Test Method

Test Environment

• Region: CN-Hong Kong
• AZ: AZ1
• Elastic Cloud Server (ECS): s3.2xlarge.2 flavor with 8 vCPUs, 16 GB of memory, and CentOS 7.5 64-bit image
• Replica set specifications: All specifications described in Table 1

  Table 1 Replica set specifications

  Replica Set No.	DB Version	Specifications
  Replica set 1	4.0	4 vCPUs | 16 GB
  Replica set 2	4.0	8 vCPUs | 32 GB
  Replica set 3	4.0	16 vCPUs | 64 GB
  Replica set 4	4.0	32 vCPUs | 128 GB

Test Tools

YCSB is an open-source tool for testing performance of databases. In this test, YCSB 0.12.0 is used.

For details on how to use this tool, see YCSB.

Test Metrics

Operations per Second (OPS): operations executed by a database per second

Test Procedure

1. Configure the workload file.

   Set values for fields readproportion, insertproportion, and updateproportion in the workload file by referring to Table 2.

   Set a value for field recordcount in the workload file by referring to Table 3.

2. Use workload_s1 as an example. Run the following command to prepare test data:

   ./bin/ycsb load mongodb -s -P workloads/workload_s1 -p mongodb.url=mongodb://${userName}:${password}@${mongodIP}:${port},${mongodIP}:${port},${mongodIP}:${port}/ycsb?authSource=admin&replicaSet=replica&readPreference=secondary -threads ${threadNum} 1>workload_s1_load.result 2> workload_s1_load.log

3. Run the following command to test performance:

   ./bin/ycsb run mongodb -s -P workloads/workload_s1 -p mongodb.url=mongodb://${userName}:${password}@${mongodIP}:${port},${mongodIP}:${port},${mongodIP}:${port}/ycsb?authSource=admin&replicaSet=replica&readPreference=secondary -threads ${threadNum} -p maxexecutiontime=1800 1>workload_s1_run.result 2> workload_s1_run.log

   

   • ${mongodIP} indicates private IP addresses of primary and secondary nodes in the GeminiDB Mongo replica set.
   • ${password} is the administrator password of the GeminiDB Mongo replica set.
   • ${threadNum} indicates concurrent threads for running the test. In this test, the number of concurrent threads is 128.

Test Models

• Workload model

  Table 2 Service models

  No.	Service Model
  S1	100% insert
  S2	90% update ,10% read
  S3	65% read ,25% insert, 10% update
  S4	90% read ,5% insert, 5% update
  S5	50% update, 50% read
  S6	100% read

• Concurrent threads: 128

• Document model

  Use the default settings of YCSB: The size of each document is 1 KB, and the default index is _id.

• Preset data volume

  Two types of preset data volumes were used to test performance of replica sets of each type of specifications.

  The following table describes preset data volumes for different replica set specifications.

  Table 3 Preset data volumes

  Replica Set No.	Specifications	Small Data Volume	Large Data Volume
  Replica set 1	4 vCPUs | 16 GB	Storage space: 10 GB RecordCount: 10000000	Storage space: 100 GB Record counts: 100000000
  Replica set 2	8 vCPUs | 32 GB	Storage space: 10 GB RecordCount: 10000000	Storage space: 100 GB RecordCount: 100000000
  Replica set 3	16 vCPUs | 64 GB	Storage space: 10 GB RecordCount: 10000000	Storage space: 100 GB RecordCount: 100000000
  Replica set 4	32 vCPUs | 128 GB	Storage space: 10 GB RecordCount: 10000000	Storage space: 100 GB RecordCount: 100000000

• Data consistency model

  Weak consistency: If Write Concern is set to {w : 1, j : false}, a response is returned after data is written to disks on a single node. If the default setting is kept Write Concern, data is asynchronously stored on disks.