Simulation results
ElastiSim provides detailed results after each simulated scenario as comma-separated value (CSV) files. By enabling the monitoring module and setting a sensing interval (see Configuration), users gain deeper insight into the utilization of the platform. This page describes the available columns in each CSV file.
Job statistics
The job statistics file provides the results of each job in the simulated scenario. Each row corresponds to one job.
| Columns | Value type | Description |
|---|---|---|
| ID | integer | see Scheduling interface |
| Type | string | see Job |
| Submit Time | float (seconds) | see Job |
| Start Time | float (seconds) | see Scheduling interface |
| End Time | float (seconds) | see Scheduling interface |
| Wait Time | float (seconds) | see Scheduling interface |
| Makespan | float (seconds) | see Scheduling interface |
| Turnaround Time | float (seconds) | see Scheduling interface |
| Status | string | Whether the job completed gracefully or was killed ("completed" or killed) |
Node utilization
The node utilization file provides insights into node state changes during the simulation. Each row describes a change of state and its corresponding node.
| Columns | Value type | Description |
|---|---|---|
| Time | float (seconds) | Time (absolute) of node state change |
| Node | string | Node name |
| State | string | Node state |
| Running jobs | string | IDs of running jobs separated by a semicolon |
| Expected jobs | string | IDs of expected jobs separated by a semicolon |
CPU utilization
CPU utilization requires active monitoring.
The monitoring module measures CPU utilization per node. The column count in the resulting CSV file depends on the number of compute nodes.
| Columns | Value type | Description |
|---|---|---|
| Time | float (seconds) | Time (absolute) |
<Node_0> | float (percentage, [0,1]) | CPU utilization |
| … | … | … |
<Node_n> | float (percentage, [0,1]) | CPU utilization |
Values represent the utilization of the compute node’s total computational power. As CPU workloads fully utilize the compute node, the utilization of a single node is either 0 % or 100 %. The only exception is for coupled CPU tasks (compute and communication), where the network is the bottleneck, resulting in underutilization of CPU resources.
Network activity
Network activity requires active monitoring.
ElastiSim defines network activity as the sum of the maximum bandwidth of all links in the simulated platform. Realistically, the network activity will never reach 100 %, as it is unlikely that all links in the network topology will be fully utilized simultaneously.
| Columns | Value type | Description |
|---|---|---|
| Time | float (seconds) | Time (absolute) |
| Utilization | float (percentage, [0,1]) | Network activity |
Network activity does not consider PFS or loopback links.
PFS utilization
PFS utilization requires active monitoring.
The monitoring module senses the utilization of the PFS links specified in the configuration file. The results include absolute and relative utilization (relative to maximum bandwidth).
| Columns | Value type | Description |
|---|---|---|
| Time | float (seconds) | Time (absolute) |
| Read | float (bytes/s) | PFS read utilization |
| Write | float (bytes/s) | PFS write utilization |
| Read (rel.) | float (percentage, [0,1]) | PFS read utilization |
| Write (rel.) | float (percentage, [0,1]) | PFS write utilization |
GPU utilization
GPU utilization requires active monitoring.
Analogous to CPU utilization, the monitoring module measures GPU utilization per node. The utilization is a relative value and reflects partial usage in the case of multiple GPUs per node.
| Columns | Value type | Description |
|---|---|---|
| Time | float (seconds) | Time (absolute) |
<Node_0> | float (percentage, [0,1]) | GPU utilization |
| … | … | … |
<Node_n> | float (percentage, [0,1]) | GPU utilization |
Task times
Task time logging requires log_task_times to be set to true.
If activated, ElastiSim measures task times per job and node. The duration of a task sequence includes all subtask times.
| Columns | Value type | Description |
|---|---|---|
| Time | float (seconds) | Time (absolute) |
| Job | integer | Job ID |
| Node | string | Node name |
| Task | string | Task name (empty if not set) |
| Duration | float (seconds) | Measured task duration |