Java Disk Benchmark Utility — cross-platform disk I/O performance testing for Windows, macOS and Linux.

• Java cross platform solution
• Benchmark IO read/write performance
• Graphs: sample bw, max, min, cum bw, latency (access time)
• Configure block size, blocks, samples and other benchmark parameters
• Detect drive model, capacity and processor
• Save and load benchmark
• Auto clear disk cache (when sudo or admin)
• multi threaded benchmarks
• Default profiles
• Command line interface
• Installers for msi, pkg, deb, rpm and flatpak

See CHANGELOG.md for the full version history.

Installers and archives can be found on sourceforge

A signed windows installer is available for windows environment and can be installed as an administrator.

To install launch the jdiskmark-<version>.msi.

The deb installer is used on Debian linux distributions like ubuntu.

To install use sudo dpkg -i jdiskmark_<version>_amd64.deb and to remove sudo dpkg -r jdiskmark

The rpm installer is used on RHEL, CENTOS, SUSELinux and Fedora distributions.

To install use sudo rpm -i jdiskmark-<rpm.version>.x86_64.rpm and to remove use sudo rpm -e jdiskmark

Note: the rpm.version is similar to the version but replaces hyphens with periods.

Download the jdiskmark-<version>.pkg and double-click to launch the installer. JDiskMark will be installed to /Applications/JDiskMark.app.

Because JDiskMark is not yet notarized with Apple, macOS will block the first launch. To allow it:

1. Open System Settings → Privacy & Security
2. Scroll down to the Security section — you will see a message that JDiskMark was blocked
3. Click Open Anyway

JDiskMark registers with macOS's package manager (pkgutil) during install, so it can be cleanly removed without leaving behind stale entries.

# Remove the application bundle
sudo rm -rf /Applications/JDiskMark.app

# Forget the package receipt so macOS no longer tracks it
sudo pkgutil --forget net.jdiskmark.JDiskMark

The flatpak installer is a universal linux package that can be used on many distributions. Some gaming-oriented distros such as Bazzite or SteamOS have Flatpak and Flathub pre-configured.

flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

JDiskMark depends on the org.freedesktop.Platform 25.08 runtime. Install it from Flathub:

flatpak install --user flathub org.freedesktop.Platform//25.08

Download the jdiskmark-<version>.flatpak bundle and run:

flatpak install --user ./jdiskmark-<version>.flatpak

Launch JDiskMark from your application menu or the terminal:

flatpak run net.jdiskmark.JDiskMark

flatpak uninstall net.jdiskmark.JDiskMark

Note: The zip distribution is currently disabled in the build pipeline and is planned for restoration in a future release. It is intended as a portable, no-install option — ideal for running from a USB drive on systems where admin rights are not available (e.g. PC repair shops).

The zip distribution does not require admin for installing but does require Java 25 to be installed separately.

1. Download and install Java 25 from Oracle.

2. Verify Java 25 is installed:

   C:\Users\username>java --version
   java 25.0.1 2025-10-21 LTS
   Java(TM) SE Runtime Environment (build 25.0.1+8-LTS-27)
   Java HotSpot(TM) 64-Bit Server VM (build 25.0.1+8-LTS-27, mixed mode, sharing)
   

3. Extract release zip archive into desired location.

   Examples:
   /Users/username/jdiskmark-<version>
   /opt/jdiskmark-<version>
   

Note: Running without sudo or a windows administrator will require manually clearing the disk write cache before performing read benchmarks.

1. Open a terminal or shell in the extracted directory.

2. run command:

   $ java -jar jdiskmark.jar
   

   In windows double click executable jar file.

3. Drop cache manually:

   • Linux: sudo sh -c "sync; 1 > /proc/sys/vm/drop_caches"
   • Mac OS: sudo sh -c "sync; purge"
   • Windows: Run included EmptyStandbyList.exe or RAMMap64.exe
     • With RAMMap64 invalidate disk cache with Empty > Empty Standby List

Note: Take advantage of automatic clearing of the disk cache for write read benchmarks start with sudo or an administrator windows shell.

