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214 lines
8.3 KiB
Markdown
214 lines
8.3 KiB
Markdown
<!--
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Time-stamp: "Last modified 2023-08-02 13:55:11 mluebke"
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-->
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# POET
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[POET](https://doi.org/10.5281/zenodo.4757913) is a coupled reactive transport
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simulator implementing a parallel architecture and a fast, original MPI-based
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Distributed Hash Table.
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## Parsed code documentiation
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A parsed version of POET's documentiation can be found at [Gitlab
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pages](https://naaice.git-pages.gfz-potsdam.de/poet).
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## External Libraries
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The following external header library is shipped with POET:
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- **argh** - https://github.com/adishavit/argh (BSD license)
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- **PhreeqcRM** with patches from GFZ -
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https://www.usgs.gov/software/phreeqc-version-3 -
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https://git.gfz-potsdam.de/mluebke/phreeqcrm-gfz
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- **tug** - https://git.gfz-potsdam.de/sec34/tug
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## Installation
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### Requirements
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To compile POET you need several software to be installed:
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- C/C++ compiler (tested with GCC)
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- MPI-Implementation (tested with OpenMPI and MVAPICH)
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- R language and environment
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- CMake 3.9+
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- *optional*: `doxygen` with `dot` bindings for documentiation
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The following R libraries must then be installed, which will get the
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needed dependencies automatically:
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- [Rcpp](https://cran.r-project.org/web/packages/Rcpp/index.html)
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- [RInside](https://cran.r-project.org/web/packages/RInside/index.html)
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### Compiling source code
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The generation of makefiles is done with CMake. You should be able to generate
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Makefiles by running:
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```sh
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mkdir build && cd build
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cmake ..
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```
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This will create the directory `build` and processes the CMake files
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and generate Makefiles from it. You're now able to run `make` to start
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build process.
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If everything went well you'll find the executable at
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`build/app/poet`, but it is recommended to install the POET project
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structure to a desired `CMAKE_INSTALL_PREFIX` with `make install`.
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During the generation of Makefiles, various options can be specified
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via `cmake -D <option>=<value> [...]`. Currently, there are the
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following available options:
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- **POET_DHT_Debug**=_boolean_ - toggles the output of detailed statistics about
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DHT usage. Defaults to _OFF_.
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- **POET_ENABLE_TESTING**=_boolean_ - enables small set of unit tests (more to
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come). Defaults to _OFF_.
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- **POET_PHT_ADDITIONAL_INFO**=_boolean_ - enabling the count of accesses to one
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PHT bucket. Use with caution, as things will get slowed down significantly.
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Defaults to _OFF_.
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### Example: Build from scratch
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Assuming that only the C/C++ compiler, MPI libraries, R runtime
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environment and CMake have been installed, POET can be installed as
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follows:
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```sh
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# start R environment
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$ R
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# install R dependencies
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> install.packages(c("Rcpp", "RInside"))
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> q(save="no")
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# cd into POET project root
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$ cd <POET_dir>
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# Build process
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$ mkdir build && cd build
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$ cmake -DCMAKE_INSTALL_PREFIX=/home/<user>/poet ..
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$ make -j<max_numprocs>
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$ make install
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```
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This will install a POET project structure into `/home/<user>/poet`
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which is called hereinafter `<POET_INSTALL_DIR>`. With this version of
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POET we **do not recommend** to install to hierarchies like
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`/usr/local/` etc.
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The correspondending directory tree would look like this:
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```sh
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poet
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├── bin
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│ └── poet
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├── R_lib
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│ └── kin_r_library.R
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└── share
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└── poet
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└── bench
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├── barite
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│ ├── barite_interp_eval.R
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│ ├── barite.pqi
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│ ├── barite.R
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│ └── db_barite.dat
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├── dolo
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│ ├── dolo_diffu_inner_large.R
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│ ├── dolo_diffu_inner.R
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│ ├── dolo_inner.pqi
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│ ├── dolo_interp_long.R
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│ └── phreeqc_kin.dat
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└── surfex
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├── ExBase.pqi
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├── ex.R
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├── SMILE_2021_11_01_TH.dat
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├── SurfExBase.pqi
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└── surfex.R
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```
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The R libraries will be loaded at runtime and the paths are hardcoded
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absolute paths inside `poet.cpp`. So, if you consider to move
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`bin/poet` either change paths of the R source files and recompile
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POET or also move `R_lib/*` relative to the binary.
