1# Changes/Release Notes 2 3On this page we provide a summary of the main API changes, new features and examples 4for each release of libCEED. 5 6(main)= 7 8## Current `main` branch 9 10### Interface changes 11 12- Update {c:func}`CeedQFunctionGetFields` and {c:func}`CeedOperatorGetFields` to include number of fields. 13- Promote to the public API: QFunction and Operator field objects, `CeedQFunctionField` and `CeedOperatorField`, and associated getters, {c:func}`CeedQFunctionGetFields`; {c:func}`CeedQFunctionFieldGetName`; {c:func}`CeedQFunctionFieldGetSize`; {c:func}`CeedQFunctionFieldGetEvalMode`; {c:func}`CeedOperatorGetFields`; {c:func}`CeedOperatorFieldGetElemRestriction`; {c:func}`CeedOperatorFieldGetBasis`; and {c:func}`CeedOperatorFieldGetVector`. 14- Clarify and document conditions where `CeedQFunction` and `CeedOperator` become immutable and no further fields or suboperators can be added. 15- Add {c:func}`CeedOperatorLinearAssembleQFunctionBuildOrUpdate` to reduce object creation overhead in assembly of CeedOperator preconditioning ingredients. 16- Promote {c:func}`CeedOperatorCheckReady`to the public API to facilitate interactive interfaces. 17- Warning added when compiling OCCA backend to alert users that this backend is experimental. 18- `ceed-backend.h`, `ceed-hash.h`, and `ceed-khash.h` removed. Users should use `ceed/backend.h`, `ceed/hash.h`, and `ceed/khash.h`. 19- Added {c:func}`CeedQFunctionGetKernelName`; refactored {c:func}`CeedQFunctionGetSourcePath` to exclude function kernel name. 20 21### New features 22 23- `CeedScalar` can now be set as `float` or `double` at compile time. 24- Added JiT utilities in `ceed/jit-tools.h` to reduce duplicated code in GPU backends. 25- Added support for JiT of QFunctions with `#include "relative/path/local-file.h"` statements for additional local files. Note that files included with `""` are searched relative to the current file first, then by compiler paths (as with `<>` includes). To use this feature, one should adhere to relative paths only, not compiler flags like `-I`, which the JiT will not be aware of. 26- Remove need to guard library headers in QFunction source for code generation backends. 27- `CeedDebugEnv()` macro created to provide debugging outputs when Ceed context is not present. 28 29### Maintainability 30 31- Refactored preconditioner support internally to facilitate future development and improve GPU completeness/test coverage. 32- `Include-what-you-use` makefile target added as `make iwyu`. 33 34(v0-9)= 35 36## v0.9 (Jul 6, 2021) 37 38### Interface changes 39 40- Minor modification in error handling macro to silence pedantic warnings when compiling with Clang, but no functional impact. 41 42### New features 43 44- Add {c:func}`CeedVectorAXPY` and {c:func}`CeedVectorPointwiseMult` as a convenience for stand-alone testing and internal use. 45- Add `CEED_QFUNCTION_HELPER` macro to properly annotate QFunction helper functions for code generation backends. 46- Add `CeedPragmaOptimizeOff` macro for code that is sensitive to floating point errors from fast math optimizations. 47- Rust support: split `libceed-sys` crate out of `libceed` and [publish both on crates.io](https://crates.io/crates/libceed). 48 49### Performance improvements 50 51### Examples 52 53- Solid mechanics mini-app updated to explore the performance impacts of various formulations in the initial and current configurations. 54- Fluid mechanics example adds GPU support and improves modularity. 55 56### Deprecated backends 57 58- The `/cpu/self/tmpl` and `/cpu/self/tmpl/sub` backends have been removed. These backends were intially added to test the backend inheritance mechanism, but this mechanism is now widely used and tested in multiple backends. 59 60(v0-8)= 61 62## v0.8 (Mar 31, 2021) 63 64### Interface changes 65 66- Error handling improved to include enumerated error codes for C interface return values. 