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Revision as of 20:44, 12 April 2011 by MikyungKang (talk)


This blueprint proposes to add support for the Tilera tiled-processor machines as an alternative machine type in OpenStack. This blueprint is dependent on the schema changes described in the HeterogeneousInstanceTypes blueprint and the scheduler in HeterogeneousArchitectureScheduler.

The target release for this is Diablo, however the USC-ISI team intends to have a stable test branch and deployment at Cactus release.

The USC-ISI team has a functional prototype here:

This blueprint is related to the HeterogeneousInstanceTypes blueprint here:

We are also drafting blueprints for other machine types:

An etherpad for discussion of this blueprint is available at http://etherpad.openstack.org/heterogeneoustilerasupport

Release Note

Nova has been extended to allow support for the Tilera TILEmpower Platform (TILEPro64 Processor).


See HeterogeneousInstanceTypes.

User stories

Only tp64.8x8 instance type is chosen with 16GB of memory and 64 cores.

$ euca-add-keypair $key > $key.pem
$ chmod 600 $key.pem
$ euca-run-instances -k $key -t tp64.8x8 ami-5c86a016

$ ssh -i key.pem -p 52108 $Given_Tilera_IP_address


This blueprint is dependent on tp64.8x8 being a selectable instance type and that the scheduler knows this instance must get routed to a TILEmpower board. See HeterogeneousArchitectureScheduler.


The tilera machine is unique in that it has a NxN mesh of processor cores. Currently there is no support for KVM or XEN virtualization, so we are doing a bare metal approach.

Schema Changes

We're proposing the following default values added to the instance_types table.

   't64.8x8':  dict(memory_mb=16384, vcpus=1, local_gb=500,
   'tp64.8x8': dict(memory_mb=16384, vcpus=1, local_gb=500,
   'tgx.4x4':  dict(memory_mb=16384, vcpus=1, local_gb=500,
   'tgx.6x6':  dict(memory_mb=16384, vcpus=1, local_gb=500,
   'tgx.8x8':  dict(memory_mb=16384, vcpus=1, local_gb=500,
   'tgx.10x10':  dict(memory_mb=16384, vcpus=1, local_gb=500,

Supporting Non-virtualizable Architecture

To support non-virtualizable architecture, for example, TILERA doesn't support KVM/XEN virtualization yet, Proxy Compute Node should be designed. The Tilera Compute Node is an example of Proxy Compute Node in the following figure.

An x86 Proxy Compute Node is connected to the Tilera boards through network. A Proxy Compute Node may handle multiple Tilera boards. Tilera boards are connected to the network such that a cloud user can ssh into them directly. Proxy Compute Node is the tftp server for the Tilera boards. After Proxy Compute node receives instance images from the image server, it wakes up a Tilera board and passes those images to Tilera boards using tftp protocol. The finite state machine shown below describes the procedure in detail.

Once tilera file system is ready on TILEmpower board, Proxy Compute Node doesn't do anything except turning off/on the board. Once tilera instance is running, user can access the TILEmpower board, not Proxy Compute Node, through ssh.

File:HeterogeneousTileraSupport$Tilera Instance.png

1. TFTP setting for Proxy Compute Node

$ vi /etc/xinetd.d/tftp 
service tftp
protocol = udp
port = 69
socket_type = dgram
wait = yes
user = root 
server = /usr/sbin/in.tftpd
server_args = /tftpboot
disable = no
$ /etc/init.d/xinetd restart

2. File preparation in Proxy Compute Node:/tftpboot

- Different vmlinux and file system are used for each TILEmpower board.

Copy the following files to /tftpboot:
• vmlinux_0_1, vmlinux_1_1, vmlinux_2_1, vmlinux_3_1, vmlinux_4_1, vmlinux_5_1, vmlinux_6_1, vmlinux_7_1, vmlinux_8_1, vmlinux_9_1
• vmlinux_0_2, vmlinux_1_2, vmlinux_2_2, vmlinux_3_2, vmlinux_4_2, vmlinux_5_2, vmlinux_6_2, vmlinux_7_2, vmlinux_8_2, vmlinux_9_2
• mboot.bootrom
• pdu_mgr
• tilera_boards
• tilera_fs_1G
Copy tilera_fs_1G to tilera_fs_0, ..., tilera_fs_9. At the bash prompt, do:
for i in {0..9}
cp /tftpboot/tilera_fs_1G /tftpboot/tilera_fs_$i

2.1 Tilera boards information: /tftpboot/tilera_boards

- Proxy Compute Node manges board information (board_id, board_ip_address, board_mac_address, board_hw_description, etc.) using this tilera_boards file.

