Project: JuiceFS (Runtime / Cloud Native Storage)
File: mdtest.md

title: Benchmark with mdtest sidebar_position: 8 slug: /mdtest :::tip Trash is enabled in JuiceFS v1.0+ by default. As a result, temporary files are created and deleted in the file system during the benchmark, and these files will be eventually dumped into a directory named `.trash`. To avoid storage space being occupied by `.trash`, you can run command `juicefs config META-URL --trash-days 0` to disable Trash before benchmark. See for details. ::: Perform a metadata test on JuiceFS, and with . The following tests are performed with `mdtest` 3.4. The arguments of `mdtest` are tuned to ensure that the command will finish within 5 minutes. ``` ./mdtest -d /s3fs/mdtest -b 6 -I 8 -z 2 ./mdtest -d /efs/mdtest -b 6 -I 8 -z 4 ./mdtest -d /jfs/mdtest -b 6 -I 8 -z 4 ``` All the following tests are performed using `mdtest` on a c5.large EC2 instance (2 CPU, 4G RAM) with Ubuntu 18.04 LTS (Kernel 5.4.0) operating system. The Redis (version 4.0.9) which JuiceFS uses runs on a c5.large EC2 instance in the same available zone to store metadata. JuiceFS mount command: ``` ./juicefs format --storage=s3 --bucket=https://<BUCKET>.s3.<REGION>.amazonaws.com localhost benchmark nohup ./juicefs mount localhost /jfs & ``` EFS mount command (the same as the configuration page): ``` mount -t nfs -o nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport, <EFS-ID>.efs.<REGION>.amazonaws.com:/ /efs ``` S3FS (version 1.82) mount command: ``` s3fs <BUCKET>:/s3fs /s3fs -o host=https://s3.<REGION>.amazonaws.com,endpoint=<REGION>,passwd_file=${HOME}/.passwd-s3fs ``` ``` mdtest-3.4.0+dev was launched with 1 total task(s) on 1 node(s) Command line used: ./mdtest '-d' '/s3fs/mdtest' '-b' '6' '-I' '8' '-z' '2' WARNING: Read bytes is 0, thus, a read test will actually just open/close. Path : /s3fs/mdtest FS : 256.0 TiB Used FS: 0.0% Inodes: 0.0 Mi Used Inodes: -nan% Nodemap: 1 1 tasks, 344 files/directories SUMMARY rate: (of 1 iterations) Operation Max Min Mean Std Dev - Directory creation : 5.977 5.977 5.977 0.000 Directory stat : 435.898 435.898 435.898 0.000 Directory removal : 8.969

8.969 0.000 File creation : 5.696 5.696 5.696 0.000 File stat : 68.692 68.692 68.692 0.000 File read : 33.931 33.931 33.931 0.000 File removal : 23.658 23.658 23.658 0.000 Tree creation : 5.951 5.951 5.951 0.000 Tree removal : 9.889 9.889 9.889 0.000 ``` ``` mdtest-3.4.0+dev was launched with 1 total task(s) on 1 node(s) Command line used: ./mdtest '-d' '/efs/mdtest' '-b' '6' '-I' '8' '-z' '4' WARNING: Read bytes is 0, thus, a read test will actually just open/close. Path : /efs/mdtest FS : 8388608.0 TiB Used FS: 0.0% Inodes: 0.0 Mi Used Inodes: -nan% Nodemap: 1 1 tasks, 12440 files/directories SUMMARY rate: (of 1 iterations) Operation Max Min Mean Std Dev - Directory creation : 192.301 192.301 192.301 0.000 Directory stat : 1311.166 1311.166 1311.166 0.000 Directory removal : 213.132 213.132 213.132 0.000 File creation : 179.293 179.293 179.293 0.000 File stat : 915.230 915.230 915.230 0.000 File read : 371.012 371.012 371.012 0.000 File removal : 217.498 217.498 217.498 0.000 Tree creation : 187.906 187.906 187.906 0.000 Tree removal : 218.357 218.357 218.357 0.000 ``` ``` mdtest-3.4.0+dev was launched with 1 total task(s) on 1 node(s) Command line used: ./mdtest '-d' '/jfs/mdtest' '-b' '6' '-I' '8' '-z' '4' WARNING: Read bytes is 0, thus, a read test will actually just open/close. Path : /jfs/mdtest FS : 1024.0 TiB Used FS: 0.0% Inodes: 10.0 Mi Used Inodes: 0.0% Nodemap: 1 1 tasks, 12440 files/directories SUMMARY rate: (of 1 iterations) Operation Max Min Mean Std Dev - Directory creation : 1416.582 1416.582 1416.582 0.000 Directory stat : 3810.083 3810.083 3810.083 0.000 Directory removal : 1115.108 1115.108 1115.108 0.000 File creation : 1410.288 1410.288 1410.288 0.000 File stat : 5023.227 5023.227 5023.227 0.000 File read : 3487.947 3487.947 3487.947 0.000 File removal : 1163.371 1163.371 1163.371 0.000 Tree creation : 1503.004 1503.004 1503.004 0.000 Tree removal : 1119.806 1119.806 1119.806 0.000 ```