67- Installed headers that will follow semantic versioning were moved to {code}`include/ceed` directory. These headers have been renamed from {code}`ceed-*.h` to {code}`ceed/*.h`. Placeholder headers with the old naming schema are currently provided, but these headers will be removed in the libCEED v0.9 release. 68 69### New features 70 71- Julia and Rust interfaces added, providing a nearly 1-1 correspondence with the C interface, plus some convenience features. 72- Static libraries can be built with `make STATIC=1` and the pkg-config file is installed accordingly. 73- Add {c:func}`CeedOperatorLinearAssembleSymbolic` and {c:func}`CeedOperatorLinearAssemble` to support full assembly of libCEED operators. 74 75### Performance improvements 76 77- New HIP MAGMA backends for hipMAGMA library users: `/gpu/hip/magma` and `/gpu/hip/magma/det`. 78- New HIP backends for improved tensor basis performance: `/gpu/hip/shared` and `/gpu/hip/gen`. 79 80### Examples 81 82- {ref}`example-petsc-elasticity` example updated with traction boundary conditions and improved Dirichlet boundary conditions. 83- {ref}`example-petsc-elasticity` example updated with Neo-Hookean hyperelasticity in current configuration as well as improved Neo-Hookean hyperelasticity exploring storage vs computation tradeoffs. 84- {ref}`example-petsc-navier-stokes` example updated with isentropic traveling vortex test case, an analytical solution to the Euler equations that is useful for testing boundary conditions, discretization stability, and order of accuracy. 85- {ref}`example-petsc-navier-stokes` example updated with support for performing convergence study and plotting order of convergence by polynomial degree. 86 87(v0-7)= 88 89## v0.7 (Sep 29, 2020) 90 91### Interface changes 92 93- Replace limited {code}`CeedInterlaceMode` with more flexible component stride {code}`compstride` in {code}`CeedElemRestriction` constructors. 94 As a result, the {code}`indices` parameter has been replaced with {code}`offsets` and the {code}`nnodes` parameter has been replaced with {code}`lsize`. 95 These changes improve support for mixed finite element methods. 96- Replace various uses of {code}`Ceed*Get*Status` with {code}`Ceed*Is*` in the backend API to match common nomenclature. 97- Replace {code}`CeedOperatorAssembleLinearDiagonal` with {c:func}`CeedOperatorLinearAssembleDiagonal` for clarity. 98- Linear Operators can be assembled as point-block diagonal matrices with {c:func}`CeedOperatorLinearAssemblePointBlockDiagonal`, provided in row-major form in a {code}`ncomp` by {code}`ncomp` block per node. 99- Diagonal assemble interface changed to accept a {ref}`CeedVector` instead of a pointer to a {ref}`CeedVector` to reduce memory movement when interfacing with calling code. 100- Added {c:func}`CeedOperatorLinearAssembleAddDiagonal` and {c:func}`CeedOperatorLinearAssembleAddPointBlockDiagonal` for improved future integration with codes such as MFEM that compose the action of {ref}`CeedOperator`s external to libCEED. 101- Added {c:func}`CeedVectorTakeAray` to sync and remove libCEED read/write access to an allocated array and pass ownership of the array to the caller. 102 This function is recommended over {c:func}`CeedVectorSyncArray` when the {code}`CeedVector` has an array owned by the caller that was set by {c:func}`CeedVectorSetArray`. 103- Added {code}`CeedQFunctionContext` object to manage user QFunction context data and reduce copies between device and host memory. 104- Added {c:func}`CeedOperatorMultigridLevelCreate`, {c:func}`CeedOperatorMultigridLevelCreateTensorH1`, and {c:func}`CeedOperatorMultigridLevelCreateH1` to facilitate creation of multigrid prolongation, restriction, and coarse grid operators using a common quadrature space. 105 106### New features 107 108- New HIP backend: `/gpu/hip/ref`. 109- CeedQFunction support for user `CUfunction`s in some backends 110 111### Performance improvements 112 113- OCCA backend rebuilt to facilitate future performance enhancements. 114- Petsc BPs suite improved to reduce noise due to multiple calls to {code}`mpiexec`. 