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 2025-05-20 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
Resolved Service Alert 2025-05-05 09:00 2025-05-05 15:30 ARCHER2 compute nodes Update: Issue is now resolved and maintenance removed from system. HPE bringining the four cabinets back which had been impacted. Some ARCHER2 compute nodes are not available while investigations take place. Users can connect to login nodes and can access data. No new jobs will start. There is an issue with the cooling on ARCHER2.

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 Apr 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 Apr 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 Apr 2025.

Software Min Q1 Median Q3 Max Jobs Nodeh PercentUse Users Projects
Overall 1 512.0 1344.0 6144.0 524288 1108954 3933431.6 100.0 901 129
VASP 1 256.0 1024.0 1536.0 38880 71386 897194.4 22.8 140 15
Unknown 1 512.0 2048.0 6400.0 112500 459092 770578.1 19.6 439 99
GROMACS 1 1024.0 1920.0 2304.0 32768 14191 217271.4 5.5 46 8
Met Office UM 1 1024.0 1296.0 12544.0 12544 39987 210203.9 5.3 37 4
Nektar++ 1 5120.0 6400.0 8960.0 28160 1156 190837.2 4.9 15 4
No srun 1 512.0 2560.0 12288.0 524288 78066 184589.0 4.7 646 101
OpenFOAM 1 512.0 2048.0 7680.0 93750 8817 171084.2 4.3 52 19
CP2K 1 256.0 512.0 1024.0 2048 40921 161750.7 4.1 47 13
Python 1 1792.0 1792.0 9216.0 25600 27137 155682.8 4.0 56 28
Code_Saturne 4 4608.0 65536.0 131072.0 524288 192 103688.4 2.6 4 2
LAMMPS 1 128.0 1536.0 6400.0 131072 26288 101428.6 2.6 48 14
CASTEP 4 152.0 384.0 1440.0 64000 126382 76739.7 2.0 40 7
FHI aims 1 384.0 512.0 2875.0 4250 107134 71712.9 1.8 23 5
SENGA 128 4096.0 4096.0 33500.0 33500 215 71403.0 1.8 7 4
Quantum Espresso 1 256.0 256.0 384.0 4608 19149 61478.9 1.6 41 11
Xcompact3d 1 2048.0 2048.0 32768.0 32768 1346 52695.5 1.3 8 4
NEMO 1 1808.0 2912.0 5504.0 10080 3973 41802.4 1.1 22 3
EPOCH 128 1024.0 2304.0 5120.0 7168 737 33562.8 0.9 7 1
iIMB 128 6400.0 6400.0 6400.0 6400 43 32374.5 0.8 2 2
GENE 1 4096.0 4096.0 8192.0 8192 336 29871.7 0.8 6 3
CASINO 76 1024.0 1024.0 1024.0 2048 234 29777.1 0.8 1 1
MITgcm 96 126.0 256.0 624.0 1920 38054 27326.9 0.7 12 3
RMT 16 1280.0 1280.0 1280.0 2048 323 23796.0 0.6 5 1
ChemShell 1 1024.0 1024.0 1024.0 1280 637 23160.4 0.6 8 3
a.out 1 1280.0 8192.0 16384.0 16384 1888 20662.8 0.5 14 9
CESM 1 1536.0 6784.0 6784.0 7680 511 20424.8 0.5 10 1
Smilei 1 128.0 128.0 512.0 512 494 19284.7 0.5 5 1
WRF 1 384.0 384.0 384.0 384 86 18426.6 0.5 3 2
BOUT++ 768 1344.0 1344.0 1344.0 1344 83 16885.7 0.4 1 1
ONETEP 1 128.0 150.0 150.0 1344 2499 16240.3 0.4 7 2
NAMD 32 512.0 512.0 1024.0 16384 4723 15862.5 0.4 4 3
VAMPIRE 128 512.0 512.0 1024.0 2048 487 9590.5 0.2 6 3
EDAMAME 1331 6859.0 6859.0 6859.0 6859 11 8062.0 0.2 2 1
SIESTA 4 960.0 2304.0 2304.0 2304 1133 7870.0 0.2 5 3
PRECISE 512 1920.0 1920.0 1920.0 1920 47 6575.6 0.2 1 1
Hydro3D 8 7000.0 7000.0 7000.0 8840 252 5872.8 0.1 4 3
OpenSBLI 128 64000.0 64000.0 64000.0 131072 14 4749.3 0.1 4 3
CRYSTAL 128 1024.0 1536.0 1536.0 1536 304 3967.4 0.1 3 2
NWChem 2 256.0 384.0 384.0 2048 26142 3731.4 0.1 9 5
PDNS3D 1024 1024.0 1024.0 1024.0 16384 66 2986.1 0.1 2 1
GS2 512 1280.0 1280.0 1280.0 2560 2464 2647.3 0.1 3 2
Nek5000 512 1536.0 2048.0 2048.0 6144 25 2460.8 0.1 2 1
FDS 248 384.0 384.0 384.0 384 32 2019.9 0.1 1 1
ptau3d 4 160.0 160.0 160.0 160 129 1329.6 0.0 5 2
HemeLB 256 256.0 1024.0 1024.0 2304 21 1015.0 0.0 2 2
TPLS 64 2048.0 2048.0 2048.0 2048 40 769.4 0.0 2 1
SU2 256 1920.0 1920.0 1920.0 1920 4 720.3 0.0 1 1
SBLI 128 1024.0 1024.0 1024.0 2048 96 405.6 0.0 2 2
PeleLMeX 128 256.0 256.0 512.0 1024 54 327.4 0.0 2 1
CPMD 128 128.0 128.0 128.0 128 38 255.4 0.0 1 1
FVCOM 128 384.0 384.0 384.0 384 23 132.3 0.0 2 1
DL_POLY 8 32.0 32.0 32.0 128 28 41.8 0.0 2 2
Arm Forge 1 496.0 512.0 512.0 512 167 40.2 0.0 12 10
DL_MESO 128 128.0 128.0 128.0 128 3 24.0 0.0 1 1
HYDRA 1 2.0 4.0 4.0 16 1139 16.9 0.0 8 5
Amber 96 96.0 96.0 96.0 96 1 16.0 0.0 1 1
ludwig 2 512.0 512.0 512.0 512 153 6.5 0.0 2 2
GPAW 64 64.0 64.0 64.0 64 1 0.0 0.0 1 1

Historical usage data

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