Oracle's Java Runtime Environment (JRE) for 64-bit Windows PCs contains the Java Virtual Machine, software libraries, components, and plug-ins that tons of programs, media, and Web sites need to display advanced multimedia content and animation. Version 7 Update 55 of Java's Standard Edition addresses 37 security vulnerabilities while reducing the frequency of security notifications in certain installations.
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Pros:
For example, if you were downloading the Offline JRE Installer for 32-bit systems for update 1.7.0_01, the file name jre-7-windows-i586.exe would become jre-7u1-windows-i586.exe. Similarly, if you were downloading the Offline JRE Installer for 64-bit systems for update 1.7.0_01, the file name jre-7-windows-x64.exe would become: jre-7u1-windows-x64.exe. Main important features for Java JRE 8 Update 191 (64-bit) include: Java JRE 8 Update 191 (64-bit) free and safe to download. Compatible with Windows 10 and other prevoius windows versions. Java JRE 8 Update 191 (64-bit) latest version. 32 bit version works on [64 bit (x64) and 32 bit (x86)] OS. 64 bit works only on 64 bit operaing system. Download Java Runtime Environment (JRE) (64-Bit) for Windows PC 10, 8/8.1, 7, XP. Java Runtime Environment (JRE) (64-Bit) new version for Windows PC. Java Runtime Environment (JRE) (64-Bit) Latest Version setup for Windows 64/32 bit. Java Runtime Environment is a software package that contains what is required to run a Java program.
Answers the 64-bit question: Running 32-bit Java on 64-bit Windows involves compromises, such as Update issues. This version of Java is designed specifically for 64-bit Windows.
Plug-ins: The Java plug-in is critical to many Web applications, while Java Web Start deploys standalone apps over networks.
JavaFX: JRE now includes Java FX version 2.2.55.
Cons:
Security: Some computer experts warn of vulnerabilities in Java that updates have failed to correct.
8 is enough? Java SE 8 is a major update that was released prior to version 7.55's release, though a major security update to version 8 has also been released. Confused? We don't blame you, but Java always bears watching, so check on your system's needs before upgrading.
Bottom Line:
If you're running 64-bit Windows, check your Java version and update it if necessary to JRE SE 7.55 for security and stability.
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I've been using Java for a while now, and my typical ritual of setting up a new dev machine requires the norm of downloading and installing the latest JDK from Oracle's site.
This prompted an unusual question today, does it matter if I use the 32bit or 64bit JRE bundle?
From thinking back on it, I've installed both versions before and my normal toolchain plugs happily in (Eclipse). In my day-to-day programming, I do not recall ever having to change something or think about something in a different way just because I was using the 64bit JRE (or targetting the 64bit JRE for that respect).
From my understanding of 64bit vs. 32bit - it really boils down to how the numbers are stored underneath the covers.. and I do know that int is a 32 bits and long is 64 bits.. same with float being 32 bits and double is 64 bits -- so is it just that Java has abstracted even this subtlety away, and perhaps has been '64 bit compatible' all along?
I'm sure I'm missing something here besides not being able to install a 64 bit JRE onto a 32 bit system.
Peter Cordes5 Answers
64-bit vs. 32-bit really boils down to the size of object references, not the size of numbers.
In 32-bit mode, references are four bytes, allowing the JVM to uniquely address 2^32 bytes of memory. This is the reason 32-bit JVMs are limited to a maximum heap size of 4GB (in reality, the limit is smaller due to other JVM and OS overhead, and differs depending on the OS).
In 64-bit mode, references are (surprise) eight bytes, allowing the JVM to uniquely address 2^64 bytes of memory, which should be enough for anybody. JVM heap sizes (specified with -Xmx) in 64-bit mode can be huge.
But 64-bit mode comes with a cost: references are double the size, increasing memory consumption. This is why Oracle introduced 'Compressed oops'. With compressed oops enabled (which I believe is now the default), object references are shrunk to four bytes, with the caveat that the heap is limited to four billion objects (and 32GB Xmx). Compressed oops are not free: there is a small computational cost to achieve this big reduction in memory consumption.
As a personal preference, I always run the 64-bit JVM at home. The CPU is x64 capable, the OS is too, so I like the JVM to run in 64-bit mode as well.
As you note, primitive numeric types in Java are well-defined.
However, the choice between 32-bit and 64-bit JVMs can matter if your Java application is using native-code libraries, which may be built for use in a 32-bit application, a 64-bit application, or both.
Torrent password recovery bundle 2012 advanced eye. If you have native libraries that support only 32-bit applications, you either need to use a 32-bit JVM, or build 64-bit versions of the libraries.
Andy ThomasAndy ThomasDepending on context, for local development I will always use a 64-bit JDK. Primarily because I would likely need the whole memory space for builds and the IDE.
That being said for integration to production, I would recommend 32-bit if it is possible. Why?
For some Java EE servers that are licensed for production use, it would depend on some factors like which machine how many cores etc. For WebSphere Liberty Profile specifically, you are also limited to 2GB.
64-bit JREs would take up slightly more memory and if you're trying to constrain it to something like 2GB or better yet 2x 1GB cluster you would have more flex space to work around in without paying a cent.
From https://plumbr.eu/blog/java/should-i-use-32-or-64-bit-jvm
Problem 1: 30-50% of more heap is required on 64-bit. Why so? Mainly because of the memory layout in 64-bit architecture. First of all – object headers are 12 bytes on 64-bit JVM. Secondly, object references can be either 4 bytes or 8 bytes, depending on JVM flags and the size of the heap. This definitely adds some overhead compared to the 8 bytes on headers on 32-bit and 4 bytes on references. You can also dig into one of our earlier posts for more information about calculating the memory consumption of an object.
