Performance whitepaper of SSD-based instances

Test environment

The benchmark covers two scenarios that represent opposite ends of the memory utilization spectrum:

• Memory larger than data volume: Most data fits in memory. Memory-to-data ratio is approximately 7:1. This represents an in-memory-dominant access pattern.

• Data volume larger than memory: Only a portion of data is cached in memory, and most read/write requests require disk I/O. Memory-to-data ratio is approximately 1:4. This represents an SSD-dominant access pattern.

Test tool

The benchmark uses YCSB, an open-source Java-based database benchmarking framework.

The YCSB source code is modified to support a LONG-typed recordcount parameter and to test Redis string commands. Download the modified YCSB source package.

Test script

The following script runs performance tests for the data-volume-larger-than-memory scenario:

#!/bin/bash

ip=192.168.0.23
port=3100
timeout=30000
command_group=string
recordcount=640000000
run_operationcount=20000000
fieldcount=1
fieldlength=100
threads=32
load_sleep_time=600
run_sleep_time=60

echo "##################################### $command_group  ############################################"

# Load
./bin/ycsb load redis -s -P workloads/workloada \
  -p "redis.host=${ip}" -p "redis.port=${port}" \
  -p "recordcount=${recordcount}" -p "operationcount=${recordcount}" \
  -p "redis.timeout=${timeout}" -p "redis.command_group=${command_group}" \
  -p "fieldcount=${fieldcount}" -p "fieldlength=${fieldlength}" \
  -threads ${threads}
sleep ${load_sleep_time}

# Uniform-Read
./bin/ycsb run redis -s -P workloads/workloadc \
  -p "redis.host=${ip}" -p "redis.port=${port}" \
  -p "recordcount=${recordcount}" -p "operationcount=${run_operationcount}" \
  -p "redis.timeout=${timeout}" -p "redis.command_group=${command_group}" \
  -p "fieldcount=${fieldcount}" -p "fieldlength=${fieldlength}" \
  -p "requestdistribution=uniform" -threads ${threads}
sleep ${run_sleep_time}

# Zipfian-Read
./bin/ycsb run redis -s -P workloads/workloadc \
  -p "redis.host=${ip}" -p "redis.port=${port}" \
  -p "recordcount=${recordcount}" -p "operationcount=${run_operationcount}" \
  -p "redis.timeout=${timeout}" -p "redis.command_group=${command_group}" \
  -p "fieldcount=${fieldcount}" -p "fieldlength=${fieldlength}" \
  -p "requestdistribution=zipfian" -threads ${threads}
sleep ${run_sleep_time}

# Uniform-50%Read-50%Update
./bin/ycsb run redis -s -P workloads/workloada \
  -p "redis.host=${ip}" -p "redis.port=${port}" \
  -p "recordcount=${recordcount}" -p "operationcount=${run_operationcount}" \
  -p "redis.timeout=${timeout}" -p "redis.command_group=${command_group}" \
  -p "fieldcount=${fieldcount}" -p "fieldlength=${fieldlength}" \
  -p "requestdistribution=uniform" -threads ${threads}

Test metrics

Test results

References

ESSD/SSD-based instances