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Add the Timers module to measure real-time and cpu-time
This code is based on the `google/benchmarks` repository. - `realtime` is a monotonic high-resolution clock provided by the kernel. In most cases this is equivalent to `time_ns` in `Base`. - `cputime` is the time that the process was actually running on a processor. This excludes time spend in the kernel and time spend descheduled. The `Timers` module includes a fair-amount of platform specific code so the implementation is split between a generic *unix* implementation based on the high-resoltion clocked provided through `clock_gettime`. On *darwin* prior to 10.12.0 the kernel only provides `CLOCK_MONOTONIC` making it less useful and we have to fallback onto `getRUsage`. We intentional don't do error handling for the timer calls. Which may or may not be a wise choice.
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‎src/BenchmarkTools.jl

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const BENCHMARKTOOLS_VERSION = v"0.2.2"
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##########
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# Timers #
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##########
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include("timers/timers.jl")
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##############
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# Parameters #
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##############
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include("trials.jl")
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export gctime,
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export realtime,
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cputime,
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gctime,
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memory,
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allocs,
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params,

‎src/timers/LICENSE

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‎src/timers/darwin.jl

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##
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# Based upon https://github.com/google/benchmark
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# Translated to Julia by Valentin Churavy
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#
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# Copyright 2015 Google Inc. All rights reserved.
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# Copyright 2017 Valentin Churavy. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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##
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const RUSAGE_SELF = Cint(0)
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const RUSAGE_CHILDREN = Cint(-1)
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struct TimeVal
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tv_sec::Clong
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tv_usec::Clong
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end
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struct RUsage
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ru_utime::TimeVal
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ru_stime::TimeVal
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ru_maxrss::Clong
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ru_ixrss::Clong
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ru_idrss::Clong
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ru_isrss::Clong
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ru_minflt::Clong
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ru_majflt::Clong
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ru_nswap::Clong
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ru_inblock::Clong
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ru_outblock::Clong
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ru_msgsnd::Clong
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ru_msgrcv::Clong
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ru_nsignals::Clong
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ru_nvcsw::Clong
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ru_nivcsw::Clong
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end
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@inline function maketime(ru::RUsage)
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user = ru.ru_utime.tv_sec * 1e9 + ru.ru_utime.tv_usec *1e3
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kernel = ru.ru_stime.tv_sec * 1e9 + ru.ru_stime.tv_usec *1e3
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return user+kernel
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end
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@inline function realtime()
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Float64(Base.time_ns())
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end
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@inline function cputime()
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ru = Ref{RUsage}()
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ccall(:getRUsage, Cint, (Cint, Ref{RUsage}), RUSAGE_SELF, ru)
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return maketime(ru[])
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end

‎src/timers/timers.jl

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##
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# Copyright 2017 Valentin Churavy. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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##
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module Timers
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import Compat
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"""
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realtime()
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Monotonic runtime counter
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Returns time in ns as Float64.
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"""
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function realtime end
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"""
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cputime()
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Process specific CPU time clock.
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Returns time in ns as Float64.
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"""
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function cputime end
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function _applever()
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return VersionNumber(readchomp(`sw_vers -productVersion`))
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end
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if Compat.Sys.isapple() && _applever() < v"10.12.0"
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include("darwin.jl")
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elseif Compat.Sys.isunix()
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include("unix.jl")
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elseif Compat.Sys.iswindows()
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include("windows.jl")
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else
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error("$(Sys.KERNEL) is not supported please file an issue")
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end
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end # module

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