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% File src/library/base/man/system.time.Rd
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% File src/library/base/man/system.time.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2020 R Core Team
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% Copyright 1995-2020, 2022 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{system.time}
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\name{system.time}
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\title{CPU Time Used}
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\title{CPU Time Used}
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\usage{
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\usage{
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\code{system.time} calls the function \code{\link{proc.time}},
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\code{system.time} calls the function \code{\link{proc.time}},
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evaluates \code{expr}, and then calls \code{proc.time} once more,
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evaluates \code{expr}, and then calls \code{proc.time} once more,
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returning the difference between the two \code{proc.time} calls.
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returning the difference between the two \code{proc.time} calls.
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\code{unix.time} has been an alias of \code{system.time}, for
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\code{unix.time} has been an alias of \code{system.time}, for
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compatibility with S, and has finally been deprecated in 2016.
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compatibility with S, has been deprecated in 2016 and finally became
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defunct in 2022.
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Timings of evaluations of the same expression can vary considerably
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Timings of evaluations of the same expression can vary considerably
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depending on whether the evaluation triggers a garbage collection. When
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depending on whether the evaluation triggers a garbage collection. When
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\code{gcFirst} is \code{TRUE} a garbage collection (\code{\link{gc}})
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\code{gcFirst} is \code{TRUE} a garbage collection (\code{\link{gc}})
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will be performed immediately before the evaluation of \code{expr}.
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will be performed immediately before the evaluation of \code{expr}.
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