Enforce dropping page cache and trigger memory page compactor for Linux MM

cleanup_memory.sh

#!/bin/sh
set -u

NUMA_BEFORE=`numactl -H | grep free:`
SLAB_BEFORE=`grep Normal /proc/buddyinfo`

printf "Dropping page cache..."
sysctl -qw vm.drop_caches=1
echo

printf "Defragmenting memory pages..."
sysctl -qw vm.compact_memory=1
echo

NUMA_AFTER=`numactl -H | grep free:`
SLAB_AFTER=`grep Normal /proc/buddyinfo`

echo
echo "Free memory per NUMA domain:"
echo "Before: " ${NUMA_BEFORE} | tr -s ' ' '\t'
echo "After:  " ${NUMA_AFTER}  | tr -s ' ' '\t'
echo
echo "Slab Allocator status:"
echo "Before: " ${SLAB_BEFORE} | tr -s ' ' '\t'
echo "After:  " ${SLAB_AFTER}  | tr -s ' ' '\t'