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toplev CSV output fields
Andi Kleen edited this page Oct 21, 2020
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| Column | Optional | Description |
|---|---|---|
| Timestamp | (optional) | Time stamp in seconds relative to measurement start (with -Ixxx) |
| CPUs | - CPUs this applies too. This can be a Socket (Sx) or a core (Cx) or a thread Tx, or a combination of those (Sx-Cx-Tx). Not output with --single-thread | |
| Area | toplev node or metric that is being reported | |
| Unit | Unit of the measurement. % means it's a ratio in percent, optionally followed by another unit. Slots is pipeline slots defined by the pipeline width (see the TopDown paper for more details) | |
| Description | (optional) | Description of the node or metric. Usually only printed once. Can be more verbose with --long-desc |
| Sample | (optional) | List of sample events that can be used to sample for the particular bottleneck |
| Stddev | (optional) | Only with -rX for perf rerunning measurements. Report the standard deviation of the results over the reruns. |
| Multiplex | (optional) | Multiplex ratio. When perf has to multiplex the measurements because it needs more performance counters than available this reports the percentage the group(s) measuring the events were active. |
| Bottleneck | (optional) | Contains <== if the node is the critical bottleneck for the given thread and time interval, otherwise empty. |
| Idle | (optional) | Contains Y if the CPU appears to be idle (normally less than 5% of the busiest CPU), so could be ignored. |
Note that for further processing it can be useful to run the data through interval-normalize. This will put each event into its own column. --xnormal supports this automatically in a separate tab of the xlsx sheet.
Lower level output format containing the counter values
| Column | Description |
|---|---|
| Timestamp | Timestamp in seconds relative to measurement start |
| CPU | Linux CPU number |
| Group | Number of measurement group |
| Event | Name of the measurement perfmon event |
| Value | Measured value for interval |
| Perf-event | Event in perf format |
| Index | Index number of measured event |
| STDDEV | Standard deviation of measurement (only with -rX) |
| MULTI | Multiplex ratio (see above) |
| Nodes | Names of all nodes or metrics that use the measured value for their computations |
This is the raw perf stat output. See the man perf-stat manpage for details on the fields.