# board_id  ip_address mac_address 
0     00:1A:CA:00:57:90 10 16218 917 476 1 tilera_hv 1 
1     00:1A:CA:00:58:98 10 16218 917 476 1 tilera_hv 1       
2     00:1A:CA:00:58:50 10 16218 917 476 1 tilera_hv 1      
3     00:1A:CA:00:57:A8 10 16218 917 476 1 tilera_hv 1    
4     00:1A:CA:00:58:AA 10 16218 917 476 1 tilera_hv 1 
5     00:1A:CA:00:58:2C 10 16218 917 476 1 tilera_hv 1 
6     00:1A:CA:00:58:5C 10 16218 917 476 1 tilera_hv 1       
7     00:1A:CA:00:58:A4 10 16218 917 476 1 tilera_hv 1 
8     00:1A:CA:00:58:1A 10 16218 917 476 1 tilera_hv 1 
9    00:1A:CA:00:58:38 10 16218 917 476 1 tilera_hv 1  

2.2 pdu_mgr

- PDU(Power Distribute Unit)-controlling EXPECT script for remote turn-on/off/reboot of TILEmpower board

3. Bare metal approach without supporting KVM or XEN virtualization (nova/virt/tilera.py)

- After setting the status of instance and domain as Pending, Proxy Compute Node copies vmlinux_x_1 to vmlinux_x. The x means the board_id and 1 means the first boot with vmlinux image which sets TLR_ROOT=tmpfs. By default the rootfs is copied to a tmpfs whose size limit is half of total memory. After 1st mboot-run through tftp download of vmlinux, Proxy Compute Node uploads compressed tilera file system into memory, mounts /dev/sda1 to /mnt, and uncompresses the uploaded tilera file system into /mnt disk space. And then Proxy Compute Node copies vmlinux_x_2 to vmlinux_x. The x means the board_id and 2 means the second boot with vmlinux image which sets TLR_ROOT=/dev/sda1. After second mboot-run, rootfs is set as /dev/sda1. After that, Proxy Compute Node sets the status of instance and domain as Running. Then user can access the board through ssh.

File:HeterogeneousTileraSupport$Tilera Compute.png


The USC-ISI team has a functional prototype: https://code.launchpad.net/~usc-isi/nova/hpc-trunk

UI Changes

The following will be available as new default instance types.

Tilera TILEPro64

  • API name: tp64.8x8
  • TILEPro64 processor: 64 (8x8) cores
  • 16 GB RAM (16384 MB)
  • 1 TB of instance storage
  • http://www.tilera.com/

(Only one Tilera instance type for now. When KVM support appears, we will add additional types to support partitioning into smaller instances)

Code Changes

  • nova/db/sqlalchemy/migrate_repo/versions/013_add_architecture_to_instance_types.py
  - add default instance types for tilera
  • nova/virt/connection.py
  - add tilera connection_type
  • nova/virt/tilera.py
  - new tilera connection code for launching instances on TILEmpower board
  • nova/virt/tilera.xml.template and nova/virt/tilera_interfaces.template
  - new tilera template files
  - add tilera related template files


Very little needs to change in terms of the way deployments will use this if we set sane defaults like "x86_64" as assumed today.

Test/Demo Plan

This need not be added or completed until the specification is nearing beta.

Unresolved issues

One of the challenges we have is that the flavorid field in the instance_types table isn't auto-increment. We've selected high numbers to avoid collisions, but the community should discuss how flavorid behaves and the best approach for adding future new instance types.

BoF agenda and discussion

Use this section to take notes during the BoF; if you keep it in the approved spec, use it for summarising what was discussed and note any options that were rejected.