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.

No current service alerts

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 2025-06-05 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.
Resolved Service Alert 2025-05-20 11:06 2025-05-20 11:21 Login, compute, GPU and serial nodes, a2fs-work4 file system Login access may have stalled, loading modules may have failed on nodes or in jobs. Reading or writing data to a2fs-work4 Lustre file system may have failed. Hardware issue on a2fs-work4 file system

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 May 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 May 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 May 2025.

Software Min Q1 Median Q3 Max Jobs Nodeh PercentUse Users Projects
Overall 1 576.0 2048.0 6500.0 524288 1284694 4449322.2 100.0 887 129
Unknown 1 600.0 2816.0 6000.0 99104 556969 822754.8 18.5 411 100
VASP 1 512.0 1024.0 1280.0 10240 70374 772565.3 17.4 160 17
Nektar++ 1 6400.0 8192.0 20480.0 64000 1074 312503.3 7.0 14 4
No srun 1 1536.0 6400.0 23040.0 524288 49631 310376.6 7.0 656 100
SENGA 10 5120.0 33500.0 33500.0 33500 218 222929.4 5.0 7 3
GROMACS 1 1024.0 2048.0 2560.0 12288 11797 217634.5 4.9 44 6
Met Office UM 1 1024.0 1296.0 6165.0 12544 28063 202134.9 4.5 42 5
LAMMPS 1 128.0 1536.0 3840.0 131072 66700 190865.3 4.3 51 16
CP2K 1 256.0 512.0 1024.0 3072 63673 175080.9 3.9 47 13
OpenFOAM 1 512.0 2048.0 5120.0 93750 3462 160177.4 3.6 52 18
Python 1 4096.0 4096.0 9216.0 32768 103279 134839.7 3.0 64 28
FHI aims 1 512.0 1024.0 5375.0 6875 58548 107131.5 2.4 26 6
CASTEP 16 152.0 512.0 1440.0 4096 8922 84070.1 1.9 42 7
OpenSBLI 128 25600.0 25600.0 64000.0 131072 129 73212.3 1.6 4 3
Xcompact3d 128 2048.0 32768.0 32768.0 32768 1194 58040.1 1.3 8 3
Quantum Espresso 4 256.0 512.0 512.0 6144 15252 56050.1 1.3 26 10
ChemShell 1 1024.0 5760.0 12800.0 12800 1042 55008.7 1.2 10 4
VAMPIRE 24 16384.0 65536.0 65536.0 65536 458 48036.0 1.1 6 2
Code_Saturne 1 4096.0 524288.0 524288.0 524288 82 44560.7 1.0 6 3
CRYSTAL 1 1024.0 131072.0 131072.0 131072 185 39920.7 0.9 3 3
iIMB 128 2048.0 2304.0 6400.0 6400 90 31838.8 0.7 2 2
CASINO 128 1024.0 1024.0 2048.0 2048 347 26188.9 0.6 2 2
ONETEP 1 128.0 128.0 150.0 2112 1772 25370.6 0.6 6 1
Smilei 1 512.0 512.0 512.0 768 201 24453.4 0.5 4 1
MITgcm 18 112.0 126.0 384.0 3072 20651 23269.6 0.5 13 3
SIESTA 1 2304.0 2304.0 2304.0 2304 353 22323.3 0.5 2 1
NAMD 4 512.0 640.0 768.0 4096 6879 20778.2 0.5 7 4
EDAMAME 64 6859.0 6859.0 6859.0 6859 103 20704.7 0.5 2 1
SU2 1280 6400.0 6400.0 6400.0 12800 25 16477.0 0.4 1 1
Nek5000 4 2048.0 4096.0 8192.0 32768 127 16157.1 0.4 3 2
NEMO 1 340.0 480.0 1320.0 8192 4007 14815.2 0.3 22 4
WRF 1 384.0 384.0 384.0 384 159 14531.5 0.3 4 2
CESM 1 3840.0 6656.0 6656.0 6784 344 12824.3 0.3 6 1
BOUT++ 1344 1344.0 1344.0 1344.0 1344 52 11524.9 0.3 1 1
PRECISE 8 1920.0 1920.0 1920.0 1920 76 10387.6 0.2 2 2
PeleLMeX 128 512.0 512.0 512.0 1536 140 10345.3 0.2 2 1
GS2 256 1280.0 1280.0 1280.0 1664 8405 9681.6 0.2 3 1
EPOCH 128 512.0 2304.0 2304.0 3840 409 9131.2 0.2 9 1
HYDRA 1 3840.0 3840.0 3840.0 4480 127 8252.1 0.2 8 6
GENE 1 8192.0 8192.0 8192.0 8192 118 7510.5 0.2 10 3
a.out 1 256.0 1280.0 4096.0 8192 1998 6657.1 0.1 7 4
RMT 640 640.0 1152.0 1280.0 5120 193 3783.2 0.1 3 1
Hydro3D 9 468.0 1440.0 1830.0 32640 159 2778.7 0.1 3 2
NWChem 1 128.0 128.0 1024.0 1024 196220 2478.3 0.1 9 5
TPLS 1 4096.0 4096.0 4096.0 4096 91 2291.6 0.1 2 1
Amber 8 640.0 768.0 768.0 1536 43 1898.4 0.0 3 2
PDNS3D 1024 1024.0 1024.0 1024.0 1024 24 1633.6 0.0 1 1
HemeLB 256 1024.0 1024.0 1024.0 1024 26 869.3 0.0 2 1
FDS 248 384.0 384.0 384.0 384 14 864.2 0.0 1 1
SBLI 128 1024.0 1024.0 1024.0 2048 30 512.3 0.0 1 1
ptau3d 8 160.0 400.0 400.0 400 42 462.4 0.0 3 1
CPMD 128 128.0 128.0 128.0 128 24 195.3 0.0 1 1
ABINIT 128 128.0 128.0 128.0 128 32 168.8 0.0 1 1
FVCOM 16 128.0 384.0 384.0 384 35 136.4 0.0 3 2
DL_POLY 16 32.0 32.0 32.0 32 55 45.3 0.0 1 1
OSIRIS 512 512.0 512.0 512.0 512 1 41.7 0.0 1 1
Arm Forge 1 96.0 192.0 496.0 1280 197 40.2 0.0 15 10
ludwig 8 512.0 512.0 512.0 512 63 3.9 0.0 2 2
DL_MESO 128 128.0 128.0 128.0 128 1 2.7 0.0 1 1
AxiSEM3D 128 128.0 128.0 128.0 128 9 0.8 0.0 1 1

Historical usage data

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