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README.md
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# 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.
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.
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 this case HermitCore run a single-kernel exklusive 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.
In this case HermitCore runs a single-kernel exclusively on the hardware or within a virtual machine.
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.
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
```
## 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.
To install the debian packets with following commands:
We provide binary packets for debian-based systems containing the complete HermitCore toolchain including a cross-compiler.
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
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.
For the multi-kernel environment, install the a 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).
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 latter, you have to install the modified Linux kernel.
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