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Add description to the standalone version of HermitCore

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In the source code, we use the notation "single kernel" for the standalone version because the multi-kernel approach is default case.
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Stefan Lankes 2016-08-02 07:48:42 +02:00 • committed by GitHub
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README.md
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@ -6,7 +6,8 @@ By starting HermitCore applications, cores will be split off from the Linux syst
This approach achieves a lower OS jitter and a better scalability.
HermitCore applications and the Linux system can communicate via an IP interface (e.g. inter-kernel communication).
HermitCore 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 carefully.
HermitCore could be also used as classical standalone unikernel, which reduces the demand on resources and improves the boot time.
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 carefully.
## Requirements
@ -48,3 +49,21 @@ NM_CONTROLLED=yes
Finally, boot your system with the new Linux kernel and follow the above tutorial (*Building and testing HermitCore within a virtual machine*) from point 5.
The demo applications are stored in their subdirectories `hermit/usr/{tests,benchmarks}` of the directory, which contains this *README*.
## HermitCore as classical standalone unikernel
HermitCore applications could be directly started within a virtual machine.
Currently, a file system is missing and a UART device is used as output device.
In the upcoming example, the console is redirected to the local host at port 4555.
To view the messages, *netcat* has to be started and to listen on port 4555.
```
nc -l 4555
```
Afterwards, a virtual machine has to be initialized, which used the HermitCore loader (`hermit/arch/x86/loader/ldhermit.elf`) to load HermitCore binaries as initrd.
No modifications to the binary are needed!
```
qemu-system-x86_64 -machine accel=kvm -cpu host -smp 10 -m 4G -kernel hermit/arch/x86/loader/ldhermit.elf -initrd hermit/usr/benchmarks/stream \
-net nic,model=rtl8139 -net user -net dump \
-chardev socket,host=127.0.0.1,port=4555,id=gnc0 \
-device pci-serial,chardev=gnc0 -nographic
```