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
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 2025-06-30 13:30 2025-06-30 21:00 Compute nodes Increased queue times and reduced node availability Update 2100 All nodes returned to service. Temperatures within cooling loop are good and the forecast will be fine over night. Update 1800 - 500 nodes remain out of service. 245 will be released at 2000 BST and 255 ndoes will be released at 2100 BST. A number of compute nodes will be removed from service to ensure cooling is adequate as higher temperatures are forecast in the Edinburgh area. The short queue is available. We apologise for the inconvenience caused by longer queue times.
Resolved Issue 2025-06-26 13:00 2025-06-26 13:40 Slurm controller restart between 13:00 and 14:00 The slurm controller will be restarted at some point between 13:00 and 14:00 today, 26/06/25 and will take approximately 10 minutes to complete. Whilst this is happening users will be unable to submit jobs or query job status. In order to try and resolve an ongoing issue
Resolved Service Alert 2025-06-25 08:00 2025-06-25 17:10 Compute nodes Increased queue times and reduced node availability. Possible intermittent issues with file system or internode communication due to change in interconnect topology while cabinets and switches are unavailable. Pump replacement on 3 cabinets which will be removed from service while pump replacement takes place.
Resolved Service Alert 2025-06-20 11:00 2025-06-23 08:30 40% - 50% Compute nodes Increased queue times and reduced node availability Update An issue was identified which caused the temperature to remain high. This has now been resolved and nodes are being returned to serivce. We have powered down 40% of compute nodes to ensure cooling is adequate due to unusually high temperatures in the Edinburgh area. We have placed a further 10% of compute nodes into maintenance mode. The maintenance will be lifted at 2200 on Saturday 21st June if cooling is at a good level. A further assessment will take place at 0900 on Sunday 22nd June and if possible nodes will be returned to service. We apologise for the inconvenience caused by longer queue times.
Resolved Service Alert 2025-06-05 10:00 2025-06-05 10:45 ARCHER2 Slurm scheduler ARCHER2 Slurm Controller will be restarted. Running jobs will continue to run, but Slurm commands will be unavailable for a few minutes. Update to the Slurm configuration.

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 Jun 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 Jun 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 Jun 2025.

