Credit Account Charges¶
This page describes the specific credit charges for certain resources on the PATh Facility. For details on how to request credits for your project, see Request PATh Facility Credits
Credits may be requested and used under the CPU Credit category or the GPU Credit category. Credits are specific to each node type – CPU Credits are not transferable to GPU Credits, and vice-versa. CPU Credit charges are defined by a combination of per-job cores and memory request, while GPU Credit charges are defined by a combination of per-job GPU, CPU, and memory request.
CPU Credits¶
| Cores per job | Credit charge per core hour |
|---|---|
| 1 | 1.0 |
| 2-8 | 1.2 |
| 8-32 | 1.5 |
| >32 | 2.0 |
When running on a resource with hyperthreaded cores, a 40% discount is applied; e.g., 1 hyperthreaded core for 1 hour costs 0.6 credits.
Additional CPU Credit Charge¶
Memory Per Core¶
When more than 2GB per core of memory is requested by the job, there’s an additional per-GB charge for memory.
| Memory (GB) per job | Credit charge per hour, per GB |
|---|---|
| Up to 2GB per core ("nominal") | No charge |
| 2-8 GB greater then nominal | 0.125 |
| 8-32 | 0.25 |
| 32-128 | 0.375 |
| 128-512 | 0.50 |
CPU Credit Example¶
If an 8 core job requests 128 GB of RAM, there is an additional charge for 128 – (8 * 2) = 112 GB of RAM. If the job ran for an hour, it would use 0.375 * 112 = 42 credits total for memory and 1.2 * 8 = 9.6 credits for CPU.
GPU Credits¶
| GPUs per job | Credit charge per GPU hour |
|---|---|
| 1 | 1.0 |
| 2 | 1.2 |
| 3 | 1.5 |
| 4 | 2.0 |
Additional GPU Credit Charge¶
CPUS per GPU¶
When more than 16 cores per GPU is requested by the job, there’s an additional per-core charge for the CPU cores beyond the nominal.
| CPUs per GPU | Credit charge per hour, per core |
|---|---|
| Up to 16 cores per GPU ("nominal") | No charge |
| 16-48 cores per GPU | 0.125 |
| 48-64 | 0.20 |
Memory per GPU¶
When more than 2 GB per core of memory is requested by the job, there’s an additional per-GB charge for memory for the beyond-nominal memory usage.
| Memory (GB) per job | Credit charge per hour, per GB |
|---|---|
| Up to 128GB per GPU ("nominal") | No charge |
| 128-384 GB per GPU | 0.012 |
| 384-512 | 0.020 |
GPU Credit Example¶
If a 1 GPU job requests 256 GB of RAM and 32 cores, there is an additional charge for 256 – (1 * 128) = 128 GB of RAM and an additional charge for 32 – (1 * 16) = 16 cores. If the job ran for an hour, it would use 0.012 * 128 = 1.536 credits total for memory, 0.125 * 16 = 2 credits for CPU, and 1.0 * 1 = 1.0 credits for GPU.