• Linux: sudo java -jar jdiskmark.jar
• Mac OS: sudo java -jar jdiskmark.jar
• Windows: start powershell as administrator then java -jar jdiskmark.jar

display version

java -jar jdiskmark.jar -v

display top level help

java -jar jdiskmark.jar -h

display benchmark options

java -jar .\jdiskmark.jar run -h
Usage: jdiskmark run [-cdhmsvy] [-a=<sectorAlignment>] [-b=<numOfBlocks>] [-e=<exportPath>]
                     [-i=<ioEngine>] [-l=<locationDir>] [-n=<numOfSamples>] [-o=<blockSequence>]
                     [-p=<profile>] [-t=<benchmarkType>] [-T=<numOfThreads>] [-z=<blockSizeKb>]
Starts a disk benchmark test with specified parameters.
  -a, --alignment=<sectorAlignment>
                            Sector alignment: NONE, ALIGN_512, ALIGN_4K, ALIGN_8K, ALIGN_16K,
                              ALIGN_64K. (Profile default used if not specified)
  -b, --blocks=<numOfBlocks>
                            Number of blocks/chunks per sample. (Profile default used if not
                              specified)
  -c, --clean               Remove existing JDiskMark data directory before starting.
  -d, --direct              Enable Direct I/O (bypass OS cache). Only works with MODERN engine.
  -e, --export=<exportPath> The output file to export benchmark results in json format.
  -h, --help                Display this help and exit.
  -i, --io-engine=<ioEngine>
                            I/O Engine: MODERN, LEGACY. (Profile default used if not specified)
  -l, --location=<locationDir>
                            The directory path where test files will be created.
  -m, --multi-file          Create a new file for every sample instead of using one large file.
  -n, --samples=<numOfSamples>
                            Total number of samples/files to write/read. (Profile default used if
                              not specified)
  -o, --order=<blockSequence>
                            Block order: SEQUENTIAL, RANDOM. (Profile default used if not specified)
  -p, --profile=<profile>   Profile: QUICK_TEST, MAX_THROUGHPUT, HIGH_LOAD_RANDOM_T32,
                              LOW_LOAD_RANDOM_T1, MAX_WRITE_STRESS, MEDIA_PLAYBACK,
                              VIDEO_EXPORTING, PHOTO_LIBRARY. (Default: QUICK_TEST)
  -s, --save                Enable saving the benchmark results to the database.
  -t, --type=<benchmarkType>
                            Benchmark type: READ, WRITE, READ_WRITE. (Profile default used if not
                              specified)
  -T, --threads=<numOfThreads>
                            Number of threads to use for testing. (Profile default used if not
                              specified)
  -v, --verbose             Enable detailed logging.
  -y, --write-sync          Enable Write Sync (flush to disk).
  -z, --block-size=<blockSizeKb>
                            Size of a block/chunk in Kilobytes (KB). (Profile default used if not
                              specified)

run benchmarks example syntax

java -jar jdiskmark.jar run -n 25 -t "Write"
java -jar jdiskmark.jar run -l D:\ -n 25 -t "Read"
java -jar jdiskmark.jar run -n 25 -t "Read & Write"
java -jar jdiskmark.jar run -p MAX_WRITE_STRESS

run example benchmark

java -jar jdiskmark.jar run -n 25 -o Random -t "Write" -T 4
...
-------------------------------------------
JDiskMark Benchmark Results (v0.8.0)
-------------------------------------------
Benchmark: Write
Drive: Samsung SSD 990 PRO 4TB
Capacity: 32% (1178/3725 GB)
Timestamp: 2026-05-17T05:50:32.000000000
CPU: 13th Gen Intel(R) Core(TM) i9-13900K
System: Windows 11 / amd64
Java: Java(TM) SE Runtime Environment 25.0.1
Path: C:\Users\username
-------------------------------------------
Order: Random
IOMode: Write
Thread(s): 4
Blocks(size): 25(512)
Samples: 25
TxSize(KB): 409600
Speed(MB/s): 3952.64
SpeedMin(MB/s): 3397.24
SpeedMax(MB/s): 4243.47
Latency(ms): 0.13
IOPS: 28892857
-------------------------------------------

JDiskMark is developed with NetBeans 25 and Java 25.

• Java 25 JDK
• Apache Maven 3.9+
• NetBeans 25 (recommended IDE)

1. Run from terminal

# create tag
git tag v0.8.0-tst14

# push tag
git push origin v0.8.0-tst14

2. go to https://github.com/JDiskMark/jdm-java/releases and mark the new tag as a pre-release.

Bug reports and pull requests are welcome on GitHub Issues.

See CONTRIBUTING.md for more details.