Software Min Q1 Median Q3 Max Jobs Nodeh PercentUse Users Projects
Overall 1 512.0 1280.0 6400.0 131072 2364433 3896368.9 100.0 858 117
VASP 1 512.0 768.0 1024.0 38880 1481290 769848.2 19.8 151 16
Unknown 1 320.0 1024.0 6000.0 131072 291897 673945.1 17.3 406 90
No srun 1 1024.0 3840.0 25600.0 128000 60421 419461.3 10.8 679 96
LAMMPS 1 128.0 1408.0 3840.0 131072 60903 227924.9 5.8 48 17
Met Office UM 1 576.0 1296.0 6840.0 12544 25228 222653.3 5.7 41 5
Nektar++ 1 5120.0 8192.0 12800.0 131072 783 207827.2 5.3 13 4
SENGA 10 8192.0 33500.0 33500.0 33500 67 187453.7 4.8 6 3
CP2K 2 512.0 1024.0 1024.0 16384 73016 174349.1 4.5 56 14
GROMACS 1 256.0 512.0 2048.0 12288 47129 170524.4 4.4 45 5
OpenFOAM 1 640.0 1536.0 4096.0 25600 2289 93389.2 2.4 55 17
OpenSBLI 4096 64000.0 64000.0 64000.0 131072 32 83719.4 2.1 3 2
FHI aims 1 256.0 512.0 1024.0 3200 76587 83184.8 2.1 26 7
Python 1 2000.0 4096.0 9216.0 65536 168948 77423.6 2.0 57 25
CASTEP 4 256.0 512.0 2000.0 4200 9689 52826.8 1.4 36 6
Hydro3D 48 36040.0 36040.0 73440.0 79560 87 40622.9 1.0 4 3
ChemShell 1 256.0 1024.0 10368.0 12800 1934 38575.6 1.0 15 5
GENE 1 8192.0 10240.0 10240.0 10240 176 34099.7 0.9 7 4
iIMB 128 2304.0 2304.0 6400.0 9216 85 31832.0 0.8 2 2
Nek5000 2048 32768.0 65536.0 65536.0 65536 26 31171.4 0.8 3 2
EPOCH 128 2304.0 2304.0 2560.0 4096 716 27612.4 0.7 8 1
NEMO 1 480.0 1808.0 4352.0 8192 2171 26351.5 0.7 21 3
Quantum Espresso 4 384.0 512.0 512.0 4864 29303 20127.4 0.5 22 8
EDAMAME 1331 1331.0 6859.0 6859.0 6859 100 20026.8 0.5 2 1
MITgcm 80 112.0 126.0 240.0 384 22152 17913.6 0.5 12 4
ONETEP 1 128.0 128.0 128.0 512 1579 16328.2 0.4 8 3
WRF 1 384.0 384.0 384.0 483 321 15873.2 0.4 5 2
Code_Saturne 128 1024.0 3072.0 4096.0 8192 100 15237.4 0.4 6 2
Xcompact3d 256 3840.0 3840.0 32768.0 32768 107 14635.5 0.4 4 1
CRYSTAL 128 512.0 768.0 2048.0 2048 289 13898.3 0.4 4 2
PeleLMeX 4 512.0 512.0 512.0 2048 286 12561.8 0.3 4 1
NAMD 4 512.0 768.0 1536.0 2048 638 12555.6 0.3 7 5
CESM 1 1536.0 1920.0 6400.0 6656 200 11411.2 0.3 5 1
CASINO 16 1024.0 1024.0 1024.0 19200 107 9875.7 0.3 2 2
a.out 1 1152.0 8192.0 12288.0 16384 721 8715.1 0.2 11 7
HYDRA 1 3840.0 3840.0 4480.0 4480 67 6578.5 0.2 9 7
VAMPIRE 128 1024.0 1024.0 8192.0 8192 304 6015.8 0.2 5 2
GS2 320 1280.0 1280.0 2784.0 4096 2347 3980.7 0.1 4 2
RMT 128 1280.0 1408.0 2560.0 2560 70 2458.1 0.1 3 1
TPLS 64 1024.0 2048.0 2048.0 2048 124 2229.4 0.1 3 1
ptau3d 8 160.0 400.0 400.0 512 241 1964.6 0.1 4 2
BOUT++ 1344 1344.0 1344.0 1344.0 1344 7 1549.0 0.0 1 1
SIESTA 1 2304.0 2304.0 2304.0 2304 230 1456.7 0.0 4 3
NWChem 16 128.0 512.0 512.0 1024 619 1212.8 0.0 12 7
Amber 64 96.0 128.0 128.0 768 44 1046.8 0.0 2 1
PDNS3D 1024 1024.0 1024.0 1024.0 1024 42 941.7 0.0 2 1
HemeLB 4 768.0 1280.0 2048.0 4096 147 707.9 0.0 3 3
Smilei 8 128.0 256.0 256.0 512 65 483.8 0.0 3 1
DL_POLY 1 512.0 512.0 512.0 512 23 449.7 0.0 2 1
SPECFEM3D 4 600.0 600.0 600.0 600 22 387.5 0.0 1 1
SBLI 1024 1024.0 1024.0 1024.0 1024 40 333.1 0.0 1 1
PRECISE 8 1920.0 1920.0 1920.0 1920 22 210.1 0.0 2 2
SU2 128 1280.0 1280.0 1280.0 1280 23 193.3 0.0 1 1
Arm Forge 1 128.0 256.0 512.0 2048 481 175.7 0.0 6 5
ABINIT 64 64.0 64.0 64.0 128 12 11.5 0.0 2 2
ludwig 8 128.0 256.0 256.0 256 48 10.3 0.0 1 1
DL_MESO 64 64.0 64.0 64.0 64 4 6.0 0.0 1 1
AxiSEM3D 4 128.0 128.0 128.0 128 43 5.7 0.0 2 1
FVCOM 16 16.0 16.0 16.0 16 20 3.0 0.0 1 1
CloverLeaf 128 128.0 256.0 512.0 1024 11 0.9 0.0 1 2

Historical usage data

Period Usage Heatmap Queue Heatmap Software usage plot Software usage data
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)