Meta files

Each run writes a meta/ folder next to its output files. The meta files map the ids used in the output files to names and fixed properties, and tell which entity is part of which. Join an output file with the meta file of the same name on its id column, for example host.parquet with meta/host.parquet on host_id. Ids are assigned in the order of the topology, and are only meaningful within their own run.

The meta files always have all of their columns. meta/task.parquet is written together with task.parquet, and has one row per task that was submitted.

File	Columns
meta/simulation.parquet	start_time: the time the simulation starts, in milliseconds since the Unix epoch
meta/dataCenter.parquet	data_center_id, data_center_name
meta/cluster.parquet	cluster_id, cluster_name, data_center_id
meta/host.parquet	host_id, host_name, cluster_id, core_count, cpu_capacity (MHz), mem_capacity (MiB), and gpu_capacity_i (MHz) per GPU
meta/powerSource.parquet	power_source_id, power_source_name, data_center_id
meta/battery.parquet	battery_id, battery_name, data_center_id, capacity (J)
meta/task.parquet	task_id, cpu_count, mem_capacity (MiB), gpu_count, submission_time (ms since the start of the simulation)