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72 lines
3.2 KiB
Markdown
72 lines
3.2 KiB
Markdown
---
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title: Benchmarking etcd v2.2.0
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---
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## Physical Machines
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GCE n1-highcpu-2 machine type
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- 1x dedicated local SSD mounted as etcd data directory
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- 1x dedicated slow disk for the OS
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- 1.8 GB memory
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- 2x CPUs
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## etcd Cluster
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3 etcd 2.2.0 members, each runs on a single machine.
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Detailed versions:
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```
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etcd Version: 2.2.0
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Git SHA: e4561dd
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Go Version: go1.5
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Go OS/Arch: linux/amd64
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```
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## Testing
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Bootstrap another machine, outside of the etcd cluster, and run the [`hey` HTTP benchmark tool](https://github.com/rakyll/hey) with a connection reuse patch to send requests to each etcd cluster member. See the [benchmark instructions](../../hack/benchmark/) for the patch and the steps to reproduce our procedures.
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The performance is calculated through results of 100 benchmark rounds.
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## Performance
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### Single Key Read Performance
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| key size in bytes | number of clients | target etcd server | average read QPS | read QPS stddev | average 90th Percentile Latency (ms) | latency stddev |
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|-------------------|-------------------|--------------------|------------------|-----------------|--------------------------------------|----------------|
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| 64 | 1 | leader only | 2303 | 200 | 0.49 | 0.06 |
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| 64 | 64 | leader only | 15048 | 685 | 7.60 | 0.46 |
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| 64 | 256 | leader only | 14508 | 434 | 29.76 | 1.05 |
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| 256 | 1 | leader only | 2162 | 214 | 0.52 | 0.06 |
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| 256 | 64 | leader only | 14789 | 792 | 7.69| 0.48 |
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| 256 | 256 | leader only | 14424 | 512 | 29.92 | 1.42 |
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| 64 | 64 | all servers | 45752 | 2048 | 2.47 | 0.14 |
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| 64 | 256 | all servers | 46592 | 1273 | 10.14 | 0.59 |
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| 256 | 64 | all servers | 45332 | 1847 | 2.48| 0.12 |
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| 256 | 256 | all servers | 46485 | 1340 | 10.18 | 0.74 |
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### Single Key Write Performance
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| key size in bytes | number of clients | target etcd server | average write QPS | write QPS stddev | average 90th Percentile Latency (ms) | latency stddev |
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|-------------------|-------------------|--------------------|------------------|-----------------|--------------------------------------|----------------|
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| 64 | 1 | leader only | 55 | 4 | 24.51 | 13.26 |
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| 64 | 64 | leader only | 2139 | 125 | 35.23 | 3.40 |
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| 64 | 256 | leader only | 4581 | 581 | 70.53 | 10.22 |
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| 256 | 1 | leader only | 56 | 4 | 22.37| 4.33 |
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| 256 | 64 | leader only | 2052 | 151 | 36.83 | 4.20 |
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| 256 | 256 | leader only | 4442 | 560 | 71.59 | 10.03 |
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| 64 | 64 | all servers | 1625 | 85 | 58.51 | 5.14 |
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| 64 | 256 | all servers | 4461 | 298 | 89.47 | 36.48 |
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| 256 | 64 | all servers | 1599 | 94 | 60.11| 6.43 |
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| 256 | 256 | all servers | 4315 | 193 | 88.98 | 7.01 |
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## Performance Changes
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- Because etcd now records metrics for each API call, read QPS performance seems to see a minor decrease in most scenarios. This minimal performance impact was judged a reasonable investment for the breadth of monitoring and debugging information returned.
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- Write QPS to cluster leaders seems to be increased by a small margin. This is because the main loop and entry apply loops were decoupled in the etcd raft logic, eliminating several blocks between them.
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- Write QPS to all members seems to be increased by a significant margin, because followers now receive the latest commit index sooner, and commit proposals more quickly.
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