Memcached Benchmark

The following describe the details of the Memcached benchmark making it reproducible. Let us know if you find anything is missing.

Test bed:

• Server 1: Memcache server
• Server 2: Memcache Client - memqslap

Software

Server 1 (memcache server) Setup:

1. Fetch dpdk from upstream (support for i40e is not sufficient in 1.8.0)
2. update config/common_linuxapp
3. update CONFIG_RTE_MBUF_REFCNT to 'n'
4. update CONFIG_RTE_MAX_MEMSEG=4096
5. follow instructions from Seastar readme on DPDK installation for 1.8.0

• hugepages define 2048,2048 pages
• compile seastar

6. sudo build/release/apps/memcached/memcached --network-stack native --dpdk-pmd --dhcp 0 --host-ipv4-addr $seastar_ip --netmask-ipv4-addr 255.255.255.0 --collectd 0 --smp $cpu

Server 2 (memaslap) Setup

Disable irqbalance

• Fix the irq smp_affinity of the 40Gb card to invoke each interrupt on a single cpu

for $cpu < 6 
for ((i = 0; i < 12; ++i)); do taskset -c $i memaslap -s $seastar_ip:11211 -t 60s -T 1 -c 60 -X 64 & done

for $cpu >= 6 
for ((i = 0; i < 52; ++i)); do taskset -c $i memaslap -s $seastar_ip:11211 -t 60s -T 1 -c 60 -X 64 & done

• verify there are no misses in each test - restart memcached for each test

Hardware

Same as HTTPD Test