115 116### Examples 117 118- {ref}`example-petsc-elasticity` example updated with strain energy computation and more flexible boundary conditions. 119 120### Deprecated backends 121 122- The `/gpu/cuda/reg` backend has been removed, with its core features moved into `/gpu/cuda/ref` and `/gpu/cuda/shared`. 123 124(v0-6)= 125 126## v0.6 (Mar 29, 2020) 127 128libCEED v0.6 contains numerous new features and examples, as well as expanded 129documentation in [this new website](https://libceed.readthedocs.io). 130 131### New features 132 133- New Python interface using [CFFI](https://cffi.readthedocs.io/) provides a nearly 134 1-1 correspondence with the C interface, plus some convenience features. For instance, 135 data stored in the {cpp:type}`CeedVector` structure are available without copy as 136 {py:class}`numpy.ndarray`. Short tutorials are provided in 137 [Binder](https://mybinder.org/v2/gh/CEED/libCEED/main?urlpath=lab/tree/examples/tutorials/). 138- Linear QFunctions can be assembled as block-diagonal matrices (per quadrature point, 139 {c:func}`CeedOperatorAssembleLinearQFunction`) or to evaluate the diagonal 140 ({c:func}`CeedOperatorAssembleLinearDiagonal`). These operations are useful for 141 preconditioning ingredients and are used in the libCEED's multigrid examples. 142- The inverse of separable operators can be obtained using 143 {c:func}`CeedOperatorCreateFDMElementInverse` and applied with 144 {c:func}`CeedOperatorApply`. This is a useful preconditioning ingredient, 145 especially for Laplacians and related operators. 146- New functions: {c:func}`CeedVectorNorm`, {c:func}`CeedOperatorApplyAdd`, 147 {c:func}`CeedQFunctionView`, {c:func}`CeedOperatorView`. 148- Make public accessors for various attributes to facilitate writing composable code. 149- New backend: `/cpu/self/memcheck/serial`. 150- QFunctions using variable-length array (VLA) pointer constructs can be used with CUDA 151 backends. (Single source is coming soon for OCCA backends.) 152- Fix some missing edge cases in CUDA backend. 153 154### Performance Improvements 155 156- MAGMA backend performance optimization and non-tensor bases. 157- No-copy optimization in {c:func}`CeedOperatorApply`. 158 159### Interface changes 160 161- Replace {code}`CeedElemRestrictionCreateIdentity` and 162 {code}`CeedElemRestrictionCreateBlocked` with more flexible 163 {c:func}`CeedElemRestrictionCreateStrided` and 164 {c:func}`CeedElemRestrictionCreateBlockedStrided`. 165- Add arguments to {c:func}`CeedQFunctionCreateIdentity`. 166- Replace ambiguous uses of {cpp:enum}`CeedTransposeMode` for L-vector identification 167 with {cpp:enum}`CeedInterlaceMode`. This is now an attribute of the 168 {cpp:type}`CeedElemRestriction` (see {c:func}`CeedElemRestrictionCreate`) and no 169 longer passed as `lmode` arguments to {c:func}`CeedOperatorSetField` and 170 {c:func}`CeedElemRestrictionApply`. 171 172### Examples 173 174libCEED-0.6 contains greatly expanded examples with {ref}`new documentation <Examples>`. 175Notable additions include: 176 177- Standalone {ref}`ex2-surface` ({file}`examples/ceed/ex2-surface`): compute the area of 178 a domain in 1, 2, and 3 dimensions by applying a Laplacian. 179 180- PETSc {ref}`example-petsc-area` ({file}`examples/petsc/area.c`): computes surface area 181 of domains (like the cube and sphere) by direct integration on a surface mesh; 182 demonstrates geometric dimension different from topological dimension. 183 184- PETSc {ref}`example-petsc-bps`: 185 186 - {file}`examples/petsc/bpsraw.c` (formerly `bps.c`): transparent CUDA support. 187 - {file}`examples/petsc/bps.c` (formerly `bpsdmplex.c`): performance improvements 188 and transparent CUDA support. 189 - {ref}`example-petsc-bps-sphere` ({file}`examples/petsc/bpssphere.c`): 190 generalizations of all CEED BPs to the surface of the sphere; demonstrates geometric 191 dimension different from topological dimension. 192 193- {ref}`example-petsc-multigrid` ({file}`examples/petsc/multigrid.c`): new p-multigrid 194 solver with algebraic multigrid coarse solve. 