Niagara: Difference between revisions
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| Availability: In production since April 2018 | | Availability: In production since April 2018 | ||
|- | |- | ||
| Login node: '''niagara. | | Login node: '''niagara.alliancecan.ca''' | ||
|- | |- | ||
| Globus endpoint: '''computecanada#niagara''' | | Globus endpoint: '''computecanada#niagara''' | ||
|- | |- | ||
| Data mover nodes (rsync, scp, ...): '''nia-dm2, nia-dm2''', see [[ | | Data mover nodes (rsync, scp, ...): '''nia-dm2, nia-dm2''', see [[Data_management_at_Niagara#Moving_data|Moving data]] | ||
|- | |- | ||
| System Status Page: '''https://docs.scinet.utoronto.ca''' | | System Status Page: '''https://docs.scinet.utoronto.ca''' | ||
|- | |||
| Portal : https://my.scinet.utoronto.ca | |||
|} | |} | ||
| Line 24: | Line 26: | ||
and Cedar, but slightly different. | and Cedar, but slightly different. | ||
<!--T:29--> | |||
Preliminary documentation about the GPU expansion to Niagara called "[https://docs.scinet.utoronto.ca/index.php/Mist Mist]" can be found on [https://docs.scinet.utoronto.ca/index.php/Mist the SciNet documentation site]. | Preliminary documentation about the GPU expansion to Niagara called "[https://docs.scinet.utoronto.ca/index.php/Mist Mist]" can be found on [https://docs.scinet.utoronto.ca/index.php/Mist the SciNet documentation site]. | ||
<!--T:5--> | <!--T:5--> | ||
Niagara is an allocatable resource in the 2018 [https:// | Niagara is an allocatable resource in the 2018 [https://alliancecan.ca/en/services/advanced-research-computing/accessing-resources/resource-allocation-competition Resource Allocation Competition] (RAC 2018), which has come into effect on April 4, 2018. | ||
<!--T:6--> | <!--T:6--> | ||
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=Niagara hardware specifications= <!--T:3--> | ==Niagara hardware specifications== <!--T:3--> | ||
<!--T:8--> | <!--T:8--> | ||
* | * 2024 nodes, each with 40 Intel "Skylake" cores at 2.4 GHz or 40 Intel "CascadeLake" cores at 2.5 GHz, for a total of 80,640 cores. | ||
* 202 GB (188 GiB) of RAM per node. | * 202 GB (188 GiB) of RAM per node. | ||
* EDR Infiniband network in a | * EDR Infiniband network in a 'Dragonfly+' topology. | ||
* | * 12.5PB of scratch, 3.5PB of project space (parallel filesystem: IBM Spectrum Scale, formerly known as GPFS). | ||
* 256 TB burst buffer (Excelero + IBM Spectrum Scale). | * 256 TB burst buffer (Excelero + IBM Spectrum Scale). | ||
* No local disks. | * No local disks. | ||
* No GPUs. | * No GPUs. | ||
* Theoretical peak performance ("Rpeak") of | * Theoretical peak performance ("Rpeak") of 6.25 PF. | ||
* Measured delivered performance ("Rmax") of 3. | * Measured delivered performance ("Rmax") of 3.6 PF. | ||
* | * 920 kW power consumption. | ||
=Attached storage systems= <!--T:9--> | ==Attached storage systems== <!--T:9--> | ||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
|- | |- | ||
| Line 57: | Line 60: | ||
* Persistent | * Persistent | ||
|- | |- | ||
| '''Scratch'''<br> | | '''Scratch'''<br>12.5PB (~100GB/s Write, ~120GB/s Read)<br>Parallel high-performance filesystem (IBM Spectrum Scale)|| | ||
* Inactive data is purged. | * Inactive data is purged. | ||
|- | |- | ||
| Line 63: | Line 66: | ||
* Inactive data is purged. | * Inactive data is purged. | ||
|- | |- | ||
|'''Project'''<br > | |'''Project'''<br >3.5PB (~100GB/s Write, ~120GB/s Read)<br>Parallel high-performance filesystem (IBM Spectrum Scale|| | ||
* Backed up to tape | * Backed up to tape | ||
* Allocated through [https:// | * Allocated through [https://alliancecan.ca/en/services/advanced-research-computing/accessing-resources/resource-allocation-competition RAC] | ||
* Persistent | * Persistent | ||
|- | |- | ||
| '''Archive'''<br /> | | '''Archive'''<br />20PB<br />High Performance Storage System (IBM HPSS)|| | ||
* tape-backed HSM | * tape-backed HSM | ||
* Allocated through [https:// | * Allocated through [https://alliancecan.ca/en/services/advanced-research-computing/accessing-resources/resource-allocation-competition RAC] | ||
