ZBDBench: Benchmark Suite for ZNS SSDs and SMR HDDs

ZBDBench is a collection of benchmarks for zoned storage devices that tests both the raw performance of the device, and runs standard benchmarks for applications such as RocksDB (dbbench) and MySQL (sysbench).

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Getting Started

The run.py script runs a set of predefined benchmarks on a block device. Required dependencies are described at the bottom.

The block device does not have to be zoned - the workloads will work on both types of block devices.

The script performs a set of checks before running the benchmarks, such as validating that it is about to write to a block device, not mounted, and ready.

After all benchmarks have run, their output is availble in:

output/YYYYMMDDHHMMSS (date format is replaced with the current time)

Each benchmark has a report function, which creates a csv file with the specific output. See the section below for the csv format for each benchmark.

To execute the benchmarks, run:

sudo ./run.py -d /dev/nvmeXnY

If you have the latest fio installed, you may skip the docker installation and run the benchmarks using the system commands.

sudo ./run.py -d /dev/nvmeXnY -c system

To list available benchmarks, run:

./run.py -l

To only run a specific benchmark, append -b <benchmark_name> to the command:

sudo ./run.py -d /dev/nvmeXnY -b fio_zone_mixed

Command Options

List available benchmarks:

./run.py -l

Run specific benchmark:

./run.py -b benchmark -d /dev/nvmeXnY

Run all benchmarks:

./run.py -d /dev/nvmeXnY

Regenerate a report (and its plots)

./run.py -b fio_zone_mixed -r output/YYYYMMDDHHMMSS

Regenerate plots from existing csv report

./run.py -b fio_zone_throughput_avg_lat -p output/YYYYMMDDHHMMSS/fio_zone_throughput_avg_lat.csv

Benchmarks

fio_zone_write

• executes a fio workload that writes sequential to 14 zones in parallel and while writing 6 times the capacity of the device.

• generated csv output (fio_zone_write.csv)

  1. written_gb: gigabytes written (GB)
  2. write_avg_mbs: average throughput (MB/s)

fio_zone_mixed

• executes a fio workload that first preconditions the block device to steady state. Then rate limited writes are issued, in which 4KB random reads are issued in parallel. The average latency for the 4KB random read is reported.

• generated csv output (fio_zone_mixed.csv)

  1. write_avg_mbs_target: target write throughput (MB/s)
  2. read_lat_avg_us: avg 4KB random read latency (us)
  3. write_avg_mbs: write throughput (MB/s)
  4. read_lat_us_avg_measured: avg 4KB random read latency (us)
  5. clat_*_us: Latency percentiles

  ** Note that (2) is only reported if write_avg_mbs_target and write_avg_mbs are equal. When they are not equal, the reported average latency is misleading, as the write throughput requested has not been possible to achieve.

fio_zone_randr_seqw_seqr_rrsw

• executes a fio workload that first preconditions the block device to steady state. Then it executes the following workloads:

  1. 4K_R_READ_256QD: Runs a random read workload with bs=4K, QD 256.
  2. 128K_S_READ_QD64: Runs a seq read workload with bs=128K, QD 64.
  3. 128K_70-30_R_READ_S_WRITE_QD64: Runs a rand read and seq write workload with QD 64.
  4. 128KB_S_WRITE_QD64: Runs a seq write workload with bs=128K, QD 64.

• generated csv output file is fio_zone_randr_seqw_seqr_rrsw.csv

  1. read_avg_mbs: Avg read bw in mbs, 0 if no reads in the workload.
  2. read_lat_avg_us: Avg read latency in micro seconds.
  3. write_avg_mbs: Avg write bw in mbs, 0 if no writes in the workload.
  4. write_lat_avg_us: Avg write latency in micro seconds.
  5. read_iops: Read IOPS for a workload involving reads, else 0.
  6. write_iops: Write IOPS for a workload involving writes, else 0.
  7. clat_*_us: Latency percentiles

  *NOTE: For workload 3, the read and write percentiles are reported seperately in 2 lines in the csv.

fio_zone_throughput_avg_lat

• Executes all combinations of the following workloads twice and averages the throughput and latency in the csv report:

  • Read/write
  • Seq/Random
  • BS: 4K, 8K, 16K, 64K, 128K
  • max_open_zone: 1, 2, 4, 8, 12 (only for writes)
  • QD: 1, 2, 4, 8 (skipping QD's > max_open_zones)

  For reads the drive is prepared with a write. The ZBD is reset before each run.

• Generated csv output file is fio_zone_throughput_avg_lat.csv

  1. avg_lat_us: Average latency in µs for the specific run.
  2. throughput_MiBs: Throughput in MiBs for the specific run.
  3. clat_p1_us - clat_p100us: completion latency percentiles in µs.

• Generates multiple graphs that plot the behavior of throughput and latency.

Dependencies

The benchmark tool requires Python 3.4+. In addition to a working python environment, the script requires the following installed:

• Linux kernel 5.9 or newer

  • Check your loaded kernel version using: uname -a

• nvme-cli (apt-get install nvme-cli)

  • Ubuntu: sudo apt-get install nvme-cli
  • Fedora: sudo dnf -y install nvme-cli

• blkzone (available through util-linux)

  • Ubuntu: sudo apt-get install util-linux
  • Fedora: sudo dnf -y install util-linux-ng
  • CentOS: sudo yum -y install util-linux-ng

• a valid docker environment

  • If you do not have a docker environment installed, please see:
    • Ubuntu: https://docs.docker.com/engine/install/ubuntu/
    • Fedora: https://docs.docker.com/engine/install/fedora/
    • Centos: https://docs.docker.com/engine/install/centos/

• installed docker containers:

  • zfio - contains latest fio compiled with zone capacity support
  • zrocksdb - contains rocksdb with zenfs built-in
  • zzenfs - contains the zenfs tool to inspect the zenfs file-system

  The container can be installed with: cd recipes/docker; sudo ./build.sh

  The container installation can be verified by listing the docker image: sudo docker images zfio sudo docker images zrocksdb sudo docker images zzenfs

• matplotlib (e.g. through pip3) https://matplotlib.org/stable/users/installing.html