195 196- {ref}`example-petsc-navier-stokes` ({file}`examples/fluids/navierstokes.c`; formerly 197 `examples/navier-stokes`): unstructured grid support (using PETSc's `DMPlex`), 198 implicit time integration, SU/SUPG stabilization, free-slip boundary conditions, and 199 quasi-2D computational domain support. 200 201- {ref}`example-petsc-elasticity` ({file}`examples/solids/elasticity.c`): new solver for 202 linear elasticity, small-strain hyperelasticity, and globalized finite-strain 203 hyperelasticity using p-multigrid with algebraic multigrid coarse solve. 204 205(v0-5)= 206 207## v0.5 (Sep 18, 2019) 208 209For this release, several improvements were made. Two new CUDA backends were added to 210the family of backends, of which, the new `cuda-gen` backend achieves state-of-the-art 211performance using single-source {ref}`CeedQFunction`. From this release, users 212can define Q-Functions in a single source code independently of the targeted backend 213with the aid of a new macro `CEED QFUNCTION` to support JIT (Just-In-Time) and CPU 214compilation of the user provided {ref}`CeedQFunction` code. To allow a unified 215declaration, the {ref}`CeedQFunction` API has undergone a slight change: 216the `QFunctionField` parameter `ncomp` has been changed to `size`. This change 217requires setting the previous value of `ncomp` to `ncomp*dim` when adding a 218`QFunctionField` with eval mode `CEED EVAL GRAD`. 219 220Additionally, new CPU backends 221were included in this release, such as the `/cpu/self/opt/*` backends (which are 222written in pure C and use partial **E-vectors** to improve performance) and the 223`/cpu/self/ref/memcheck` backend (which relies upon the 224[Valgrind](http://valgrind.org/) Memcheck tool to help verify that user 225{ref}`CeedQFunction` have no undefined values). 226This release also included various performance improvements, bug fixes, new examples, 227and improved tests. Among these improvements, vectorized instructions for 228{ref}`CeedQFunction` code compiled for CPU were enhanced by using `CeedPragmaSIMD` 229instead of `CeedPragmaOMP`, implementation of a {ref}`CeedQFunction` gallery and 230identity Q-Functions were introduced, and the PETSc benchmark problems were expanded 231to include unstructured meshes handling were. For this expansion, the prior version of 232the PETSc BPs, which only included data associated with structured geometries, were 233renamed `bpsraw`, and the new version of the BPs, which can handle data associated 234with any unstructured geometry, were called `bps`. Additionally, other benchmark 235problems, namely BP2 and BP4 (the vector-valued versions of BP1 and BP3, respectively), 236and BP5 and BP6 (the collocated versions---for which the quadrature points are the same 237as the Gauss Lobatto nodes---of BP3 and BP4 respectively) were added to the PETSc 238examples. Furthermoew, another standalone libCEED example, called `ex2`, which 239computes the surface area of a given mesh was added to this release. 240 241Backends available in this release: 242 243| CEED resource (`-ceed`) | Backend | 244|--------------------------|-----------------------------------------------------| 245| `/cpu/self/ref/serial` | Serial reference implementation | 246| `/cpu/self/ref/blocked` | Blocked reference implementation | 247| `/cpu/self/ref/memcheck` | Memcheck backend, undefined value checks | 248| `/cpu/self/opt/serial` | Serial optimized C implementation | 249| `/cpu/self/opt/blocked` | Blocked optimized C implementation | 250| `/cpu/self/avx/serial` | Serial AVX implementation | 251| `/cpu/self/avx/blocked` | Blocked AVX implementation | 252| `/cpu/self/xsmm/serial` | Serial LIBXSMM implementation | 253| `/cpu/self/xsmm/blocked` | Blocked LIBXSMM implementation | 254| `/cpu/occa` | Serial OCCA kernels | 255| `/gpu/occa` | CUDA OCCA kernels | 256| `/omp/occa` | OpenMP OCCA kernels | 257| `/ocl/occa` | OpenCL OCCA kernels | 258| `/gpu/cuda/ref` | Reference pure CUDA kernels | 259| `/gpu/cuda/reg` | Pure CUDA kernels using one thread per element | 260| `/gpu/cuda/shared` | Optimized