Doc improvements for mac (hw.logicalcpu) (#1415)

doc/installation.md

@@ -103,7 +103,7 @@ We add links to some community-based work based on OpenPose. Note: We do not sup
 The first step is to clone the OpenPose repository.
 
 1. Windows: You might use [GitHub Desktop](https://desktop.github.com/).
-2. Ubuntu:
+2. Ubuntu/Mac:
 ```bash
 git clone https://github.com/CMU-Perceptual-Computing-Lab/openpose
 ```
@@ -180,10 +180,10 @@ make -j`nproc`
 ```
 
 #### Mac
-Build the project by running the following commands.
+Build the project by running the following commands (note that Mac provides both `logicalcpu` and `physicalcpu`, but we want the logical number for maximum speed).
 ```
 cd build/
-make -j`sysctl -n hw.physicalcpu`
+make -j`sysctl -n hw.logicalcpu`
 ```
 
 #### Windows

examples/user_code/README.md

@@ -12,14 +12,20 @@ You can quickly add your custom code into this folder so that quick prototypes c
 1. Install/compile OpenPose as usual.
 2. Add your custom *.cpp / *.hpp files here,. Hint: You might want to start by copying the [OpenPoseDemo](../openpose/openpose.cpp) example or any of the [examples/tutorial_api_cpp/](../tutorial_api_cpp/) examples. Then, you can simply modify their content.
 3. Add the name of your custom *.cpp / *.hpp files at the top of the [examples/user_code/CMakeLists.txt](./CMakeLists.txt) file.
-4. Re-compile OpenPose.
+4. Re-compile OpenPose. Depending on your OS, that means...
+  - Ubuntu:
 ```
-# Ubuntu/Mac
 cd build/
 make -j`nproc`
-# Windows
-# Close Visual Studio, re-run CMake, and re-compile the project in Visual Studio
 ```
+
+  - Mac:
+```
+cd build/
+make -j`sysctl -n hw.logicalcpu`
+```
+
+  - Windows: Close Visual Studio, re-run CMake, and re-compile the project in Visual Studio.
 5. **Run step 4 every time that you make changes into your code**.
 
 

scripts/travis/run_make.sh

@@ -8,8 +8,8 @@ source $BASEDIR/defaults.sh
 if [[ $WITH_CMAKE == true ]] ; then
   cd build
   if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then make -j`nproc` ; fi
-  if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then make -j1 ; fi
+  if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then make -j`sysctl -n hw.logicalcpu` ; fi
 else
   if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then make all -j`nproc` ; fi
-  if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then make all -j1 ; fi
+  if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then make all -j`sysctl -n hw.logicalcpu` ; fi
 fi