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Running OpenDC results in three output files. The first file ([Server](#server)) contains metrics related to the jobs being executed.
The second file ([Host](#host)) contains all metrics related to the hosts on which jobs can be executed. Finally, the third file ([Service](#service))
contains metrics describing the overall performance. An experiment in OpenDC has
### Server
The server output file, contains all metrics of related to the servers run.
| Metric | Datatype | Unit | Summary |
|-----------------|----------|---------------|-------------------------------------------------------------------------------|
| timestamp | int | datetime | Timestamp of the sample |
| server_id | string | | The id of the server determined during runtime |
| server_name | string | | The name of the server provided by the Trace |
| host_id | string | | The id of the host on which the server is hosted or `null` if it has no host. |
| mem_capacity | int | Mb | |
| cpu_count | int | count | |
| cpu_limit | float | MHz | The capacity of the CPUs of Host on which the server is running. |
| cpu_time_active | int | seconds | The duration that a CPU was active in the server. |
| cpu_time_idle | int | seconds | The duration that a CPU was idle in the server. |
| cpu_time_steal | int | seconds | The duration that a vCPU wanted to run, but no capacity was available. |
| cpu_time_lost | int | seconds | The duration of CPU time that was lost due to interference. |
| uptime | int | milli seconds | The uptime of the host since last sample. |
| downtime | int | milli seconds | The downtime of the host since last sample. |
| provision_time | int | datetime | The time at which the server was enqueued for the scheduler. |
| boot_time | int | datetime | The time at which the server booted. |
### Host
The host output file, contains all metrics of related to the host run.
| Metric | DataType | Unit | Summary |
|-------------------|----------|---------------|-------------------------------------------------------------------------------------------------|
| timestamp | int | datetime | Timestamp of the sample |
| host_id | string | | The id of the host given by OpenDC |
| cpu_count | int | count | The number of available cpu cores |
| mem_capacity | int | Mb | The amount of available memory |
| guests_terminated | int | count | The number of guests that are in a terminated state. |
| guests_running | int | count | The number of guests that are in a running state. |
| guests_error | int | count | The number of guests that are in an error state. |
| guests_invalid | int | count | The number of guests that are in an unknown state. |
| cpu_limit | float | MHz | The capacity of the CPUs in the host. |
| cpu_usage | float | MHz | The usage of all CPUs in the host. |
| cpu_demand | float | MHz | The demand of all vCPUs of the guests |
| cpu_utilization | float | ratio | The CPU utilization of the host. This is calculated by dividing the cpu_usage, by the cpu_limit |
| cpu_time_active | int | seconds | The duration that a CPU was active in the host. |
| cpu_time_idle | int | seconds | The duration that a CPU was idle in the host. |
| cpu_time_steal | int | seconds | The duration that a vCPU wanted to run, but no capacity was available. |
| cpu_time_lost | int | seconds | The duration of CPU time that was lost due to interference. |
| power_draw | float | Watt | The current power draw of the host. |
| energy_usage | float | Joule (Ws) | he total energy consumption of the host since last sample. |
| uptime | int | milli seconds | The uptime of the host since last sample. |
| downtime | int | milli seconds | The downtime of the host since last sample. |
| boot_time | int | datetime | The timestamp at which the host booted. |
### Service
The service output file, contains metrics providing an overview of the performance.
| Metric | DataType | Unit | Summary |
|------------------|----------|----------|------------------------------------------------------------------------|
| timestamp | int | datetime | Timestamp of the sample |
| hosts_up | int | count | The number of hosts that are up at this instant. |
| hosts_down | int | count | The number of hosts that are down at this instant. |
| servers_pending | int | count | The number of servers that are pending to be scheduled. |
| servers_active | int | count | The number of servers that are currently active. |
| attempts_success | int | count | The scheduling attempts that were successful. |
| attempts_failure | int | count | The scheduling attempts that were unsuccessful due to client error. |
| attempts_error | int | count | The scheduling attempts that were unsuccessful due to scheduler error. |
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