parallel-NMF. NMF 0.23

Description

Utilities for Parallel Computations

ts_eval generates a thread safe version of eval. It uses boost mutexes provided by the synchronicity package. The generated function has arguments expr and envir, which are passed to eval.

ts_tempfile generates a unique temporary filename that includes the name of the host machine and/or the caller's process id, so that it is thread safe.

hostfile generates a temporary filename composed with the name of the host machine and/or the current process id.

gVariable generates a function that access a global static variable, possibly in shared memory (only for numeric matrix-coercible data in this case). It is used primarily in parallel computations, to preserve data accross computations that are performed by the same process.

Usage

ts_eval(mutex = synchronicity::boost.mutex(), verbose = FALSE)

ts_tempfile(pattern = "file", ..., host = TRUE, pid = TRUE)

hostfile(pattern = "file", tmpdir = tempdir(), fileext = "", host = TRUE, pid = TRUE)

gVariable(init, shared = FALSE)

Arguments

mutex: a mutex or a mutex descriptor. If missing, a new mutex is created via the function boost.mutex.
verbose: a logical that indicates if messages should be printed when locking and unlocking the mutex.
...: extra arguments passed to tempfile.
host: logical that indicates if the host machine name should be appear in the filename.
pid: logical that indicates if the current process id be appear in the filename.
init: initial value
shared: a logical that indicates if the variable should be stored in shared memory or in a local environment.
pattern: a non-empty character vector giving the initial part of the name.
tmpdir: a non-empty character vector giving the directory name
fileext: a non-empty character vector giving the file extension