# Underhill

> Canadian supercomputer

**Wikidata**: [Q122984370](https://www.wikidata.org/wiki/Q122984370)  
**Source**: https://4ort.xyz/entity/underhill

## Summary
Underhill is a Canadian supercomputer that began operation in 2022. Manufactured by Lenovo and sponsored by Shared Services Canada, it is used for government programs. The system operates on Linux and is notable for its performance, which has consistently placed it on the TOP500 list of the world's most powerful supercomputers.

## Key Facts
- **Instance of:** Supercomputer
- **Country:** Canada
- **Inception:** 2022
- **Manufacturer:** Lenovo
- **Sponsor:** Shared Services Canada
- **CPU:** Xeon Platinum 8380 40C with a clock speed of 2.3GHz
- **Total Processor Cores:** 148,320
- **Performance (Rmax):** 7.76 petaflops
- **TOP500 Ranking:** Ranked 102nd as of November 2023.
- **Operating System:** Linux

## FAQs
### Q: What is the Underhill supercomputer?
A: Underhill is a supercomputer located in Canada, established in 2022. It is a Lenovo-built system sponsored by Shared Services Canada for use in government programs.

### Q: How powerful is Underhill?
A: Underhill has a maximum achieved performance (Rmax) of 7.76 petaflops and a theoretical peak performance (Rpeak) of 10.92 petaflops. As of November 2023, it was ranked the 102nd most powerful supercomputer in the world on the TOP500 list.

### Q: Who built and operates the Underhill supercomputer?
A: The Underhill supercomputer was manufactured by the multinational technology company Lenovo. It is sponsored by Shared Services Canada, a department of the Canadian government.

## Why It Matters
Underhill represents a significant computational resource for the Canadian government. As a high-ranking system on the global TOP500 list, its existence underscores Canada's investment in high-performance computing for governmental applications. Sponsored by Shared Services Canada, Underhill provides the necessary power for complex simulations, data analysis, and other computationally intensive tasks required by various government programs.

The system's architecture, built by Lenovo using high-core-count Intel Xeon processors and a high-speed InfiniBand interconnect, is designed for large-scale, parallel processing tasks. Its substantial power consumption and large number of processor cores are indicative of its capacity to tackle complex problems. Underhill's consistent presence on the TOP500 list since its debut in 2022 highlights its role as a key piece of national IT infrastructure.

## Notable For
- **TOP500 Ranking:** Underhill has been consistently ranked among the world's most powerful supercomputers, debuting at 69th in June 2022 and ranking 102nd as of November 2023.
- **Government Sponsorship:** It is a key computational asset for the Canadian government, sponsored by Shared Services Canada for use in government programs.
- **Massive Core Count:** The system is equipped with 148,320 processor cores, enabling massively parallel computing tasks.
- **Specific Hardware:** It is built on Lenovo's ThinkSystem SD650 V2 platform, utilizing Xeon Platinum 8380 40C CPUs and an InfiniBand HDR interconnect for high-speed data transfer between nodes.

## Body
### Overview and Purpose
Underhill is a supercomputer located in Canada that was first operational in 2022. It is an instance of a Lenovo ThinkSystem SD650 V2. The system is sponsored by Shared Services Canada and is utilized within the government program industry. Its official TOP500 system ID is 180081.

### Technical Specifications
- **Manufacturer:** Lenovo
- **Operating System:** Linux
- **Processor:** The system uses Xeon Platinum 8380 40C CPUs with a clock speed of 2.3GHz.
- **Core Count:** The total number of processor cores is 148,320.
- **Interconnect:** It uses InfiniBand for its system bus.
- **Power Consumption:** The system consumes 1294.72 kilowatts of power.

### Performance and Ranking
Underhill's performance is measured in petaflops. Its theoretical peak performance (Rpeak) is 10.92 petaflops, while its maximum performance achieved on the LINPACK benchmark (Rmax) is 7.76 petaflops.

Its ranking on the TOP500 list has been recorded as follows:
- **June 2022:** 69th
- **November 2022:** 76th
- **June 2023:** 85th
- **November 2023:** 102nd

## References

1. [TOP500](https://top500.org/system/180081/)
2. [Source](https://www.top500.org/site/50719/)