Problem 2: Longer garbage collection pauses. Building up more heap means there is more work to be done by GC while cleaning it up from unused objects. What it means in real life is that you have to be extra cautious when building heaps larger than 12-16GB. Without fine tuning and measuring you can easily introduce full GC pauses spanning several minutes. In applications where latency is not crucial and you can optimize for throughput only this might be OK, but on most cases this might become a showstopper.
To limit your impact for your Java EE environment, offload parts of it to other microservices such as ElasticSearch for search, Hazelcast for caching, your database for data storage and keep your Java EE server to host your application core itself rather than running the services inside it.
Archimedes Trajano
Torrent password recovery bundle 2012 advanced eye. If you have native libraries that support only 32-bit applications, you either need to use a 32-bit JVM, or build 64-bit versions of the libraries.
Andy ThomasAndy ThomasDepending on context, for local development I will always use a 64-bit JDK. Primarily because I would likely need the whole memory space for builds and the IDE.
That being said for integration to production, I would recommend 32-bit if it is possible. Why?
For some Java EE servers that are licensed for production use, it would depend on some factors like which machine how many cores etc. For WebSphere Liberty Profile specifically, you are also limited to 2GB.
64-bit JREs would take up slightly more memory and if you're trying to constrain it to something like 2GB or better yet 2x 1GB cluster you would have more flex space to work around in without paying a cent.
From https://plumbr.eu/blog/java/should-i-use-32-or-64-bit-jvm
Problem 1: 30-50% of more heap is required on 64-bit. Why so? Mainly because of the memory layout in 64-bit architecture. First of all – object headers are 12 bytes on 64-bit JVM. Secondly, object references can be either 4 bytes or 8 bytes, depending on JVM flags and the size of the heap. This definitely adds some overhead compared to the 8 bytes on headers on 32-bit and 4 bytes on references. You can also dig into one of our earlier posts for more information about calculating the memory consumption of an object.
Problem 2: Longer garbage collection pauses. Building up more heap means there is more work to be done by GC while cleaning it up from unused objects. What it means in real life is that you have to be extra cautious when building heaps larger than 12-16GB. Without fine tuning and measuring you can easily introduce full GC pauses spanning several minutes. In applications where latency is not crucial and you can optimize for throughput only this might be OK, but on most cases this might become a showstopper.
To limit your impact for your Java EE environment, offload parts of it to other microservices such as ElasticSearch for search, Hazelcast for caching, your database for data storage and keep your Java EE server to host your application core itself rather than running the services inside it.
Archimedes TrajanoArchimedes TrajanoI think there are two main differences to consider. One has been mentioned here but not the other.
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On the one hand, as other mentioned, the memory and data types. 32-bits and 64-bits JVMs use different native data type sizes and memory-address spaces.
- 64-bits JVMs can allocate (can use) more memory than the 32-bits ones.
- 64-bits use native datatypes with more capacity but occupy more space. Because that, the same Object may occupy more space too.
- For JVMs which the Garbage Collector (GC) freezes the machine, the 64-bits versions may be slower because the GC must check bigger heaps/objects and it takes more time.
- There is an IBM presentation explaining these differences.
And on the other hand, the supported native libraries. Java programs that use JNI to access native libraries require different versions depending on the type of JVM.
- 32-bits JVMs use 32-bits native libraries and 64-bits JVMs use 64bits libraries.
- That means that, if your program uses libraries that rely on native code such as SWT, you will need different versions of them. Note in the SWT download page, there are different versions for Linux/Windows 32- and 64-bits. Note that there are different versions of Eclipse (each one with a different version of SWT) for 32- and 64-bits.
- Some applications, such as Alloy, are packaged with 32-bits native libraries. They fail with 64-bit JVMs. You can solve these problems just downloading the corresponding 64-bits native libraries and configuring the JNI appropriately.
Do I need to understand the difference between 32-bit JVM and 64-bit JVM?
If you aren't building a performance critical application, you don't have to understand the difference. The subtle difference between 32-bit JVM and 64-bit JVM wouldn't make much difference to your application. You can skip reading further
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Does 64-bit JVM perform better than 32-bit JVM?
Most of us think 64-bit is bigger than 32-bit, thus 64-bit JVM performance will be better than 32-bit JVM performance. Unfortunately, it's not the case. 64-bit JVM can have a small performance degradation than 32-bit JVM. Below is the excerpt from Oracle JDK documentation regarding 64-bit JVM performance:
'Generally, the benefits of being able to address larger amounts of memory come with a small performance loss in 64-bit VMs versus running the same application on a 32-bit VM.
The performance difference comparing an application running on a 64-bit platform versus a 32-bit platform on SPARC is on the order of 10-20% degradation when you move to a 64-bit VM. On AMD64 and EM64T platforms this difference ranges from 0-15% depending on the amount of pointer accessing your application performs.'
What are the things to consider when migrating from 32-bit JVM to 64-bit JVM?a. GC Pause times
The primary reason to migrate from 32-bit JVM to 64-bit JVM is to attain large heap size (i.e. -Xmx). When you increase heap size, automatically your GC pause times will start to go high, because now there is more garbage in the memory to clear up. You need to do proper GC tuning before doing the migration, otherwise your application can experience several seconds to few minutes pause time. You can use the tools like GCeasy to come up with right GC settings for newly increased heap size.
b. Native Library
If your application is using Java Native Interface (JNI) to access native libraries, then you need to upgrade the native libraries as well. Because 32-bit JVM can use only 32-bit native library. Similarly, 64-bit JVM can use only 64-bit native library.
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