* Persistent | * Persistent | ||
|} | |} | ||
=High-performance interconnect= <!--T:10--> | ==High-performance interconnect== <!--T:10--> | ||
<!--T:11--> | <!--T:11--> | ||
The Niagara cluster has an EDR Infiniband network in a | The Niagara cluster has an EDR Infiniband network in a 'Dragonfly+' topology, with five wings. | ||
'Dragonfly+' topology, with | Each wing of maximually 432 nodes (i.e., 17280 cores) has | ||
1-to-1 connections. Network traffic between wings is done through | 1-to-1 connections. Network traffic between wings is done through | ||
adaptive routing, which alleviates network congestion and yields an effective blocking of 2:1 between nodes of different wings. | adaptive routing, which alleviates network congestion and yields an effective blocking of 2:1 between nodes of different wings. | ||
=Node characteristics= <!--T:12--> | ==Node characteristics== <!--T:12--> | ||
<!--T:13--> | <!--T:13--> | ||
| Line 92: | Line 95: | ||
* Operating system: Linux CentOS 7 | * Operating system: Linux CentOS 7 | ||
=Scheduling= <!--T:14--> | ==Scheduling== <!--T:14--> | ||
<!--T:15--> | <!--T:15--> | ||
| Line 104: | Line 107: | ||
Details, such as how to request burst buffer usage in jobs, are still being worked out. | Details, such as how to request burst buffer usage in jobs, are still being worked out. | ||
=Software= <!--T:18--> | ==Software== <!--T:18--> | ||
<!--T:19--> | <!--T:19--> | ||
* Module-based software stack. | * Module-based software stack. | ||
* Both the standard | * Both the standard Alliance software stack as well as cluster-specific software tuned for Niagara are available. | ||
* In contrast with Cedar and Graham, no modules are loaded by default to prevent accidental conflicts in versions. To load the software stack that a user would see on Graham and Cedar, one can load the "CCEnv" module (see [[Niagara Quickstart]]). | * In contrast with Cedar and Graham, no modules are loaded by default to prevent accidental conflicts in versions. To load the software stack that a user would see on Graham and Cedar, one can load the "CCEnv" module (see [[Niagara Quickstart]]). | ||
= Access to Niagara = <!--T:20--> | ==Access to Niagara== <!--T:20--> | ||
Access to Niagara is not enabled automatically for everyone with | Access to Niagara is not enabled automatically for everyone with an Alliance account, but anyone with an active Alliance account can get their access enabled. | ||
If you have an active | If you have an active Alliance account but you do not have access to Niagara yet (e.g. because you are a new user and belong to a group whose primary PI does not have an allocation as granted in the annual [https://alliancecan.ca/en/services/advanced-research-computing/accessing-resources/resource-allocation-competition Resource Allocation Competition]), go to the [https://ccdb.computecanada.ca/services/opt_in opt-in page on the CCDB site]. After clicking the "Join" button on that page, it usually takes only one or two business days for access to be granted. | ||
<!--T:27--> | <!--T:27--> | ||
If at any time you require assistance, please do not hesitate to [mailto:niagara@ | If at any time you require assistance, please do not hesitate to [mailto:niagara@tech.alliancecan.ca contact us]. | ||
== Getting started == <!--T:25--> | ===Getting started=== <!--T:25--> | ||
<!--T:26--> | <!--T:26--> | ||
Latest revision as of 17:45, 21 October 2024
| Availability: In production since April 2018 |
| Login node: niagara.alliancecan.ca |
| Globus endpoint: computecanada#niagara |
| Data mover nodes (rsync, scp, ...): nia-dm2, nia-dm2, see Moving data |
| System Status Page: https://docs.scinet.utoronto.ca |
| Portal : https://my.scinet.utoronto.ca |
Niagara is a homogeneous cluster, owned by the University of Toronto and operated by SciNet, intended to enable large parallel jobs of 1040 cores and more. It was designed to optimize throughput of a range of scientific codes running at scale, energy efficiency, and network and storage performance and capacity.