pure CUDA kernels using shared memory | 261| `/gpu/cuda/gen` | Optimized pure CUDA kernels using code generation | 262| `/gpu/magma` | CUDA MAGMA kernels | 263 264Examples available in this release: 265 266:::{list-table} 267:header-rows: 1 268:widths: auto 269* - User code 270 - Example 271* - `ceed` 272 - * ex1 (volume) 273 * ex2 (surface) 274* - `mfem` 275 - * BP1 (scalar mass operator) 276 * BP3 (scalar Laplace operator) 277* - `petsc` 278 - * BP1 (scalar mass operator) 279 * BP2 (vector mass operator) 280 * BP3 (scalar Laplace operator) 281 * BP4 (vector Laplace operator) 282 * BP5 (collocated scalar Laplace operator) 283 * BP6 (collocated vector Laplace operator) 284 * Navier-Stokes 285* - `nek5000` 286 - * BP1 (scalar mass operator) 287 * BP3 (scalar Laplace operator) 288::: 289 290(v0-4)= 291 292## v0.4 (Apr 1, 2019) 293 294libCEED v0.4 was made again publicly available in the second full CEED software 295distribution, release CEED 2.0. This release contained notable features, such as 296four new CPU backends, two new GPU backends, CPU backend optimizations, initial 297support for operator composition, performance benchmarking, and a Navier-Stokes demo. 298The new CPU backends in this release came in two families. The `/cpu/self/*/serial` 299backends process one element at a time and are intended for meshes with a smaller number 300of high order elements. The `/cpu/self/*/blocked` backends process blocked batches of 301eight interlaced elements and are intended for meshes with higher numbers of elements. 302The `/cpu/self/avx/*` backends rely upon AVX instructions to provide vectorized CPU 303performance. The `/cpu/self/xsmm/*` backends rely upon the 304[LIBXSMM](http://github.com/hfp/libxsmm) package to provide vectorized CPU 305performance. The `/gpu/cuda/*` backends provide GPU performance strictly using CUDA. 306The `/gpu/cuda/ref` backend is a reference CUDA backend, providing reasonable 307performance for most problem configurations. The `/gpu/cuda/reg` backend uses a simple 308parallelization approach, where each thread treats a finite element. Using just in time 309compilation, provided by nvrtc (NVidia Runtime Compiler), and runtime parameters, this 310backend unroll loops and map memory address to registers. The `/gpu/cuda/reg` backend 311achieve good peak performance for 1D, 2D, and low order 3D problems, but performance 312deteriorates very quickly when threads run out of registers. 313 314A new explicit time-stepping Navier-Stokes solver was added to the family of libCEED 315examples in the `examples/petsc` directory (see {ref}`example-petsc-navier-stokes`). 316This example solves the time-dependent Navier-Stokes equations of compressible gas 317dynamics in a static Eulerian three-dimensional frame, using structured high-order 318finite/spectral element spatial discretizations and explicit high-order time-stepping 319(available in PETSc). Moreover, the Navier-Stokes example was developed using PETSc, 320so that the pointwise physics (defined at quadrature points) is separated from the 321parallelization and meshing concerns. 322 323Backends available in this release: 324 325| CEED resource (`-ceed`) | Backend | 326|--------------------------|-----------------------------------------------------| 327| `/cpu/self/ref/serial` | Serial reference implementation | 328| `/cpu/self/ref/blocked` | Blocked reference implementation | 329| `/cpu/self/tmpl` | Backend template, defaults to `/cpu/self/blocked` | 330| `/cpu/self/avx/serial` | Serial AVX implementation | 331| `/cpu/self/avx/blocked` | Blocked AVX implementation | 332| `/cpu/self/xsmm/serial` | Serial LIBXSMM implementation | 333| `/cpu/self/xsmm/blocked` | Blocked LIBXSMM implementation | 334| `/cpu/occa` | Serial OCCA kernels | 335| `/gpu/occa` | CUDA OCCA kernels | 336| `/omp/occa` | OpenMP OCCA kernels | 337| `/ocl/occa` | OpenCL OCCA kernels | 338| `/gpu/cuda/ref` | Reference pure CUDA kernels | 339| `/gpu/cuda/reg` | Pure CUDA kernels using one thread per element | 