Native Operating System and Hardware Information
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OSHI is a free JNA-based (native) Operating System and Hardware Information library for Java. It doesn't require the installation of any additional native libraries and aims to provide a cross-platform implementation to retrieve system information, such as OS version, processes, memory & CPU usage, disks & partitions, devices, sensors, etc.

OSHI provides lightweight Java objects to enable the core functionality in the oshi-core module, and extends that with flexible, configurable JSON-formatted data in the oshi-json module.

Supported platforms

Windows • Linux • Mac OS X • Unix (Solaris, FreeBSD)

Supported features

  • Computer System and firmware, baseboard
  • Operating System and Version/Build
  • Physical (core) and Logical (hyperthreaded) CPUs
  • System and per-processor load % and tick counters
  • CPU uptime, processes, and threads
  • Process uptime, cpu, memory usage
  • Physical and virtual memory used/available
  • Mounted filesystems (type, usable and total space)
  • Disk drives (model, serial, size) and partitions
  • Network interfaces (IPs, bandwidth in/out)
  • Battery state (% capacity, time remaining)
  • Connected displays (with EDID info)
  • USB Devices
  • Sensors (temperature, fan speeds, voltage)



Stable Release Version Current Development Version Dependencies
oshi-core-3.4.4 oshi-core-3.5.0-SNAPSHOT JNASLF4Jthreetenbp
oshi-json-3.4.4 oshi-json-3.5.0-SNAPSHOT javax.json

Projects using OSHI


OSHI provides output directly via java methods or, for the oshi-json project, in JSON format for each of its interfaces. By periodically polling dynamic information (e.g., every second), users can calculate and track changes.

The main() method of SystemInfoTest provides sample code demonstrating the use of oshi-core interfaces to retrieve information and calculate additional metrics such as the below examples.

For oshi-json, SystemInfoTest enables the same capabilities via decorator classes. See for a sample properties configuration file to customize JSON results.

General information about the operating system and computer system.

Apple macOS 10.12.3 (Sierra) build 16D32
manufacturer: Apple Inc.
model: MacBook Pro (MacBookPro8,2)
serialnumber: C02FG6XYDF71

Processor identification.

Intel(R) Core(TM)2 Duo CPU T7300  @ 2.00GHz
 4 physical CPU(s)
 8 logical CPU(s)
Identifier: Intel64 Family 6 Model 42 Stepping 7
ProcessorID: BFEBFBFF000206A7

By measuring ticks (user, nice, system, idle, iowait, and irq) between time intervals, percent usage can be calculated. Java MXBean and per-processor information is also provided.

CPU, IOWait, and IRQ ticks @ 0 sec:[967282, 15484, 195343, 124216619], 6176, [4054, 2702]
CPU, IOWait, and IRQ ticks @ 1 sec:[967308, 15484, 195346, 124216790], 6177, [4057, 2705]
User: 13.0% Nice: 0.0% System: 1.5% Idle: 85.5%
CPU load: 8.8% (counting ticks)
CPU load: 9.0% (OS MXBean)
CPU load averages: 2.69 2.47 2.38
CPU load per processor: 23.6% 1.3% 18.2% 0.7% 12.9% 0.7% 12.1% 1.3%

Process information including CPU and memory per process is available.

Processes: 401, Threads: 1159
   PID  %CPU %MEM       VSZ       RSS Name
 55977  27.9  0.2   6.8 GiB  34.3 MiB java
 51820  18.7  5.6   6.3 GiB 919.2 MiB eclipse
 39272  11.2 17.8   7.1 GiB   2.8 GiB prl_vm_app
 85316   6.5  2.9   5.6 GiB 471.4 MiB thunderbird
 35301   5.4  0.5   1.7 GiB  89.8 MiB Microsoft Excel

Memory and swapfile information is available.

Memory: 2.9 GiB/16 GiB
Swap used: 90.8 MiB/1 GiB

The EDID for each Display is provided. This can be parsed with various utilities for detailed information. OSHI provides a summary of selected data.

