- Current System Load - CPU, GPU
- Service Alerts
- Maintenance Sessions
- Previous Service Alerts
- System Status Mailings
- FAQ
- Usage statistics
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.
- alloc: Nodes running user jobs
- idle: Nodes available for user jobs
- resv: Nodes in reservation and not available for standard user jobs
- plnd: Nodes are planned to be used for a future jobs. If pending jobs can fit in the space before the future job is due to start they can run on these nodes (often referred to as backfilling).
- down, drain, maint, drng, comp, boot: Nodes unavailable for user jobs
- mix: Nodes in multiple states
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
- alloc: Nodes running user jobs
- idle: Nodes available for user jobs
- resv: Nodes in reservation and not available for standard user jobs
- plnd: Nodes are planned to be used for a future jobs. If pending jobs can fit in the space before the future job is due to start they can run on these nodes (often referred to as backfilling).
- down, drain, maint, drng, comp, boot: Nodes unavailable for user jobs
- mix: Nodes in multiple states
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 | 2025-12-10 08:00 | Mains power supply to systems at ACF. | Low risk of loss of mains power to ACF systems. | Essential maintenance to ACF high voltage switchgear to resolve what is believed to be a minor issue with voltage transformation found during detailed checks after the replacement earlier this year. | |
| Planned | Service Alert | 2025-10-16 00:00 | License server availability | There will be an interruption to license server availability of up to two hours - time TBC | License server work |
Maintenance Sessions
This section lists recent and upcoming maintenance sessions. A full list of past maintenance sessions is available.
No scheduled or recent maintenance sessions
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 | 2025-11-03 09:00 | 2025-11-14 18:00 | RDFaaS | Risk of unexpected I/O performance issues with RDFaaS | Commissioning/testing of new Cirrus hardware sharing same file system as RDFaaS |
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 Nov 2025. Access to historical usage data is available at the end of the section.
Usage by job size and 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.
Software usage data
Plot and table of % use and job step size statistics for different software on ARCHER2 for Nov 2025. This data is also available as a CSV file.
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 Nov 2025.
| Software | Min | Q1 | Median | Q3 | Max | Jobs | Nodeh | PercentUse | Users | Projects |
|---|---|---|---|---|---|---|---|---|---|---|
| Overall | 0 | 512.0 | 1152.0 | 4992.0 | 524288 | 2352361 | 3956901.3 | 100.0 | 1012 | 125 |
| Unknown | 1 | 400.0 | 2048.0 | 6400.0 | 340540 | 1161658 | 793142.8 | 20.0 | 563 | 93 |
| VASP | 1 | 384.0 | 512.0 | 1280.0 | 11520 | 146379 | 598624.9 | 15.1 | 153 | 17 |
| No srun | 0 | 512.0 | 2048.0 | 8192.0 | 524288 | 85046 | 333493.3 | 8.4 | 782 | 105 |
| LAMMPS | 1 | 128.0 | 512.0 | 1024.0 | 131072 | 58849 | 322095.1 | 8.1 | 57 | 22 |
| Met Office UM | 1 | 576.0 | 1152.0 | 6165.0 | 12544 | 24977 | 217630.9 | 5.5 | 49 | 5 |
| GROMACS | 1 | 512.0 | 1024.0 | 1280.0 | 5120 | 41887 | 189845.8 | 4.8 | 37 | 7 |
| SENGA | 1 | 5120.0 | 8192.0 | 8192.0 | 8192 | 143 | 186153.2 | 4.7 | 4 | 2 |
| OpenSBLI | 25600 | 25600.0 | 64000.0 | 64000.0 | 131072 | 44 | 185604.5 | 4.7 | 4 | 3 |
