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license: apache-2.0 |
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## Content of this dataset |
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This dataset contains runs of experiments to evaluate feasibility of real-time capabilities of Dell R660XS(SN-CB5GXC4) server. |
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There are 3 types of tests: caterpillar, cyclictest, 48-hour benchmark (for detailed explanation see below). |
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It has following tests runs |
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| config | folder | test | description | |
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|----------|----------|-------------|------------------------| |
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| test1 | 05-19-35 | caterpillar | before BIOS correction | |
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| test2 | 06-38-03 | cyclictest | after BIOS correction | |
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| test3 | 15-12-05 | 48-hour | with msr error | |
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| test4 | 10-49-18 | 48-hour | wihout msr error | |
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| test5 | 11-04-24 | 48-hour | using rdtset | |
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For more info about analysis done check out [this](https://github.com/zededa/rt-tools) repo |
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## What Is the Caterpillar Benchmark for RT? |
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The **Caterpillar RT Benchmark** is a diagnostic tool designed to: |
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- Evaluate **real-time responsiveness** of CPU cores under varying system conditions. |
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- Measure **timing jitter** (variations in scheduling and latency). |
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- Identify hardware or kernel-level contributors to timing instability (e.g., IRQs, temperature fluctuations). |
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The benchmark runs multiple real-time workloads while collecting detailed monitoring data from the system. |
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### Input Data Description |
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The benchmark generates several monitoring files in the **output directory**, each containing time-synchronized measurements from different subsystems. |
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| File | Description | |
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|------|--------------| |
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| `output.csv` | Primary timing dataset (sample and session jitter metrics). | |
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| `cpu_monitor.csv` | CPU temperature, frequency, and utilization per core. | |
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| `cpustat_monitor.csv` | Detailed CPU statistics (user/system/idle times, context switches). | |
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| `irq_monitor.csv` | IRQ activity counts per CPU core over time. | |
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| `softirq_monitor.csv` | Kernel-level soft interrupt counts per CPU core. | |
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| `meminfo_monitor.csv` | Memory pressure and allocation statistics. | |
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| `sysinfo.json` | System configuration and metadata (CPU topology, kernel version, etc.). | |
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### Structure of `output.csv` |
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The file `output.csv` contains per-sample jitter measurements recorded during the benchmark. |
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Each row represents a single sampling point with both **sample-level** and **session-level** timing information. |
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| Column | Description | Units | |
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|---------|--------------|-------| |
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| `timestamp` | Timestamp of the measurement | ISO 8601 datetime | |
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| `SampleMin` | Minimum latency within current sampling window | microseconds (µs) | |
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| `SampleMax` | Maximum latency within current sampling window | microseconds (µs) | |
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| `SmplJitter` | Difference between `SampleMax` and `SampleMin` (per-sample jitter) | microseconds (µs) | |
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| `SessionMin` | Minimum latency observed since session start | microseconds (µs) | |
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| `SessionMax` | Maximum latency observed since session start | microseconds (µs) | |
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| `SessionJitter` | `SessionMax - SessionMin`, cumulative jitter for the session | microseconds (µs) | |
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| `Sample` | Sequential sample index | integer | |
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## What Is the cyclictest Benchmark for RT? |
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Cyclictest repeatedly and precisely measures the gap between a thread’s scheduled wake-up time and the moment it actually wakes from clock_nanosleep, providing detailed latency statistics. It identifies real-time latency sources across hardware, firmware, and the operating system. |
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for more details see [here](https://wiki.linuxfoundation.org/realtime/documentation/howto/tools/cyclictest/start) |
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### Input Data Description |
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The benchmark generates several monitoring files in the **output directory**, each containing time-synchronized measurements from different subsystems. |
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| File | Description | |
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|------|--------------| |
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| `output.csv` | csv file containing test results | |
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| `cpu_monitor.csv` | CPU temperature, frequency, and utilization per core. | |
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| `cpustat_monitor.csv` | Detailed CPU statistics (user/system/idle times, context switches). | |
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| `irq_monitor.csv` | IRQ activity counts per CPU core over time. | |
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| `softirq_monitor.csv` | Kernel-level soft interrupt counts per CPU core. | |
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| `meminfo_monitor.csv` | Memory pressure and allocation statistics. | |
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| `sysinfo.json` | System configuration and metadata (CPU topology, kernel version, etc.). | |
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### Structure of `output.csv` |
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| Short | Explanation | |
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|--------|----------------------------------------------------------------------| |
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| `timestamp` | Timestamp of the measurement | |
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| `T` | Thread: Thread index and thread ID | |
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| `P` | Priority: RT thread priority | |
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| `I` | Interval: Intended wake up period for the latency measuring threads | |
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| `C` | Count: Number of times the latency was measured (iteration count) | |
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| `Min` | Minimum: Minimum latency that was measured | |
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| `Act` | Actual: Latency measured during the latest completed iteration | |
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| `Avg` | Average: Average latency that was measured | |
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| `Max` | Maximum: Maximum latency that was measured | |
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