JBenchmark ACE (ARM CPU Estimator) - JBenchmark ARM CPU Estimator gauges the generation of processor and clock frequency of mobile phones with unique Java-based software.
JBenchmark ACE software is free to download and once started, reveals the type of processor, clock speed and profiles the Java Virtual Machine (VM) used in that mobile device. Besides supporting Mobile Information Device Profile (MIDP) Java environments, the JBenchmark ACE also supports the DoJa platform developed by DoCoMo and used by millions of phones in Asia and Europe.
Estimation Methodology
The JBenchmark ACE can identify all major ARM processor generations, including the ARM7, ARM9 and latest ARM11 processor families. Each ARM processor class has different performance profiles and differing range of clock rates which are all reported back by the JBenchmark ACE. Using the JBenchmark ACE, it is possible to see that the ARM11 processor family is being used in the newest most powerful mobile devices, including the Nokia N93, which was voted the European Media Phone of the Year 2006-2007 by the European Imaging and Sound Association (EISA), Europe's largest multimedia press organization. Similarly, it is evident that the ARM7 processor family is still favored for voice-centric phones.
As there are no native Java methods to obtain information regarding an embedded processor, the JBenchmark ACE uses innovative measurements, statistical methods and a database of benchmarked devices to get a precise estimation of the underlying processor class and clock frequency. Each result is classified and compared to all results held in the database to make sure the estimation is realistic. In addition, the ACE adaptive estimator engine improves automatically upon conducting each measurement, which increases the precision of the future results.
Accuracy and Transparency
The JBenchmark ACE also creates a very detailed profile on the Java VM, based on distinct groups of Java acceleration strategies such as: just in time compilers (JIT), ahead of time compilers (AOT), interpreted VMs and hardware accelerated VMs such as ARM Jazelle technology. Knowing the Java VM used by the mobile device greatly enhances the estimation precision and also provides users with the context for the performance results.
The JBenchmark ACE targets 90 percent accuracy, meaning that more than 90 percent of the processor clock frequencies are estimated correctly to within 10 percent margin of error.
JBenchmark ACE estimations are based on two components:
- The JBenchmark ACE client application runs on the mobile device, collects raw measurement data and sends it back to the server for calculating the final results, which are reported back to the user.
- The JBenchmark ACE server-side engine estimates the final results based on the raw data received from clients. The engine updates itself automatically with every new result received to increase precision.
The JBenchmark ACE database already contains more than 250 tested devices and new results are automatically added into the database. Virtually any Java-enabled mobile device can be tested and added to the database through the freely available JBenchmark ACE client application from: www.jbenchmark.com/ace.
Usage
After successful installation, you can start doing measurements by opening "JBenchmark ACE" application and pushing the "Start" menu button.
After that JBenchmark ACE will start collecting raw data about your CPU and VM. This will take usually 1 to 5 minutes, while you have to wait patiently. (Pushing the buttons during this stage will distort final results.)
To get the CPU and VM estimations, JBenchmark ACE needs to send the raw data it has collected to JBenchmark.com servers which will calculate the final results using sophisticated statistical methods.
Warning: To be able to send (and receive) data from our servers you'll need to have an active network connection on your device as well as your login and password of your JBenchmark Community Membership account.
Brief explanations of the estimated properties
CPU class and clock rate
Most mobile devices use derivatives of ARM CPUs, which can be grouped in three main classes: ARM7, ARM9 and ARM11.
As the class names indicate, ARM11s (250 MHz+) are usually faster than ARM9s (100 MHz+) and ARM7s (40-80 MHz). The big exceptions are XScale CPUs from Intel, which are relatives of ARM9 running at high (200-600 MHz) clock rates.
JBenchmark ACE has been successfully tested with 40 to 400 MHz CPUs.
Compiler VMs
Java Virtual Machines (VM) are used to run Java programs in mobile phones.
Some VMs compile big chunks of Java bytecodes into native CPU instructions before running them. These are the so-called compiler VMs.
These VMs use more memory and usually reach higher peek performance compared to non-compiler VMs.
(Non compiling VMs interpret Java bytecodes sequentially as they are running the applications. These interpreter VMs need very small memory footprint and are typically used in older and/or more limited devices.)
Jazelle acceleration
Jazelle is a hardware acceleration technology for Java execution on select ARM CPUs. These microprocessors run most of the Java bytecodes natively, ie. without the need to compile/interpret the Java bytecodes into ARM specific intstructions.
Jazelle enabled VMs can achieve similar performance to compiler VMs using small memory footprint.
About ARM
According to the latest figures, virtually all mobile phones use at least one ARM-designed processor. JBenchmark ACE targets and identifies all major ARM core families: ARM7, ARM9 and the latest ARM11 line of CPUs.
Each ARM processor class has different performance profile and differing range of clock rates which are reported back by JBenchmark ACE.
· Estimates CPU clock speed in MHz
· Classifies CPU core generations (ARM7, ARM9, ARM11)
· Groups Java Virtual Machines (VM) by acceleration technology (AOT, Jazelle, JIT)
· Based on statistic analysis of thousands of peformance results
· Supports MIDP and DoJa (Japan) phones
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Requirements:Java enabled phone
Supported operating systems:
Java ME, Java Nokia 240x320, Java SE 240x320
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