| OpenFOAM | 1 | 512.0 | 1024.0 | 3072.0 | 25600 | 11149 | 180403.1 | 4.6 | 57 | 23 |
| Nektar++ | 10 | 5120.0 | 8192.0 | 8192.0 | 10240 | 511 | 145417.6 | 3.7 | 9 | 3 |
| CASTEP | 1 | 256.0 | 384.0 | 768.0 | 9216 | 46265 | 114128.6 | 2.9 | 36 | 5 |
| CP2K | 1 | 512.0 | 768.0 | 1024.0 | 4096 | 41849 | 111094.7 | 2.8 | 42 | 11 |
| FHI aims | 1 | 512.0 | 1024.0 | 1280.0 | 8192 | 28893 | 95807.8 | 2.4 | 32 | 6 |
| CRYSTAL | 8 | 512.0 | 768.0 | 768.0 | 3840 | 3391 | 55454.6 | 1.4 | 7 | 2 |
| Python | 1 | 512.0 | 1024.0 | 4096.0 | 16384 | 210301 | 53589.2 | 1.4 | 52 | 21 |
| NEMO | 1 | 768.0 | 5472.0 | 5472.0 | 10080 | 262587 | 40341.1 | 1.0 | 20 | 4 |
| iIMB | 128 | 2304.0 | 2304.0 | 2304.0 | 2304 | 305 | 31930.5 | 0.8 | 1 | 1 |
| Quantum Espresso | 1 | 256.0 | 1024.0 | 1792.0 | 4400 | 8059 | 29943.2 | 0.8 | 28 | 5 |
| EPOCH | 1 | 1024.0 | 1280.0 | 8192.0 | 9216 | 921 | 29610.1 | 0.7 | 9 | 1 |
| NAMD | 4 | 512.0 | 512.0 | 512.0 | 2304 | 5856 | 29017.6 | 0.7 | 8 | 5 |
| ChemShell | 1 | 128.0 | 1024.0 | 12800.0 | 12800 | 5465 | 27712.3 | 0.7 | 18 | 5 |
| MITgcm | 1 | 112.0 | 240.0 | 384.0 | 3072 | 29785 | 26231.6 | 0.7 | 14 | 2 |
| Nek5000 | 128 | 2048.0 | 32768.0 | 32768.0 | 32768 | 90 | 19581.4 | 0.5 | 4 | 2 |
| VAMPIRE | 128 | 1024.0 | 1024.0 | 2048.0 | 2048 | 505 | 16363.1 | 0.4 | 6 | 2 |
| PeleLMeX | 128 | 2048.0 | 8192.0 | 8192.0 | 8192 | 32 | 14722.1 | 0.4 | 4 | 1 |
| Code_Saturne | 2 | 768.0 | 2048.0 | 4096.0 | 32768 | 174 | 14089.3 | 0.4 | 5 | 2 |
| ptau3d | 2 | 200.0 | 200.0 | 600.0 | 1600 | 227 | 12897.2 | 0.3 | 3 | 2 |
| SIESTA | 1 | 2304.0 | 2304.0 | 2304.0 | 2304 | 642 | 10382.8 | 0.3 | 4 | 2 |
| GS2 | 64 | 2064.0 | 2064.0 | 2064.0 | 2064 | 181 | 9283.4 | 0.2 | 3 | 2 |
| GENE | 1 | 3584.0 | 8192.0 | 8192.0 | 8192 | 611 | 9120.3 | 0.2 | 9 | 3 |
| GAMESS | 128 | 128.0 | 128.0 | 128.0 | 128 | 124 | 9078.1 | 0.2 | 2 | 1 |
| TPLS | 128 | 1024.0 | 2048.0 | 4096.0 | 4096 | 283 | 8507.4 | 0.2 | 2 | 1 |
| a.out | 1 | 1152.0 | 1152.0 | 1152.0 | 4096 | 2409 | 5872.3 | 0.1 | 22 | 11 |
| FDS | 248 | 248.0 | 440.0 | 440.0 | 708 | 96 | 5018.6 | 0.1 | 1 | 1 |
| ludwig | 2 | 256.0 | 512.0 | 512.0 | 512 | 2043 | 4429.6 | 0.1 | 2 | 2 |
| NWChem | 1 | 128.0 | 128.0 | 384.0 | 2560 | 162759 | 4026.6 | 0.1 | 13 | 6 |
| WRF | 2 | 384.0 | 384.0 | 384.0 | 384 | 110 | 3503.6 | 0.1 | 6 | 3 |
| Hydro3D | 100 | 600.0 | 600.0 | 900.0 | 2000 | 119 | 3159.5 | 0.1 | 2 | 2 |
| Smilei | 32 | 128.0 | 128.0 | 128.0 | 128 | 23 | 1714.6 | 0.0 | 2 | 1 |
| ECOGEN | 1024 | 1024.0 | 3072.0 | 3072.0 | 3072 | 15 | 1590.0 | 0.0 | 1 | 1 |
| CESM | 1 | 128.0 | 512.0 | 512.0 | 1024 | 208 | 1562.5 | 0.0 | 7 | 2 |
| RMT | 512 | 1664.0 | 1664.0 | 1664.0 | 1664 | 65 | 1242.2 | 0.0 | 3 | 1 |
| OSIRIS | 1024 | 1024.0 | 1024.0 | 1024.0 | 1024 | 5 | 1212.7 | 0.0 | 1 | 1 |
| HYDRA | 1 | 4.0 | 8.0 | 8.0 | 1024 | 6570 | 646.0 | 0.0 | 10 | 6 |
| HemeLB | 64 | 768.0 | 1024.0 | 1024.0 | 2304 | 25 | 640.4 | 0.0 | 1 | 1 |
| AxiSEM3D | 64 | 480.0 | 480.0 | 480.0 | 960 | 42 | 415.1 | 0.0 | 2 | 1 |
| DL_POLY | 512 | 512.0 | 512.0 | 512.0 | 512 | 1 | 187.8 | 0.0 | 1 | 1 |
| ONETEP | 1 | 32.0 | 32.0 | 80.0 | 128 | 422 | 182.8 | 0.0 | 5 | 2 |
| Amber | 4 | 8.0 | 8.0 | 8.0 | 8 | 112 | 112.2 | 0.0 | 1 | 1 |
| DL_MESO | 128 | 128.0 | 128.0 | 128.0 | 128 | 3 | 48.0 | 0.0 | 1 | 1 |
| Arm Forge | 1 | 768.0 | 1280.0 | 1280.0 | 1280 | 73 | 30.5 | 0.0 | 11 | 10 |
| PDNS3D | 256 | 1024.0 | 1024.0 | 1024.0 | 1024 | 26 | 8.7 | 0.0 | 2 | 1 |
| SBLI | 64 | 64.0 | 64.0 | 64.0 | 64 | 1 | 0.0 | 0.0 | 1 | 1 |
| PRECISE | 1 | 2.0 | 8.0 | 8.0 | 8 | 45 | 0.0 | 0.0 | 1 | 1 |