The Niagara Quickstart has specific instructions for Niagara, where the user experience on Niagara is similar to that on Graham and Cedar, but slightly different.
Preliminary documentation about the GPU expansion to Niagara called "Mist" can be found on the SciNet documentation site.
Niagara is an allocatable resource in the 2018 Resource Allocation Competition (RAC 2018), which has come into effect on April 4, 2018.
Niagara installation update at the SciNet User Group Meeting on February 14th, 2018
Niagara installation time-lag video
Niagara hardware specifications[edit]
- 2024 nodes, each with 40 Intel "Skylake" cores at 2.4 GHz or 40 Intel "CascadeLake" cores at 2.5 GHz, for a total of 80,640 cores.
- 202 GB (188 GiB) of RAM per node.
- EDR Infiniband network in a 'Dragonfly+' topology.
- 12.5PB of scratch, 3.5PB of project space (parallel filesystem: IBM Spectrum Scale, formerly known as GPFS).
- 256 TB burst buffer (Excelero + IBM Spectrum Scale).
- No local disks.
- No GPUs.
- Theoretical peak performance ("Rpeak") of 6.25 PF.
- Measured delivered performance ("Rmax") of 3.6 PF.
- 920 kW power consumption.
Attached storage systems[edit]
| Home 200TB Parallel high-performance filesystem (IBM Spectrum Scale) |
|
| Scratch 12.5PB (~100GB/s Write, ~120GB/s Read) Parallel high-performance filesystem (IBM Spectrum Scale) |
|
| Burst buffer 232TB (~90GB/s Write , ~154 GB/s Read) Parallel extra high-performance filesystem (Excelero+IBM Spectrum Scale) |
|
| Project 3.5PB (~100GB/s Write, ~120GB/s Read) Parallel high-performance filesystem (IBM Spectrum Scale |
|
| Archive 20PB High Performance Storage System (IBM HPSS) |
|
High-performance interconnect[edit]
The Niagara cluster has an EDR Infiniband network in a 'Dragonfly+' topology, with five wings. Each wing of maximually 432 nodes (i.e., 17280 cores) has 1-to-1 connections. Network traffic between wings is done through adaptive routing, which alleviates network congestion and yields an effective blocking of 2:1 between nodes of different wings.
Node characteristics[edit]
- CPU: 2 sockets with 20 Intel Skylake cores (2.4GHz, AVX512), for a total of 40 cores per node
- Computational performance: 3.07 TFlops theoretical peak.
- Network connection: 100Gb/s EDR Dragonfly+
- Memory: 202 GB (188 GiB) of RAM, i.e., a bit over 4GiB per core.
- Local disk: none. GPUs/Accelerators: none.
- Operating system: Linux CentOS 7
Scheduling[edit]
The Niagara cluster uses the Slurm scheduler to run jobs. The basic scheduling commands are therefore similar to those for Cedar and Graham, with a few differences:
- Scheduling is by node only. This means jobs always need to use multiples of 40 cores per job.
- Asking for specific amounts of memory is not be necessary and is discouraged; all nodes have the same amount of memory (202GB/188GiB minus some operating system overhead).
Details, such as how to request burst buffer usage in jobs, are still being worked out.
Software[edit]
- Module-based software stack.
- Both the standard Alliance software stack as well as cluster-specific software tuned for Niagara are available.
- In contrast with Cedar and Graham, no modules are loaded by default to prevent accidental conflicts in versions. To load the software stack that a user would see on Graham and Cedar, one can load the "CCEnv" module (see Niagara Quickstart).
Access to Niagara[edit]
Access to Niagara is not enabled automatically for everyone with an Alliance account, but anyone with an active Alliance account can get their access enabled.
If you have an active Alliance account but you do not have access to Niagara yet (e.g. because you are a new user and belong to a group whose primary PI does not have an allocation as granted in the annual Resource Allocation Competition), go to the opt-in page on the CCDB site. After clicking the "Join" button on that page, it usually takes only one or two business days for access to be granted.
If at any time you require assistance, please do not hesitate to contact us.
Getting started[edit]
Please read the Niagara Quickstart carefully.