Current System Load - CPU

The plot below shows the status of nodes on the current ARCHER2 Full System service. A description of each of the status types is provided below the plot.

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Note: the long running reservation visible in the plot corresponds to the short QoS which is used to support small, short jobs with fast turnaround time.

Current System Load - GPU

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Service Alerts

The ARCHER2 documentation also covers some Known Issues which users may encounter when using the system.

Status Type Start End Scope User Impact Reason
Planned Service Alert 2025-08-04 10:00 2025-08-07 10:00 Compute nodes Increased queue times and reduced node availability 1200 compute nodes reserved for testing of updated node image
Ongoing Issue 2025-06-25 13:00 Ongoing issues with /work1 file system An issue with the /work1 file system is currently being investigated. This is only impacting some jobs and examples of errors seen include Cannot read/write checkpoint; corrupt file, or maybe you are out of disk space. Under investigation

Maintenance Sessions

This section lists recent and upcoming maintenance sessions. A full list of past maintenance sessions is available.

Status Type Start End Scope User Impact Reason
Planned Full 2025-08-29 12:00 2025-09-15 12:00 Full ARCHER2 System Users will not be able to connect to ARCHER2 and will not be able to access data on any of the ARCHER2 file systems. The system will be drained of jobs ahead of the power outage and jobs will not run during this period. Any queued jobs will remain in the queue during the outage and jobs will start once the service is returned. SAFE and the ARCHER2 website will be available. Due to a significant Health and Safety risk, associated with our power supply to the site, action is required at the Advanced Computing Facility (ACF). There will be a full power outage to the site during this period. Specialised external contractors will be working on a 24/7 basis for the outage period replacing switchgear.

Previous Service Alerts

This section lists the five most recent resolved service alerts from the past 30 days. A full list of historical resolved service alerts is available.

Status Type Start End Scope User Impact Reason
Resolved Service Alert 2025-07-11 10:00 2025-07-14 08:00 Compute nodes Increased queue times and reduced node availability Update 2025-07014 All nodes have been returned to service. We are planning to remove a number of compute nodes to ensure cooling is adequate as higher temperatures are forecast in the Edinburgh area. Further details will be provided as they are available. We apologise for the inconvenience caused by longer queue times.
Resolved Service Alert 2025-07-09 15:30 2025-07-11 08:40 All parallel jobs launched using srun All parallel jobs launched using `srun` will have their IO profile captured by the Darshan IO profiling tool. In rare cases this may cause jobs to fail or impact performance. Users can disable Darshan by adding the line `module remove darshan` before they use `srun` in their job submission scripts. Capturing data on the IO use on ARCHER2 to improve the service.

System Status mailings

If you would like to receive email notifications about system issues and outages, please subscribe to the System Status Notifications mailing list via SAFE

FAQ

Usage statistics

This section contains data on ARCHER2 usage for Jul 2025. Access to historical usage data is available at the end of the section.

Usage by job size and length

Heatmap of usage job size versus job length

Queue length data

The colour indicates scheduling coefficient which is computed as [run time] divided by [run time + queue time]. A scheduling coefficient of 1 indicates that there was zero time queuing, a scheduling coefficient of 0.5 means that the job spent as long queuing as it did running.

Heatmap of scheduling coefficient job size versus job length

Software usage data

Plot and table of % use and job step size statistics for different software on ARCHER2 for Jul 2025. This data is also available as a CSV file.

Plot of usage by different software

This table shows job step size statistics in cores weighted by usage, total number of job steps and percent usage broken down by different software for Jul 2025.

