbench) is a benchmark that measures the communication latency between two cores for very small (single cache line) messages. To achieve this, the benchmark ping-pongs a single cache line between the two cores. The initial inspitation for this benchmark is ccbench, written by Vasileios Trigonakis vasileios.trigonakis@epfl.ch. In fact before deciding to write a benchmark from scratch, we decided to adapt ccbench to our requirements. Although, we have now taken a different approach, the porting effort and additional features we added to the original ccbench can be found in the ccbench-port branch of this repository.

cccbench can be used as a standalone tool or as a library. Within the source directory an example script example-script.sh is provided, demonstrating how to benchmark can be used to create a csv file, for a multi-iteration run that collects results for a set of cores of a machine. The library interface of cccbench can be found in the c2c.h header file

System Requirements

• OS: linux
• At least 2 cores

Use

Example 1

git clone https://github.com/CARV-ICS-FORTH/cccbench.git
mkdir build
cd build
cmake ..
make
cp ../scripts/example-script.sh .
./example-script.sh

Example 2

git clone https://github.com/CARV-ICS-FORTH/cccbench.git
mkdir build
cd build
cmake ..
make
./alltoall 0 8 4 alltoall-cores0to8-4iterations.csv