 Display 0:
  Manuf. ID=SAM, Product ID=2ad, Analog, Serial=HA19, ManufDate=3/2008, EDID v1.3
  41 x 27 cm (16.1 x 10.6 in)
  Preferred Timing: Clock 106MHz, Active Pixels 3840x2880 
  Range Limits: Field Rate 56-75 Hz vertical, 30-81 Hz horizontal, Max clock: 140 MHz
  Monitor Name: SyncMaster
  Serial Number: H9FQ345476
 Display 1:
  Manuf. ID=SAM, Product ID=226, Analog, Serial=HA19, ManufDate=4/2007, EDID v1.3
  41 x 26 cm (16.1 x 10.2 in)
  Preferred Timing: Clock 106MHz, Active Pixels 3840x2880 
  Range Limits: Field Rate 56-75 Hz vertical, 30-81 Hz horizontal, Max clock: 140 MHz
  Monitor Name: SyncMaster
  Serial Number: HMCP431880

Disks and usage (reads, writes, transfer times) are shown, and partitions can be mapped to filesystems.

 disk0: (model: SanDisk Ultra II 960GB - S/N: 161008800550) size: 960.2 GB, reads: 1053132 (23.0 GiB), writes: 243792 (11.1 GiB), xfer: 73424854 ms
 |-- disk0s1: EFI (EFI System Partition) Maj:Min=1:1, size: 209.7 MB
 |-- disk0s2: Macintosh HD (Macintosh SSD) Maj:Min=1:2, size: 959.3 GB @ /
 disk1: (model: Disk Image - S/N: ) size: 960.0 GB, reads: 3678 (60.0 MiB), writes: 281 (8.6 MiB), xfer: 213627 ms
 |-- disk1s1: EFI (EFI System Partition) Maj:Min=1:4, size: 209.7 MB
 |-- disk1s2: Dropbox (disk image) Maj:Min=1:5, size: 959.7 GB @ /Volumes/Dropbox

Sensor readings are available for some hardware (see notes in the FAQ).

 CPU Temperature: 69.8°C
 Fan Speeds:[4685, 4687]
 CPU Voltage: 3.9V

Attached USB devices can be listed:

USB Devices:
 |-- Root Hub Simulation Simulation (Apple Inc.)
     |-- IOUSBHostDevice
         |-- IR Receiver (Apple Computer, Inc.)
         |-- USB Receiver (Logitech)
 |-- Root Hub Simulation Simulation (Apple Inc.)
     |-- FaceTime HD Camera (Built-in) (Apple Inc.) [s/n: DJHB1V077FDH5HL0]
     |-- IOUSBHostDevice
         |-- Apple Internal Keyboard / Trackpad (Apple Inc.)
         |-- BRCM2070 Hub (Apple Inc.)
             |-- Bluetooth USB Host Controller (Apple Inc.)
 |-- Root Hub Simulation Simulation (Apple Inc.)
     |-- IOUSBHostDevice
         |-- Apple Thunderbolt Display (Apple Inc.) [s/n: 162C0C25]
         |-- Display Audio (Apple Inc.) [s/n: 162C0C25]
         |-- FaceTime HD Camera (Display) (Apple Inc.) [s/n: CCGCAN000TDJ7DFX]
         |-- USB2.0 Hub
             |-- ANT USBStick2 (Dynastream Innovations) [s/n: 051]
             |-- Fitbit Base Station (Fitbit Inc.)

You can run the SystemInfoTest and see the full output for your system by cloning the project and building it with Maven.

git clone && cd oshi

mvn test-compile -pl oshi-core -q exec:java \
  -Dexec.mainClass="oshi.SystemInfoTest" \

Where are we?

OSHI originated as a platform-independent library that did not require additional software and had a license compatible with both open source and commercial products. We've developed a strong core of features on major Operating Systems, but we would love you to help by:

  • Testing! Download and test the program on different software and hardware and help identify gaps that our limited development and testing may have missed.
  • Contributing ports. Have an OS that's not covered? It's likely one of the existing ports can be slightly modified.
  • Contributing code. See something that's not working right or could work better? Help us fix it! New contributors welcome.
  • Documenting implementation. Our Wiki is blank. Want to help new users follow in your footsteps?
  • Suggesting new features. Do you need OSHI to do something it doesn't currently do? Let us know.

How is this different from ...

  • Sigar:
    • Sigar uses JNI which requires a native DLL to be installed. OSHI uses JNA and doesn't require a native DLL to be installed.
    • Sigar is licensed under Apache 2.0 license. OSHI is distributed under the EPL license.
    • The last stable release of Sigar (1.6.4) was in 2010. OSHI is under active development as-of 2017.
  • jHardware:
    • jHardware does not require JNA but instead uses command-line parsing and has a limited set of features. OSHI integrates more native code through JNA and supports more platforms and more features.
    • jHardware presently only supports Windows and *Nix systems.
  • OperatingSystemMXBean
    • The MXBean may not be available in non-Oracle JVMs.
    • The MXBean has very few methods that address system-wide statistics.
    • OSHI provides significantly more information than the OperatingSystemMXBean.


This project is licensed under the Eclipse Public License 1.0.