340| `/gpu/magma` | CUDA MAGMA kernels | 341 342Examples available in this release: 343 344:::{list-table} 345:header-rows: 1 346:widths: auto 347* - User code 348 - Example 349* - `ceed` 350 - * ex1 (volume) 351* - `mfem` 352 - * BP1 (scalar mass operator) 353 * BP3 (scalar Laplace operator) 354* - `petsc` 355 - * BP1 (scalar mass operator) 356 * BP3 (scalar Laplace operator) 357 * Navier-Stokes 358* - `nek5000` 359 - * BP1 (scalar mass operator) 360 * BP3 (scalar Laplace operator) 361::: 362 363(v0-3)= 364 365## v0.3 (Sep 30, 2018) 366 367Notable features in this release include active/passive field interface, support for 368non-tensor bases, backend optimization, and improved Fortran interface. This release 369also focused on providing improved continuous integration, and many new tests with code 370coverage reports of about 90%. This release also provided a significant change to the 371public interface: a {ref}`CeedQFunction` can take any number of named input and output 372arguments while {ref}`CeedOperator` connects them to the actual data, which may be 373supplied explicitly to `CeedOperatorApply()` (active) or separately via 374`CeedOperatorSetField()` (passive). This interface change enables reusable libraries 375of CeedQFunctions and composition of block solvers constructed using 376{ref}`CeedOperator`. A concept of blocked restriction was added to this release and 377used in an optimized CPU backend. Although this is typically not visible to the user, 378it enables effective use of arbitrary-length SIMD while maintaining cache locality. 379This CPU backend also implements an algebraic factorization of tensor product gradients 380to perform fewer operations than standard application of interpolation and 381differentiation from nodes to quadrature points. This algebraic formulation 382automatically supports non-polynomial and non-interpolatory bases, thus is more general 383than the more common derivation in terms of Lagrange polynomials on the quadrature points. 384 385Backends available in this release: 386 387| CEED resource (`-ceed`) | Backend | 388|-------------------------|-----------------------------------------------------| 389| `/cpu/self/blocked` | Blocked reference implementation | 390| `/cpu/self/ref` | Serial reference implementation | 391| `/cpu/self/tmpl` | Backend template, defaults to `/cpu/self/blocked` | 392| `/cpu/occa` | Serial OCCA kernels | 393| `/gpu/occa` | CUDA OCCA kernels | 394| `/omp/occa` | OpenMP OCCA kernels | 395| `/ocl/occa` | OpenCL OCCA kernels | 396| `/gpu/magma` | CUDA MAGMA kernels | 397 398Examples available in this release: 399 400:::{list-table} 401:header-rows: 1 402:widths: auto 403* - User code 404 - Example 405* - `ceed` 406 - * ex1 (volume) 407* - `mfem` 408 - * BP1 (scalar mass operator) 409 * BP3 (scalar Laplace operator) 410* - `petsc` 411 - * BP1 (scalar mass operator) 412 * BP3 (scalar Laplace operator) 413* - `nek5000` 414 - * BP1 (scalar mass operator) 415 * BP3 (scalar Laplace operator) 416::: 417 418(v0-21)= 419 420## v0.21 (Sep 30, 2018) 421 422A MAGMA backend (which relies upon the 423[MAGMA](https://bitbucket.org/icl/magma) package) was integrated in libCEED for this 424release. This initial integration set up the framework of using MAGMA and provided the 425libCEED functionality through MAGMA kernels as one of libCEED’s computational backends. 426As any other backend, the MAGMA backend provides extended basic data structures for 427{ref}`CeedVector`, {ref}`CeedElemRestriction`, and {ref}`CeedOperator`, and implements 428the fundamental CEED building blocks to work with the new data structures. 