Added hint for shared jobs.
Showing with 2 additions and 0 deletions
|...||...||@@ -49,6 +49,8 @@ Pika provides the following runtime metrics:|
|Each monitored metric is represented by a timeline, whereby metrics with the same unit and data source are displayed in a common chart, e.g. different Lustre metadata operations.|
|Each metric is measured with a certain granularity concerning the hardware, e.g. per hardware thread, per CPU socket or per node.|
|**Be aware that CPU socket or node metrics can share the resources of other jobs running on the same CPU socket or node. This can result e.g. in cache perturbation and thus a sub-optimal performance. To get valid performance data for those metrics, it is recommended to submit an exclusive job!**|
|**Note:** To reduce the amount of recorded data, Pika summarizes per hardware thread metrics to the corresponding physical core. In terms of simultaneous multithreading (SMT), Pika only provides performance data per physical core.|