All the info I can find basically says the 64 bit version is available but I can't find any info on what exactly that means? How is it different from the 32bit version?
From the release notes:
Large file support - Improved performance for large files, no size limit on 64-bit machines.
64-bit Windows builds - Use your computer's full address space with the 64-bit builds.
For example, to open large files (the 32 bit version has now a limit of 300 MB, previously it was 50 MB) you'll need the 64 bit version.
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What is the sweet spot PC configuration to download and build android AOSP (as of 2022)?
I am new to PC building and don't have much knowledge about PC
You can see the complete system requirements and recomendations at https://source.android.com/setup/build/requirements
A 64-bit environment is required for Android 2.3.x (Gingerbread) and higher versions, including the master branch. You can compile older versions on 32-bit systems.
At least 250GB of free disk space to check out the code and an extra 150 GB to build it. If you conduct multiple builds, you need additional space.
At least 16 GB of available RAM is required, but Google recommends 64 GB.
As of June 2021, Google is using 72-core machines with 64 GB of RAM internally, which take about 40 minutes for a full build (and just a few minutes for incremental builds, depending on exactly which files were modified). By contrast, a 6-core machine with a similar amount of RAM takes 3 hours.
The issue that I experience is that when running simulations (same IBPSA/AixLib-based models) on Linux I get a significant performance drop (simulation time is about doubled) in comparison to a Windows 8 machine. Below you find the individual specs of the two machines. In both cases I use Cvode solver with equal settings. Compilation is done with VC14.0 (Win) or GCC (Xubuntu).
Is this issue familiar to someone or can anyone help what the reason might be?
Win 8:
Intel Xeon #2.9GHz (6 logic processors)
32 GB RAM
64-Bit
Xubuntu 16.04 VM:
Intel Xeon #3.7GHz (24 logic processors)
64 GB RAM
64-Bit
Thanks!
In addition to the checklist in the comments, also consider enabling hardware virtualization support if not already done.
In general gcc tends to produce slower code than Visual Studio. In order to turn on optimization one could try adding the following line:
CFLAGS=$CFLAGS" -02"
at the top of insert/dsbuild.sh.
The reason for not having it turned on by default is to avoid lenghty compilations and bloated binaries. For industrial sized models these are actual issues.
Beginner here.
cpu says > 4GB, OS tells <4GB.
What is the answer?
I saw in windows, it is 2.8GB, in linux i think it can access complete 4GB
I have a Java application which uses some native code. This application needs to run on the largest set of machine-OS-JVM platform combos, but here are the main ones I'm targetting initially:
Machine types: 32-bit and 64-bit
OSes: Windows, Linux, and Mac
JVMs: 32-bit and 64-bit
Question 1: Which of the following combos are valid by themselves (without even bringing my application into the picture)? It'd be great to also know a one-line reason for the invalid combos other than simply knowing they are invalid.
====================================
hw os jvm valid?
====================================
1. 32 32 32 yes
2. 32 32 64
3. 32 64 32
4. 32 64 64
5. 64 32 32
6. 64 32 64
7. 64 64 32
8. 64 64 64 yes
====================================
By 'valid', I expect that not only the application should run, it should also run flawlessly - without even intermittent crashes, hangups, slowness, etc
Question 2: I know I can use Java's System properties to determine the values of the above parameters (hw, os, and jvm) and then dynamically load the appropriate version of my native code. But I'd like to know the minimum number of combo versions I can ship my application with, given that my application does not need to use the extended memory nor any potential speed improvements offered by 64-bit platforms.
In general the width of the hardware must be greater than or equal to the width of the os which must be greater than or equal to the width of the application. Also the application is generally oblivious to the maximum width of the hardware so there are only three configs that matter:
32 bit os - 32 bit app
64 bit os - 32 bit app
64 bit os - 64 bit app
Now if the app is 32 bit it normally doesn't matter if the os is 64 bit. (it can if you're working with drivers or things that work inside the os) So you need one 32 bit and one 64 bit version per platform. So six versions in total.
This might be a dumb/naive question, and if it is please excuse me :)
I have a brand new machine with the following specs:
Inter Core i7 2600#3.4GHz
RAM 8 GB
Windows 7
This machine has a 64 bits architecture.
On my previous machine, I used to install 32 bits versions of Eclipse and run it using a 32 bits JRE, and my current Eclipse setup works perfectly on the new machine.
I tried to install a 64bits version of Eclipse, and run it with a 64 bits JRE, and I am wondering if there are any compelling reasons to switch to this kind of setup or stick to my existing install. I guess that I would have to reinstall all the plugins, and maybe find that some of them are not compatible with the 64 bits version of Eclipse.
So far, the 64 bits version seems to need quite some more RAM than the 32 bits version, which is something that I expected, but nothing seems to have improved.
Thanks for your advice!
In general I use 64-bit Eclipse without problem, but there can be issues around plug-ins such as:
Adobe Flash Builder only works with 32-bit
The Subversion plug-in Subclipse needs a native 64-bit version of Subversion installed separately
There may be more but those are the ones I've encountered in the past.
Moving to 64-bit gives you access to more addressable memory but it won't speed anything up, in fact it might reduce performance in some cases (but nothing I see as significant to what I do).
Well the only thing that will improve is that you are able to use the advantages of 64bit. Other then that I'm not aware of any improvement.
For example what's better in 64bit is that if you have a very large project set you would be able to handle it more comfortably. For more information on 64-bit please look here
If you want to be on the edge of technology your choice would of course be the 64bit setup.
About the ram, this is expected because some of the Datatyps now use 64bit and are therefore larger to store in memory.
For most plugins you will get a 64bit version or alternative and so far for what I've used it it always worked.