time calculation

c++

static int i=0;
static cv::TickMeter tm;
if (i==0) { tm.start(); }

// do what you want to measure here!

i++;
if (i==100) {
    tm.stop();
    std::cout << "Inference time, ms: " << tm.getTimeMilli() << std::endl;
}

iOS

CFTimeInterval startTime = CACurrentMediaTime();

for (int i=0;i<100;i++){

    // do what you want to measure here!

}

CFTimeInterval elapsedTime = CACurrentMediaTime() - startTime;

printf("time consumed:%lf seconds\n", elapsedTime);

XCode, run script

這個script是從stack overflow下載的，並且加以修改，注意在build settings裏面的build active architecture only要設為no：

##########################################

#

# c.f. https://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4

#

# Version 2.82

#

# Latest Change:

# - MORE tweaks to get the iOS 10+ and 9- working

# - Support iOS 10+

# - Corrected typo for iOS 1-10+ (thanks @stuikomma)

#

# Purpose:

#   Automatically create a Universal static library for iPhone + iPad + iPhone Simulator from within XCode

#

# Author: Adam Martin - http://twitter.com/redglassesapps

# Based on: original script from Eonil (main changes: Eonil's script WILL NOT WORK in Xcode GUI - it WILL CRASH YOUR COMPUTER)

# Albus's revision: 1. add project file path

#                   2. cp "${CURRENTCONFIG_SIMULATOR_DIR}/${EXECUTABLE_NAME}" ${WORK_PATH}/prebuild/iOS/lib

set -e

set -o pipefail

#################[ Tests: helps workaround any future bugs in Xcode ]########

#

DEBUG_THIS_SCRIPT="false"

if [ $DEBUG_THIS_SCRIPT = "true" ]

then

echo "########### TESTS #############"

echo "Use the following variables when debugging this script; note that they may change on recursions"

echo "BUILD_DIR = $BUILD_DIR"

echo "BUILD_ROOT = $BUILD_ROOT"

echo "CONFIGURATION_BUILD_DIR = $CONFIGURATION_BUILD_DIR"

echo "BUILT_PRODUCTS_DIR = $BUILT_PRODUCTS_DIR"

echo "CONFIGURATION_TEMP_DIR = $CONFIGURATION_TEMP_DIR"

echo "TARGET_BUILD_DIR = $TARGET_BUILD_DIR"

fi

#####################[ part 1 ]##################

# First, work out the BASESDK version number (NB: Apple ought to report this, but they hide it)

#    (incidental: searching for substrings in sh is a nightmare! Sob)

SDK_VERSION=$(echo ${SDK_NAME} | grep -o '\d\{1,2\}\.\d\{1,2\}$')

# Next, work out if we're in SIM or DEVICE

if [ ${PLATFORM_NAME} = "iphonesimulator" ]

then

OTHER_SDK_TO_BUILD=iphoneos${SDK_VERSION}

else

OTHER_SDK_TO_BUILD=iphonesimulator${SDK_VERSION}

fi

echo "XCode has selected SDK: ${PLATFORM_NAME} with version: ${SDK_VERSION} (although back-targetting: ${IPHONEOS_DEPLOYMENT_TARGET})"

echo "...therefore, OTHER_SDK_TO_BUILD = ${OTHER_SDK_TO_BUILD}"

#

#####################[ end of part 1 ]##################

#####################[ part 2 ]##################

#

# IF this is the original invocation, invoke WHATEVER other builds are required

#

# Xcode is already building ONE target...

#

# ...but this is a LIBRARY, so Apple is wrong to set it to build just one.

# ...we need to build ALL targets

# ...we MUST NOT re-build the target that is ALREADY being built: Xcode WILL CRASH YOUR COMPUTER if you try this (infinite recursion!)

#

#

# So: build ONLY the missing platforms/configurations.

if [ "true" == ${ALREADYINVOKED:-false} ]

then

echo "RECURSION: I am NOT the root invocation, so I'm NOT going to recurse"

else

# CRITICAL:

# Prevent infinite recursion (Xcode sucks)

export ALREADYINVOKED="true"

echo "RECURSION: I am the root ... recursing all missing build targets NOW..."

echo "RECURSION: ...about to invoke: xcodebuild -configuration \"${CONFIGURATION}\" -project \"${PROJECT_NAME}.xcodeproj\" -target \"${TARGET_NAME}\" -sdk \"${OTHER_SDK_TO_BUILD}\" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO" BUILD_DIR=\"${BUILD_DIR}\" BUILD_ROOT=\"${BUILD_ROOT}\" SYMROOT=\"${SYMROOT}\"

xcodebuild -configuration "${CONFIGURATION}" -project "${PROJECT_FILE_PATH}" -target "${TARGET_NAME}" -sdk "${OTHER_SDK_TO_BUILD}" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO BUILD_DIR="${BUILD_DIR}" BUILD_ROOT="${BUILD_ROOT}" SYMROOT="${SYMROOT}"

ACTION="build"

#Merge all platform binaries as a fat binary for each configurations.

# Calculate where the (multiple) built files are coming from:

CURRENTCONFIG_DEVICE_DIR=${SYMROOT}/${CONFIGURATION}-iphoneos

CURRENTCONFIG_SIMULATOR_DIR=${SYMROOT}/${CONFIGURATION}-iphonesimulator

echo "Taking device build from: ${CURRENTCONFIG_DEVICE_DIR}"

echo "Taking simulator build from: ${CURRENTCONFIG_SIMULATOR_DIR}"

CREATING_UNIVERSAL_DIR=${SYMROOT}/${CONFIGURATION}-universal

echo "...I will output a universal build to: ${CREATING_UNIVERSAL_DIR}"

# ... remove the products of previous runs of this script

#      NB: this directory is ONLY created by this script - it should be safe to delete!

set +e

rm "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}"

#mkdir "${CREATING_UNIVERSAL_DIR}"

set -e
# instead of set +e, set -e, you can do as follows to ignore errors :
# rm "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" || true

#

echo "lipo: for current configuration (${CONFIGURATION}) creating output file: ${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}"

xcrun -sdk iphoneos lipo -create -output "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" "${CURRENTCONFIG_DEVICE_DIR}/${EXECUTABLE_NAME}" "${CURRENTCONFIG_SIMULATOR_DIR}/${EXECUTABLE_NAME}"

echo copy "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" to ${WORK_PATH}/prebuild/iOS/lib

cp "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" ${WORK_PATH}/prebuild/iOS/lib

#########

#

# Added: StackOverflow suggestion to also copy "include" files

#    (untested, but should work OK)

#

echo "Fetching headers from ${PUBLIC_HEADERS_FOLDER_PATH}"

echo "  (if you embed your library project in another project, you will need to add"

echo "   a "User Search Headers" build setting of: (NB INCLUDE THE DOUBLE QUOTES BELOW!)"

echo '        "$(TARGET_BUILD_DIR)/usr/local/include/"'

if [ -d "${CURRENTCONFIG_DEVICE_DIR}${PUBLIC_HEADERS_FOLDER_PATH}" ]

then

mkdir -p "${CREATING_UNIVERSAL_DIR}${PUBLIC_HEADERS_FOLDER_PATH}"

# * needs to be outside the double quotes?

cp -r "${CURRENTCONFIG_DEVICE_DIR}${PUBLIC_HEADERS_FOLDER_PATH}"* "${CREATING_UNIVERSAL_DIR}${PUBLIC_HEADERS_FOLDER_PATH}"

fi

fi