JDiskMark v0.6.2 beta (Windows/Mac/Linux)

Java Disk Benchmark Utility

Features

• Java cross platform solution
• Benchmark IO read/write performance
• Graphs: sample bw, max, min, cum bw, latency (access time)
• Adjustable block size, block qty and sample qty
• Single or multi file option
• Sequential or random option
• Detect drive model, capacity and processor
• Save and load benchmark
• Auto clear disk cache (when sudo or admin)
• multi threaded benchmarks

Releases

https://sourceforge.net/projects/jdiskmark/

Installation

Java 21 needs to be installed to run jdiskmark.

1. Download and install java 21 from Oracle.

2. Verify java 21 is installed:

   C:\Users\username>java --version
   java 21.0.1 2023-10-17 LTS
   Java(TM) SE Runtime Environment (build 21.0.1+12-LTS-29)
   Java HotSpot(TM) 64-Bit Server VM (build 21.0.1+12-LTS-29, mixed mode, sharing)
   

3. Extract release zip archive into desired location.

   Examples:  
   /Users/username/jdiskmark-v0.6.0
   /opt/jdiskmark-v0.6.0
   

Launching as normal process

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

Launching gui with elevated privileges

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

command line examples

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: jdm run [-chsv] [-b=<numOfBlocks>] [-e=<exportPath>] [-l=<locationDir>] [-n=<numOfSamples>]
               [-o=<blockSequence>] [-t=<benchmarkType>] [-T=<numOfThreads>] [-z=<blockSizeKb>]
Starts a disk benchmark test with specified parameters.
  -b, --blocks=<numOfBlocks>
                  Number of blocks/chunks per sample. (Default: 32)
  -c, --clean     Remove existing JDiskMark data directory before starting.
  -e, --export=<exportPath>
                  The output file to export benchmark results in json format.
  -h, --help      Display this help and exit.
  -l, --location=<locationDir>
                  The directory path where test files will be created.
  -n, --samples=<numOfSamples>
                  Total number of samples/files to write/read. (Default: 200)
  -o, --order=<blockSequence>
                  Block order: Sequential, Random. (Default: SEQUENTIAL)
  -s, --save      Enable saving the benchmark.
  -t, --type=<benchmarkType>
                  Benchmark type: Read, Write, Read & Write. (Default: WRITE)
  -T, --threads=<numOfThreads>
                  Number of threads to use for testing. (Default: 1)
  -v, --verbose   Enable detailed logging.
  -z, --block-size=<blockSizeKb>
                  Size of a block/chunk in Kilobytes (KB). (Default: 512)

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"

run example benchmark

java -jar jdiskmark.jar run -n 25 -o Random -t "Write" -T 4
...
-------------------------------------------
JDiskMark Benchmark Results (v0.6.3-dev)
-------------------------------------------
Benchmark: Write
Drive: Samsung SSD 990 PRO 4TB
Capacity: 32% (1178/3725 GB)
Timestamp: 2025-10-26T18:17:37.529141200
CPU: 13th Gen Intel(R) Core(TM) i9-13900K
System: Windows 11 / amd64
Java: Java(TM) SE Runtime Environment 21.0.3
Path: C:\Users\james
-------------------------------------------
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
-------------------------------------------

Development Environment

jdiskmark client is developed with NetBeans 21 and Java 21

Source

Source is available on our github repo

Release Notes

v1.0.0 planned

• TODO: #16 MacOS installer - tyler
• TODO: #15 Ubuntu installer - jeff
• TODO: #70 app icon - ian
• TODO: #33 maven build - lane
• TODO: #40 gui presentation issues - james
• TODO: #78 throttle graphics render - valerio
• TODO: #69 command line support - james
• #84 processor info resolved for (sp) installs
• #73 refactor benchmark data model, keyboard op sel

v0.6.2 linux optimized ui

• #64 persist IOPS, write sync - val
• control panel on left
• allow concurrent version runs
• event tab swapped w disk location

v0.6.1 ms app store release

• JDiskMark in title and msi vendor name
• Remove "Average" from "Access Time" label

v0.6.0

• #13 Detect drive info on startup
• #12 update look and feel (windows)
• #22 foreign capacity reporting
• #23 delete selected benchmarks
• #10 IOPS reporting
• #25 linux crash, capacity w terabytes and exabytes
• write sync default off
• #26 lowercase project and jar
• #20 threading and queue depth
• #36 I/O Mode dropdown uses enum values for type safety

v0.5.1

• resolve #17 invalid disk usage reported win 10
• msi installer available

v0.5

• update for java 21 LTS w NetBeans 20 environment: eclipselink 4.0, jpa 3.1, modelgen 5.6, annotations 3.1, xml.bind 4.0
• increased drive information default col width to 170
• time format updated to yyyy-MM-dd HH:mm:ss
• default to 200 marks
• replace Date w LocalDateTime to avoid deprecated @Temporal
• disk access time (ms) - plotting disabled by default
• replace display of transfer size with access time in run panel
• GH-2 auto clear disk cache for combined write read benchmarks
• GH-6 save and load benchmarks and graph series
• break out actions into seperate menu
• admin or root indicator, architecture indicator
• GH-8 used capacity and total capacity
• initial color palette options
• report processor name

v0.4

• updated eclipselink to 2.6 allows auto schema update
• improved gui initialization
• platform disk model info:
  • windows: via powershell query
  • linux: via df /data/path & lsblk /dev/path --output MODEL
  • osx: via df /data/path & diskutil info /dev/disk1

v0.3

• persist recent run with embedded derby db
• remove "transfer mark number" from graph
• changed graph background to dark gray
• resizing main frame stretches tabbed pane instead of empty panel

v0.2

• auto generate zip release ie. jdiskmark-v0.2.zip
• added tabbed pane near bottom to organize new controls
• format excessive decimal places
• show recent runs (not persisted)
• default to nimbus look and feel

v0.1

• initial release

Proposed Features

• upload benchmarks to jdiskmark.net portal (anonymous/w login)
• local app log for remote diagnostics
• selecting a drive location displays detected drive information below
• speed curves w rw at different tx sizes
• response time histogram > distribution of IO
• IOPS charts, review potential charts
• help that describes features and controls

issues

• read&write not consistant with order caps
• bottom margins between table to bar to window edge should be the same

Windows Paths Examples for Building

For ant builds

C:\apache-ant-1.10.15\bin

For maven builds

C:\apache-maven-3.9.10\bin

For code signing

C:\Program Files (x86)\Windows Kits\10\bin\10.0.26100.0\x86\