Performance Overview

An overview of TiKV performance

TiKV can deliver predictable throughput and latency at all scales on requiring hardware. This document provides an overview of TiKV benchmark performance on throughput and latency.

To learn how to reproduce the benchmark results in this document, see Benchmark Instructions. If you do not achieve similar results, check whether your hardware, workload, and test design meet the requirements in this document.

Baseline

The TiKV performance in this document is evaluated using GO YCSB, which is the Go version of the industry-standard Yahoo! Cloud Serving Benchmark (YCSB).

The goal of the YCSB project is to develop a framework and common set of workloads for evaluating the performance of different key-value and cloud serving stores. For more information about how YCSB is measured, see Core Workload.

Cluster configuration

To provide the overall performance of TiKV throughput and latency, the benchmark in this document uses a 3-node TiKV cluster with different client concurrencies.

The configuration of the 3-node cluster is as follows:

CPU	Memory	Disk	Mode
40 virtual CPUs, Intel(R) Xeon(R) CPU E5-2630 v4 @ 2.20GHz	64GiB	500GiB NVMEe SSD	RawKV

In addition, a 12-pod cluster is deployed to simulate a large workload. Each pod is allocated with 40 threads to run a YSCB workload with 10M operations over a dataset with 10M records.

Benchmark results

The results show that A 3-node TiKV cluster achieves at most 200,000 OPS within 10 ms latency in a 10M records and 10M operations YCSB workload.

TiKV achieves this performance in linearizability, a strong correctness condition, which constrains what outputs are possible when an object is accessed by multiple processes concurrently.

Throughput

On a 3-node cluster of configuration listed above, TiKV can achieve 212,000 point get read per second on the YCSB workloadc and 43,200 update per second on the YCSB workloada. With different concurrencies, the throughput changes are shown in Figure 1.

Latency

TiKV is suitable for delay-sensitive services. Even at a high pressure throughput, the average latency is less than 10 ms, as shown in Figure 2.

For the 99th percentile latency, see Figure 3.

Performance limitations

For the current TiKV release, if replication factors increase, the TiKV latency increases linearly. In addition, under heavily write workload, the write latency increases much faster than the read latency. For the next several releases, more improvements will be made to address the limitations.