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The benchmarks consist of input scripts, which are provided as .R files.
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Additionally, Phreeqc scripts and their corresponding databases are required,
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stored as .pqi and .dat files, respectively.
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## Running
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Run POET by `mpirun ./poet <OPTIONS> <SIMFILE> <OUTPUT_DIRECTORY>`
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where:
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- **OPTIONS** - runtime parameters (explained below)
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- **SIMFILE** - simulation described as R script (e.g.
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`<POET_INSTALL_DIR>/share/poet/bench/dolo/dolo_interp_long.R`)
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- **OUTPUT_DIRECTORY** - path, where all output of POET should be stored
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### Runtime options
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The following parameters can be set:
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| Option | Value | Description |
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|-----------------------------|--------------|--------------------------------------------------------------------------------------------------------------------------|
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| **--work-package-size=** | _1..n_ | size of work packages (defaults to _5_) |
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| **--ignore-result** | | disables store of simulation resuls |
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| **--dht** | | enabling DHT usage (defaults to _OFF_) |
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| **--dht-strategy=** | _0-1_ | change DHT strategy. **NOT IMPLEMENTED YET** (Defaults to _0_) |
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| **--dht-size=** | _1-n_ | size of DHT per process involved in megabyte (defaults to _1000 MByte_) |
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| **--dht-snaps=** | _0-2_ | disable or enable storage of DHT snapshots |
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| **--dht-file=** | `<SNAPSHOT>` | initializes DHT with the given snapshot file |
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| **--interp-size** | _1-n_ | size of PHT (interpolation) per process in megabyte |
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| **--interp-bucket-entries** | _1-n_ | number of entries to store at maximum in one PHT bucket |
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| **--interp-min** | _1-n_ | number of entries in PHT bucket needed to start interpolation |
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#### Additions to `dht-snaps`
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Following values can be set:
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- _0_ = snapshots are disabled
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- _1_ = only stores snapshot at the end of the simulation with name
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`<OUTPUT_DIRECTORY>.dht`
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- _2_ = stores snapshot at the end and after each iteration iteration
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snapshot files are stored in `<DIRECTORY>/iter<n>.dht`
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### Example: Running from scratch
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We will continue the above example and start a simulation with
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`dolo_diffu_inner.R`. As transport a simple fixed-coefficient diffusion is used.
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It's a 2D, 100x100 grid, simulating 10 time steps. To start the simulation with
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4 processes `cd` into your previously installed POET-dir
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`<POET_INSTALL_DIR>/bin` and run:
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```sh
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mpirun -n 4 ./poet ../share/poet/bench/dolo/dolo_diffu_inner.R/ output
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```
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After a finished simulation all data generated by POET will be found
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in the directory `output`.
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You might want to use the DHT to cache previously simulated data and reuse them
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in further time-steps. Just append `--dht` to the options of POET to activate
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the usage of the DHT. Also, after each iteration a DHT snapshot shall be
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produced. This is done by appending the `--dht-snaps=<value>` option. The
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resulting call would look like this:
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```sh
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mpirun -n 4 ./poet --dht --dht-snaps=2 ../share/poet/bench/dolo/dolo_diffu_inner.R/ output
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```
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## About the usage of MPI_Wtime()
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Implemented time measurement functions uses `MPI_Wtime()`. Some
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important information from the OpenMPI Man Page:
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For example, on platforms that support it, the clock_gettime()
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function will be used to obtain a monotonic clock value with whatever
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precision is supported on that platform (e.g., nanoseconds).
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