update documentation for changes in USER-INTEL support in CMake

cmake/README.md

@@ -155,11 +155,13 @@ make
 
 The CMake build exposes a lot of different options. In the old build system
 some of the package selections were possible by using special make target like
-`make yes-std` or `make no-lib`. Achieving the same result with cmake requires
+`make yes-std` or `make no-lib`. Achieving a similar result with cmake requires
 specifying all options manually. This can quickly become a very long command
 line that is hard to handle.  While these could be stored in a simple script
 file, there is another way of defining "presets" to compile LAMMPS in a certain
-way.
+way. Since the cmake build process - contrary to the conventional build system -
+includes the compilation of the bundled libraries into the standard build process,
+the grouping of those presets is somewhat different.
 
 A preset is a regular CMake script file that can use constructs such as
 variables, lists and for-loops to manipulate configuration options and create
@@ -171,10 +173,10 @@ Such a file can then be passed to cmake via the `-C` flag. Several examples of
 presets can be found in the `cmake/presets` folder.
 
 ```bash
-# build LAMMPS with all "standard" packages which don't use libraries and enable GPU package
+# build LAMMPS with all packages enabled which don't use external libraries and enable GPU package
 mkdir build
 cd build
-cmake -C ../cmake/presets/std_nolib.cmake -D PKG_GPU=on ../cmake
+cmake -C ../cmake/presets/all_on.cmake -C ../cmake/presets/nolib.cmake -D PKG_GPU=on ../cmake
 ```
 
 # Reference
@@ -1429,6 +1431,17 @@ TODO
   </dl>
   </td>
 </tr>
+<tr>
+  <td><code>INTEL_LRT_MODE</code></td>
+  <td>How to support Long-range thread mode in Verlet integration</td>
+  <td>
+  <dl>
+    <dt><code>threads</code> (default, if pthreads available)</dt>
+    <dt><code>none</code> (default, if pthreads not available)</dt>
+    <dt><code>c++11</code></dt>
+  </dl>
+  </td>
+</tr>
 </tbody>
 </table>
 

doc/src/Build_extras.txt

@@ -859,23 +859,34 @@ file.
 USER-INTEL package :h4,link(user-intel)
 
 To build with this package, you must choose which hardware you want to
-build for, either Intel CPUs or Intel KNLs.  You should also typically
-"install the USER-OMP package"_#user-omp, as it can be used in tandem
-with the USER-INTEL package to good effect, as explained on the "Speed
-intel"_Speed_intel.html doc page.
+build for, either x86 CPUs or Intel KNLs in offload mode.  You should
+also typically "install the USER-OMP package"_#user-omp, as it can be
+used in tandem with the USER-INTEL package to good effect, as explained
+on the "Speed intel"_Speed_intel.html doc page.
 
 [CMake build]:
 
 -D INTEL_ARCH=value     # value = cpu (default) or knl
--D BUILD_OMP=yes        # also required to build with the USER-INTEl package :pre
+-D INTEL_LRT_MODE=value # value = threads, none, or c++11 :pre
 
-Requires an Intel compiler as well as the Intel TBB and MKL libraries.
+In Long-range thread mode (LRT) a modified verlet style is used, that
+operates the Kspace calculation in a separate thread concurrently to
+other calculations. This has to be enabled in the "package intel"_package.html
+command at runtime. With the setting "threads" it used the pthreads
+library, while c++11 will use the built-in thread support of C++11
+compilers. The option "none" skips compilation of this feature. The
+default is to use "threads" if pthreads is available and otherwise "none".
+
+Best performance is achieved with Intel hardware, Intel compilers, as well as
+the Intel TBB and MKL libraries. However, the code also compiles, links, and
+runs with other compilers and without TBB and MKL.
 
 [Traditional make]:
 
 Choose which hardware to compile for in Makefile.machine via the
 following settings.  See src/MAKE/OPTIONS/Makefile.intel_cpu* and
-Makefile.knl files for examples.
+Makefile.knl files for examples. and src/USER-INTEL/README for
+additional information.
 
 For CPUs:
 

doc/src/Speed_intel.txt

@@ -24,7 +24,7 @@ LAMMPS to run on the CPU cores and co-processor cores simultaneously.
 
 Angle Styles: charmm, harmonic :ulb,l
 Bond Styles: fene, fourier, harmonic :l
-Dihedral Styles: charmm, harmonic, opls :l
+Dihedral Styles: charmm, fourier, harmonic, opls :l
 Fixes: nve, npt, nvt, nvt/sllod, nve/asphere :l
 Improper Styles: cvff, harmonic :l
 Pair Styles: airebo, airebo/morse, buck/coul/cut, buck/coul/long,