Supercomputer System HBW2 TOPHBW2 FAQ/Inquiry Template
Japanese
HBW2 FAQ/Inquiry Template

Could you please send us a filled-in application form of the following template via e-mail for inquiries and consultations about HOKUSAI.
Please also refer to the following FAQ.

Inquiry Template

To:
Subject:  Inquiry about **************
Message:
1 Full name :
2 Project ID :
3 System concerned (Delete no-corresponding systems from the list)
– HBW2 Portal
– Front-end server
– MPC
– Online Storage System (OFS)
– Others
4 Detailed content
Request items
  • If an error message is displayed, please inform us about the message, operation procedure up to the error, reproducibility, date when the issued occurred, JOB ID, etc.
  • If possible, the path of the source code of corresponding program.
  • The following information make the investigation and solution smooth: OS and its version of your PC, Name and version of your browser.

 

FAQ

HBW2 Portal
Q1. Where can I apply to use HBW2?

A1: You can apply to use HBW2 at the HBW2 Portal. However, for HPCI projects, please follow the Using HPCI page.

Q2: How can I log in to HBW2 Portal?

A2: RIKEN researchers (including visiting scientists) use the integrated authentication platform (Shibboleth authentication). All others will use their HBW2 account for authentication. For details, see the HBW2 Portal User Guide.

Q3. I don’t know the password for the Integrated Authentication Platform (Shibboleth authentication).

A3. Unlike Okta, Shibboleth authentication is available to RIKEN ID holders, including visiting scientists.
The initial password should have been given to you when you entered RIKEN, but if you do not know it, you can change the password according to the “How to reset Okta/Shibboleth” in Okta/Shibboleth (Single Sign-On/MFA).

Q4. I am a visiting scientist, do I need to set up a forwarding address for my RIKEN A-mail(@a.riken.jp)?

A4: In order for visiting scientists to use HBW2, it is necessary to set up a forwarding address for RIKEN A-mail. This is because they need to be able to receive the RIKEN A-mail address when resetting their password for the Integrated Authentication Infrastructure (Shibboleth authentication) and registering their ssh public key. If you can already receive emails addressed to the RIKEN A-mail, there is no problem.
For information on how to set up RIKEN A mail forwarding, see the RIKEN internal RIKEN A Email (@a.riken.jp) FAQ page.
If you cannot see the page, please ask your laboratory assistant orother staff to contact the email operations staff.

Q5. What is an HBW2 portal user?

A5. HBW2 portal user is required to become an HBW2 project member, and is created when you enter your user details on your first login to the HBW2 portal.
You can apply for new projects, and you can make various applications and view information related to your project.

Q6. What is an HBW2 account?

A6. A Linux account is required to use the HBW2 computing resources. It is created when you first become a project member.
Once you have registered your ssh public key on the HBW2 Portal, you can log in to the HBW2 front-end server.

Q7. I do not use HBW2, but I want to manage our projects and keep track of their status.

A7. When you register as an project member, please select “manage” and you will not be created an HBW2 account, but you will be able to track the status of your project on the HBW2 Portal.
If you set the member category as the assistant project representative, you will be able to submit various types of applications related to the project

Q8. I am not sure if my new project application was successful.

A8. If the application is incomplete, the application will fail. If the application is successful, the application list will be displayed and an email will be sent to the applicant.
Only the applicant can check the status of the application for new project.

Front-end server
Q1. can I access the HBW2 front-end server from outside the RIKEN network?

A1. HBW2 front-end server can be accessed from outside RIKEN in the same way as from within RIKEN.

Q2. The following message is output and I can not login to HOKUSAI front-end server.
“Permission denied (publickey,gssapi-with-mic,hostbased)”

A2. There is a possibility that the public key to login doesn’t exist on the front-end server.
You need to access HBW2 Portal to register the public key.

Q3. I could login to HOKUSAI front-end servder up to now, but the following message was output and I could not login anymore.
“Permission denied (publickey)”

A3. Please inform HOKUSAI administrator of an output error messages.

Q4. I have registered public key and login to HOKUSAI front-end servder by ssh,
but the following message is output and I can not login to HOKUSAI front-end servder.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘greatwave.riken.jp,134.160.228.11’ (RSA) to the list of known hosts.
Permission denied (publickey).

A4. Please specify private key file you have made, and try to access HOKUSAI front-end servder.
$ ssh -i private_key_file -l username hokusai.riken.jp

Job Management and Execution
Q1. Calculation is slow with OpenMP.

A1. Please specify “–cpus-per-task=${SLURM_CPUS_PER_TASK}” at program execution as follows
srun –cpus-per-task=${SLURM_CPUS_PER_TASK} a.out

Q2. I want to run a job occupying a node.

A2. please specify the maximum amount of memory per node.
For example, if you want to occupy one node in MPC, specify “–mem=112G.
In this case, the calculation time is calculated assuming that 112 cores are used.

Q3: How can I specify the amount of memory per node to execute a job?

A3. The option to specify the amount of memory per node is “–mem”.
For example, if you want to allocate 16 GiB per node in MPC, specify “–mem=16G” and execute the job.
In MPC, the amount of memory allocated per core is 1 GiB. Therefore, even if only one core is used in a calculation, if 16 GiB of memory is allocated, the calculation time is calculated as if 16 cores were allocated.

Q4: How can I specify the amount of memory per CPU core to execute a job?

A4. The option to specify the amount of memory per CPU core is “–mem-per-cpu”.
For example, if you want to allocate 2500 MiB per CPU core on MPC, specify “–mem-per-cpu=2500M”.
In MPC, the amount of memory allocated per core is 1 GiB. Therefore, even if only one core is used for the calculation, if 2500 MiB of memory is allocated, the calculation time is calculated as if 3 cores were allocated.

Q5: I want to perform calculations with hyper-threading turned on.

A5. Hyper-threading is turned on for some MPC nodes during the trial operation, so please try it out.
If you want to use a node with hyperthreading turned on, please specify “mpc_ht” as the partition.
Note that when hyperthreading is turned on, one CPU core is used for two processing operations.
Also, the calculation of computation time and memory allocation will be made after the number of CPU cores allocated is halved.