Software Min Q1 Median Q3 Max Jobs Nodeh PercentUse Users Projects
Overall 1 512.0 1280.0 8192.0 262144 2723804 3933345.6 100.0 907 117
VASP 1 256.0 640.0 1024.0 16384 857992 799281.2 20.3 155 17
Unknown 1 512.0 1536.0 9216.0 99104 778285 717913.3 18.3 434 84
Nektar++ 1 5120.0 8192.0 12800.0 23040 783 296212.3 7.5 17 5
CP2K 1 512.0 720.0 1024.0 5120 63565 237985.9 6.1 61 13
No srun 1 256.0 1024.0 9216.0 262144 108342 229167.5 5.8 675 103
SENGA 1 8192.0 33500.0 33500.0 33500 198 192393.7 4.9 7 3
GROMACS 1 256.0 640.0 2048.0 12288 37975 163321.6 4.2 49 7
LAMMPS 1 128.0 256.0 1024.0 131072 106225 152546.9 3.9 56 18
OpenFOAM 1 1024.0 2048.0 4096.0 25600 2610 144009.2 3.7 55 17
Met Office UM 1 576.0 1024.0 1296.0 12544 13916 113859.9 2.9 45 6
Xcompact3d 128 32768.0 32768.0 32768.0 32768 91 92932.9 2.4 5 4
Python 1 9216.0 16384.0 16384.0 25600 42180 90739.9 2.3 63 26
FHI aims 1 384.0 512.0 1024.0 6000 20524 76286.2 1.9 28 5
CASTEP 1 128.0 256.0 512.0 8192 80845 66387.9 1.7 43 7
NEMO 1 768.0 5504.0 5504.0 6528 4094 53013.0 1.3 23 3
EDAMAME 1331 171475.0 171475.0 171475.0 171475 55 52585.5 1.3 2 1
ChemShell 1 1024.0 10752.0 12800.0 12800 2026 49848.1 1.3 15 5
OpenSBLI 64000 64000.0 64000.0 64000.0 131072 15 45114.4 1.1 2 2
iIMB 2048 2304.0 2304.0 9216.0 9216 76 34793.5 0.9 1 1
GENE 1 3584.0 8192.0 8192.0 10240 776 33501.2 0.9 15 3
PeleLMeX 16 512.0 2048.0 4096.0 8192 382 30876.4 0.8 3 1
ONETEP 4 128.0 128.0 128.0 128 698 29480.2 0.7 5 2
Code_Saturne 128 4096.0 4096.0 4608.0 16384 146 26459.1 0.7 9 4
Nek5000 6 65536.0 65536.0 65536.0 65536 62 25983.0 0.7 3 2
EPOCH 1 1152.0 1280.0 2304.0 16000 919 21691.8 0.6 7 2
MITgcm 2 112.0 126.0 356.0 384 24578 21060.1 0.5 10 2
Quantum Espresso 1 192.0 384.0 512.0 6400 10261 18334.3 0.5 34 10
GS2 128 2560.0 2560.0 2784.0 4096 9457 14572.0 0.4 5 2
Smilei 8 128.0 512.0 512.0 512 1780 12516.6 0.3 3 1
Hydro3D 30 2000.0 73440.0 73440.0 73440 86 11842.0 0.3 3 3
CESM 1 1536.0 1536.0 6400.0 6400 305 11252.3 0.3 4 1
CRYSTAL 128 128.0 512.0 512.0 2560 2487 10301.9 0.3 4 2
SIESTA 1 1280.0 2304.0 2304.0 2304 415 9061.3 0.2 4 2
VAMPIRE 128 1024.0 1024.0 1024.0 2048 369 6921.1 0.2 5 3
NWChem 16 128.0 128.0 384.0 512 547924 6132.9 0.2 9 5
ptau3d 32 200.0 240.0 400.0 400 33 5891.8 0.1 2 2
CASINO 128 640.0 640.0 1280.0 2560 61 4954.2 0.1 2 2
RMT 1 640.0 1024.0 2432.0 2560 258 4830.1 0.1 6 1
WRF 6 384.0 384.0 384.0 384 82 3763.5 0.1 4 1
NAMD 4 512.0 512.0 512.0 1536 233 2677.0 0.1 7 5
DL_POLY 64 512.0 640.0 1024.0 1152 188 2006.1 0.1 5 2
TPLS 480 2048.0 2048.0 2048.0 2048 17 1900.4 0.0 2 1
a.out 1 2048.0 2048.0 4096.0 4096 639 1883.9 0.0 10 6
FDS 248 248.0 248.0 248.0 248 34 1480.8 0.0 1 1
ECOGEN 256 512.0 1024.0 1024.0 1024 24 1295.5 0.0 2 2
PDNS3D 1024 1024.0 1024.0 1024.0 1024 69 1272.6 0.0 2 1
SU2 1280 6400.0 6400.0 6400.0 12800 3 1186.7 0.0 1 1
HYDRA 1 2560.0 3840.0 4480.0 4480 356 773.9 0.0 6 4
SBLI 512 1024.0 1024.0 1024.0 1024 51 388.5 0.0 1 1
BOUT++ 768 768.0 1344.0 1344.0 1344 5 172.2 0.0 1 1
ABINIT 40 320.0 320.0 320.0 640 19 156.8 0.0 1 1
ludwig 8 128.0 256.0 512.0 1024 218 130.7 0.0 1 1
HemeLB 8 512.0 1024.0 2304.0 4096 518 91.0 0.0 2 2
Arm Forge 1 128.0 256.0 512.0 1024 421 36.0 0.0 10 7
DL_MESO 128 128.0 128.0 128.0 128 7 31.6 0.0 1 1
AxiSEM3D 128 128.0 128.0 256.0 256 78 26.8 0.0 1 1
Amber 96 96.0 96.0 96.0 96 1 16.2 0.0 1 1
CloverLeaf 512 512.0 512.0 512.0 512 1 0.3 0.0 1 1
COSA 8 8.0 8.0 8.0 8 10 0.1 0.0 1 1
PRECISE 8 8.0 8.0 8.0 8 36 0.0 0.0 1 1

Historical usage data

Period Usage Heatmap Queue Heatmap Software usage plot Software usage data
Jul 2025 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jun 2025 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
May 2025 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Apr 2025 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Mar 2025 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Feb 2025 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jan 2025 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Dec 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Nov 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Oct 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Sep 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Aug 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jul 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jun 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
May 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Apr 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Mar 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Feb 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jan 2024 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Dec 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Nov 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Oct 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Sep 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Aug 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jul 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jun 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
May 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Apr 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Mar 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Feb 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jan 2023 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Dec 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Nov 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Oct 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Sep 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Aug 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jul 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jun 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
May 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Apr 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Mar 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Feb 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Jan 2022 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)
Dec 2021 Usage heatmap (PNG) Queue heatmap (PNG) Software usage plot (PNG) Software usage and size data (CSV)