tar_crew: Get crew worker info.

In targets: Dynamic Function-Oriented 'Make'-Like Declarative Pipelines

Get crew worker info.

Description

For the most recent run of the pipeline with tar_make() where a crew controller was started, get summary-level information of the workers.

Usage

tar_crew(store = targets::tar_config_get("store"))

Arguments

store

Character of length 1, path to the targets data store. Defaults to tar_config_get("store"), which in turn defaults to ⁠_targets/⁠. When you set this argument, the value of tar_config_get("store") is temporarily changed for the current function call. See tar_config_get() and tar_config_set() for details about how to set the data store path persistently for a project.

Value

A data frame one row per crew worker and the following columns:

• controller: name of the crew controller.

• launches: number of times the worker was launched.

• seconds: number of seconds the worker spent running tasks.

• targets: number of targets the worker completed and delivered.

Storage access

Several functions like tar_make(), tar_read(), tar_load(), tar_meta(), and tar_progress() read or modify the local data store of the pipeline. The local data store is in flux while a pipeline is running, and depending on how distributed computing or cloud computing is set up, not all targets can even reach it. So please do not call these functions from inside a target as part of a running pipeline. The only exception is literate programming target factories in the tarchetypes package such as tar_render() and tar_quarto().

See Also

Other data: tar_pid(), tar_process()

Examples

if (identical(Sys.getenv("TAR_EXAMPLES"), "true")) { # for CRAN
tar_dir({ # tar_dir() runs code from a temp dir for CRAN.
if (requireNamespace("crew", quietly = TRUE)) {
tar_script({
  library(targets)
  library(tarchetypes)
  tar_option_set(controller = crew::crew_controller_local())
  list(
    tar_target(x, seq_len(2)),
    tar_target(y, 2 * x, pattern = map(x))
  )
}, ask = FALSE)
tar_make()
tar_process()
tar_process(pid)
}
})
}

targets documentation built on Oct. 3, 2024, 1:11 a.m.