Guys,
We upgraded from 2.6 to 4.9 recently, lots of new stuff to catch up with.
Anyway, we found the libpcap is obviously slower than previous version running on 2.6, first thing I am thinking about is enabling memory map at kernel building stage (PACKET_MMAP=true). But seems PACKET_MMAP is not supported at 4.x anymore, I am wondering any guru can help me with following questions:
1) how does 4.x enable the memory map?
2) any suggestions to tune up speed of libpcap running on 4.x kernel?
Many appreciation,
Tao
But seems PACKET_MMAP is not supported at 4.x anymore
No, it's still supported.
how does 4.x enable the memory map?
By being 4.x. :-) It's always enabled in 3.0 and later kernels; there's no configuration option required (or available).
Using VMware 10 and ubuntu 13.10 as the guest OS.
Installing the guest additions can provide hardware rendering for OpenGL 2.1
For academic purposes, there is a need to develop and run OpenGL 3+ code, preferably in the virtual machine.
I assume that it is not possible to use the host GPU, so I am trying to force software rendering, using an OpenGL 3+ renderer.
Mesa3D + llvmpipe seems promising, but I am unable to find information on whether the software renderer supports OpenGL 3+.
Is there a way to develop OpenGL 3+ under vmware?
EDIT: (For someone who replied and then deleted their post :p)
Yes, I am also seeing OpenGL 2.1 using glxinfo. I removed hardware acceleration in my VM, and am only interested in software rasterization, even if it is really slow. The question is, is there a version of llvmpipe that implements a software rasterizer for OpenGL versions higher than 2.1? I know that mesa3d supports it, albeit only for hardware.
The mesa software renderer (both the "old" pre-gallium swrast and the "new" gallium softpipe/llvmpipe), do support most of GL3.2. The only major thing missing is support for multisampling, hence they are not advertising full 3.0 support.
Update 2017
Current versions of mesa's various software rasterizers now do claim to support up to GL 3.3 in a core profile. (The progress can be tracked on https://mesamatrix.net/). However, there is a caveat, as documented in mesa's feature.txt:
freedreno, llvmpipe, softpipe, and swr have fake Multisample anti-aliasing support
which means they still do not fullfill the requirements of the GL 3.0 spec. However, in most cases, this will not matter in practice. But one should still be aware of that limitiation.
In case anyone is still interested, VMWare Workstation (both Workstation Pro and Workstation Player) have added OpenGL 3.3 support in version 12.
However, at the time of writing, the Linux guest drivers side of the equation has not been available, and is planned for Linux 4.3.
So: Use VMWare Workstation Player (or Pro, if you have it) version 12 or up, and Linux 4.3 or up.
Update: using VirtualBox without any kind of acceleration and Mesa LLVMpipe, I also get OpenGL 3.3 support (Mesa version is 17.1.1)
Can you run Xcode in Linux? Mac OS X was based on BSD Unix, so is it possible?
From what I have heard, there is a MonoDevelop plugin that has an iPhone simulator.
The low-level toolchain for Xcode (the gcc compiler family, the gdb debugger, etc.) is all open source and common to Unix and Linux platforms. But the IDE--the editor, project management, indexing, navigation, build system, graphical debugger, visual data modeling, SCM system, refactoring, project snapshots, etc.--is a Mac OS X Cocoa application, and is not portable.
Nobody suggested Vagrant yet, so here it is, Vagrant box for OSX
vagrant init AndrewDryga/vagrant-box-osx --box-version 0.2.1
vagrant up
# editor's notes:
# - this requires virtualbox
# - version 0.3.1 (2016) is down now, so version 0.2.1 (2015)
# - there are notes for building an image one's self at the site
and you have a MACOS virtual machine. But according to Apple's EULA, you still need to run it on MacOS hardware :D But anywhere, here's one to all of you geeks who wiped MacOS and installed Ubuntu :D
Unfortunately, you can't run the editors from inside using SSH X-forwarding option.
I really wanted to comment, not answer. But just to be precise, OSX is not based on BSD, it is an evolution of NeXTStep. The NeXTStep OS utilizes the Mach kernel developed by CMU. It was originally designed as a MicroKernel, but due to performance constraints, they eventually decided they needed to include the Unix portion of the API into the kernel itself and so a BSD-compatible "server" (originally intended to process requests for BSD-compatible kernel messages) was moved into the kernel, making it a Monolithic kernel. It may be BSD compatible in the programming API, but it is NOT BSD.