429In general, the MAGMA-specific data structures keep the libCEED pointers to CPU data 430but also add corresponding device (e.g., GPU) pointers to the data. Coherency is handled 431internally, and thus seamlessly to the user, through the functions/methods that are 432provided to support them. 433 434Backends available in this release: 435 436| CEED resource (`-ceed`) | Backend | 437|-------------------------|---------------------------------| 438| `/cpu/self` | Serial reference implementation | 439| `/cpu/occa` | Serial OCCA kernels | 440| `/gpu/occa` | CUDA OCCA kernels | 441| `/omp/occa` | OpenMP OCCA kernels | 442| `/ocl/occa` | OpenCL OCCA kernels | 443| `/gpu/magma` | CUDA MAGMA kernels | 444 445Examples available in this release: 446 447:::{list-table} 448:header-rows: 1 449:widths: auto 450* - User code 451 - Example 452* - `ceed` 453 - * ex1 (volume) 454* - `mfem` 455 - * BP1 (scalar mass operator) 456 * BP3 (scalar Laplace operator) 457* - `petsc` 458 - * BP1 (scalar mass operator) 459* - `nek5000` 460 - * BP1 (scalar mass operator) 461::: 462 463(v0-2)= 464 465## v0.2 (Mar 30, 2018) 466 467libCEED was made publicly available the first full CEED software distribution, release 468CEED 1.0. The distribution was made available using the Spack package manager to provide 469a common, easy-to-use build environment, where the user can build the CEED distribution 470with all dependencies. This release included a new Fortran interface for the library. 471This release also contained major improvements in the OCCA backend (including a new 472`/ocl/occa` backend) and new examples. The standalone libCEED example was modified to 473compute the volume volume of a given mesh (in 1D, 2D, or 3D) and placed in an 474`examples/ceed` subfolder. A new `mfem` example to perform BP3 (with the application 475of the Laplace operator) was also added to this release. 476 477Backends available in this release: 478 479| CEED resource (`-ceed`) | Backend | 480|-------------------------|---------------------------------| 481| `/cpu/self` | Serial reference implementation | 482| `/cpu/occa` | Serial OCCA kernels | 483| `/gpu/occa` | CUDA OCCA kernels | 484| `/omp/occa` | OpenMP OCCA kernels | 485| `/ocl/occa` | OpenCL OCCA kernels | 486 487Examples available in this release: 488 489:::{list-table} 490:header-rows: 1 491:widths: auto 492* - User code 493 - Example 494* - `ceed` 495 - * ex1 (volume) 496* - `mfem` 497 - * BP1 (scalar mass operator) 498 * BP3 (scalar Laplace operator) 499* - `petsc` 500 - * BP1 (scalar mass operator) 501* - `nek5000` 502 - * BP1 (scalar mass operator) 503::: 504 505(v0-1)= 506 507## v0.1 (Jan 3, 2018) 508 509Initial low-level API of the CEED project. The low-level API provides a set of Finite 510Elements kernels and components for writing new low-level kernels. Examples include: 511vector and sparse linear algebra, element matrix assembly over a batch of elements, 512partial assembly and action for efficient high-order operators like mass, diffusion, 513advection, etc. The main goal of the low-level API is to establish the basis for the 514high-level API. Also, identifying such low-level kernels and providing a reference 515implementation for them serves as the basis for specialized backend implementations. 516This release contained several backends: `/cpu/self`, and backends which rely upon the 517[OCCA](http://github.com/libocca/occa) package, such as `/cpu/occa`, 518`/gpu/occa`, and `/omp/occa`. 519It also included several examples, in the `examples` folder: 520A standalone code that shows the usage of libCEED (with no external 521dependencies) to apply the Laplace operator, `ex1`; an `mfem` example to perform BP1 522(with the application of the mass operator); and a `petsc` example to perform BP1 523(with the application of the mass operator). 524 525Backends available in this release: 526 527| CEED resource (`-ceed`) | Backend | 528|-------------------------|---------------------------------| 529| `/cpu/self` | Serial reference implementation | 530| `/cpu/occa` | Serial OCCA kernels | 531| `/gpu/occa` | CUDA OCCA kernels | 532| `/omp/occa` | OpenMP OCCA kernels | 533 534Examples available in this release: 535 536| User code | Example | 537|-----------------------|-----------------------------------| 538| `ceed` | ex1 (scalar Laplace operator) | 539| `mfem` | BP1 (scalar mass operator) | 540| `petsc` | BP1 (scalar mass operator) | 541``` 542