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# HermitCore - A lightweight unikernel for a scalable and predictable runtime behavior # HermitCore - A lightweight unikernel for a scalable and predictable runtime behavior
The project [HermitCore](http://www.hermitcore.org) is new [unikernel](http://unikernel.org) targeting a scalable and predictable runtime for high-performance computing and cloud computing. The project [HermitCore](http://www.hermitcore.org) is new [unikernel](http://unikernel.org) targeting at a scalable and predictable runtime for high-performance and cloud computing.
HermitCore extends the multi-kernel approach (like [McKernel](http://www-sys-aics.riken.jp/ResearchTopics/os/mckernel.html)) with unikernel features for a better programmability and scalability for hierarchical systems. HermitCore extends the multi-kernel approach (like [McKernel](http://www-sys-aics.riken.jp/ResearchTopics/os/mckernel.html)) with unikernel features for a better programmability and scalability for hierarchical systems.
On the startup of HermitCore applications, cores are isolated from the Linux system enabling the bare-metal of the applications on these cores. On the startup of HermitCore applications, cores are isolated from the Linux system enabling the bare-metal of the applications on these cores.
This approach achieves lower OS jitter and a better scalability compared to full-weight kernels. This approach achieves lower OS jitter and a better scalability compared to full-weight kernels.
Inter-kernel communication between HermitCore applications and the Linux system is realized by means of an IP interface. Inter-kernel communication between HermitCore applications and the Linux system is realized by means of an IP interface.
In addition to the multi-kernel approach described above, HermitCore can be used as classical standalone unikernel as well. In addition to the multi-kernel approach described above, HermitCore can be used as classical standalone unikernel as well.
In this case HermitCore run a single-kernel exklusive on the hardware or within a virtual machine. In this case HermitCore runs a single-kernel exclusively on the hardware or within a virtual machine.
This reduces the demand on resources and improves the boot time, which is an excellent behavior for cloud computing. This reduces the resource demand and improves the boot time which is critical for cloud computing applications.
It is the result of a research project at RWTH Aachen University and is currently an experimental approach, i.e., not production ready. It is the result of a research project at RWTH Aachen University and is currently an experimental approach, i.e., not production ready.
Please use it with caution. Please use it with caution.
@ -27,18 +27,18 @@ On Debian-based systems the packets can be installed by executing:
sudo apt-get install qemu-system-x86 nasm texinfo libmpfr-dev libmpc-dev libgmp-dev libisl-dev flex bison sudo apt-get install qemu-system-x86 nasm texinfo libmpfr-dev libmpc-dev libgmp-dev libisl-dev flex bison
``` ```
## Installing HermitCore with help of debian packets ## Installing HermitCore with by using debian packets
We provide binary packets for Debian-based systems, which contains the whole HermitCore toolchain including a cross-compiler. We provide binary packets for debian-based systems containing the complete HermitCore toolchain including a cross-compiler.
To install the debian packets with following commands: To install the packets you have to execute the following commands:
``` ```
echo "deb [trusted=yes] https://dl.bintray.com/rwth-os/hermitcore vivid main" | sudo tee -a /etc/apt/sources.list echo "deb [trusted=yes] https://dl.bintray.com/rwth-os/hermitcore vivid main" | sudo tee -a /etc/apt/sources.list
sudo apt-get -qq update sudo apt-get -qq update
sudo apt-get install binutils-hermit newlib-hermit pthread-embedded-hermit gcc-hermit libhermit sudo apt-get install binutils-hermit newlib-hermit pthread-embedded-hermit gcc-hermit libhermit
``` ```
This toolchain is able to build applications to run within VM as [classical unikernel](#building-and-testing-hermitcore-as-classical-standalone-unikernel) or bare-metal in a multi-kernel environment. This toolchain is able to build applications for [classical unikernel](#building-and-testing-hermitcore-as-classical-standalone-unikernel) environments within virtual machines or bare-metal in a multi-kernel environment.
For the multi-kernel environment, install the a modified Linux kernel. For the latter, you have to install the modified Linux kernel.
An introduction is published in section [Building and testing HermitCore as multi-kernel on a real machine](#building-and-testing-hermitcore-as-multi-kernel-on a-real-machine). An introduction to this execution mode is provided in section [Building and testing HermitCore as multi-kernel on a real machine](#building-and-testing-hermitcore-as-multi-kernel-on a-real-machine).
## Building and testing HermitCore as multi-kernel within a virtual machine ## Building and testing HermitCore as multi-kernel within a virtual machine