The rest of the OS involved ObjectiveC (under arrangements between Stepstone and Richard Stallman of GNU/GCC) with a GUI based on a technology called "Display Postscript" ... sort of like an X Server, but with postscript commands. OS X changed Display Postscript to Display PDF, and increased the general hardware requirements 1000 fold (NeXT could run in 8-16MB, now you need GB).
Due to the close marriage of GCC and Objective C and NeXT, your best bet at running XCode natively under Linux would be to do a port (if you can get ahold of the source - good luck) utilizing the GNUStep libraries. Originally designed for NextStep and then OpenStep compatibility, I've heard they are now more-or-less Cocoa compatible, but I've not played with any of it in almost 2 decades. Of course that only gets you as far as ObjC, not Swift, and I don't know if Apple is going to OpenSource it.
You can run Xcode on Linux NATIVELY using Darling:
Darling is a translation layer that lets you run macOS software on Linux
Once installed you can install Xcode via command-line developer tool following this link.
If you run VMware Player or Workstation (or maybe VirtualBox, I'm not sure if it supports Mac OS X, but may), and then Mac OS X Server (Client can't legally be virtualized). Of course, in this case you are running XCode on OS X, but your host machine could be linux.
If you cannot shell out thousands of dollars for a decent Mac then there is an option to run OSX and XCode in the cloud:
http://www.macincloud.com/
I think you need MonoTouch (not free!) for that plugin.
And no, there is no way to run Xcode on Linux.
Sorry for all the bad news. :)
Nope, you've heard of MonoTouch which is a .NET/mono environment for iPhone development. But you still need a Mac and the official iPhone SDK. And the emulator is the official apple one, this acts as a separate IDE and allows you to not have to code in Objective C, rather you code in c#
It's an interesting project to say the least....
EDIT: apparently, you can distribute on the app store now, early on that was a no go....
The easiest option to do that is running a VM with a OSX copy.
It was weird that no one suggested KVM.
It is gonna provide you almost native performance and it is built-in Linux.
Go and check it out.
you will feel like u are using mac only and then install Xcode there
u may even choose to directly boot into the OSX GUI instead of Linux one on startup
If you really want to use Xcode on linux you could get Virtual Box and install Hackintosh on a VM.
Edit: Virtual Box Guest Additions is not supported with MacOS Movaje. You will want to use VMware
https://www.vmware.com/
https://hackintosh.com/
If you want XCode on another OS, I suggest cloud computing. That way your app is being developed on a Mac and can be submitted to the App Store.
Use quiling framework
For more info check at https://github.com/qilingframework/qiling
I think it is the best
Maybe you can use Virtual Machine and Qiling framework.
If you are planning to use a Mac VM on Linux, check out Docker-OSX. It provides a simple approach to use pre-built Mac VMs with Docker.
To know more about the legality of running Apple software on non-Apple hardware, read this article: Is Hackintosh, OSX-KVM, or Docker-OSX legal?
OSX is based on BSD, not Linux. You cannot run Xcode on a Linux machine.
I want to start development using qt-embedded on my embedded device project. Can you tell me which linux should I use on my computer for development. Well, It should have VMWARE-tools support ( Fedora Core 11 does not have it ).
Thanks, Sunny.
I got a whole dedicated website for this issue (crosscompile.org) ;-)
Anyway, we use ubuntu and at http://www.crosscompile.org/static/pages/crosstool.html you can see the toolchain building process
Hope it helps you.
ubuntu 9.04, fedora 11, redhat...
what are the differences from a web server/development standpoint?
None. They differ only in how they package things, but they're all essentially the same - same operating system, same software. Some people get quite emotional about this choice, but I've used several, and there's nothing to pick between them these days.
I like to choose linux distros based on whichever ones have the most help available online. I'd probably go with CentOS or Ubuntu for that reason.
Use whatever your hardware vendor is happy to support. If you're serious about running a production system, you will use a supported OS.
Having said that, most vendors don't officially support Centos, however it is sufficiently similar (i.e. almost identical) to Redhat Enterprise that they ignore the difference.
Your code might run anywhere, but your hardware vendor's tools probably won't. You'll want to use those.
For tomcat there is not any difference but as a server: Ubuntu is more cutting edge in terms of kernel and packages. Ubuntu package management is superior and easier. If you will prefer Ubuntu then use server edition it is optimized as a server. CentOS is said to be solid but I haven't got much experience with it. If you are considering a virtual server different distros have different level of support for different virtualization technologies just keep it in your mind.
If you are new to linux, then I defiantly recommend Ubuntu. You can be up and running in now time with apt-get.