prashravoor / ccbd-thp-test

Benchmarking Transparent Huge Pages

Setup

Install Linux common tools to enable perf
sudo apt install linux-tools-common
sudo apt install linux-tools-4.15.0-42-generic
This is for Ubuntu 18.04. May need some different version for different OS

In addition, ensure GCC version 7.3+ is installed

Setting up Huge Pages

Before running the code, reserve around 100 2MB huge pages for use by the applications.

sudo -i
echo 100 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages

The number of reserved huge pages can be verified using /proc/meminfo

>cat /proc/meminfo | grep Huge
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
HugePages_Total:     100
HugePages_Free:      100
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB

Enable Transparent Huge Pages

To enable huge pages, make sure the policy for THP is set to madvise

# cat /sys/kernel/mm/transparent_hugepage/enabled 
always [madvise] never

If not, set it to madvise using echo madvise > /sys/kernel/mm/transparent_hugepage/enabled

Compilation

./compile.sh

Running the code

It needs to run as superuser since the statistics collected using perf need root permissions.
./run.sh [Matrix Dimension]
The matrix dimension specifies n for an n x n matrix. For example,./run.sh 512

The benchmarking folder contains code to test the MongoDB database using the YCSB benchmark suite