v4.4

Changes

🐛 Bug Fixes

• compiler: Patch TempFunction pickling @FabioLuporini (#1677)
• bench: Patch ASV's generation of new plots @FabioLuporini (#1672)
• gpu: Fix leaks due to excessive fetching/prefetching @FabioLuporini (#1658)
• types: Drop unsafe/unnecessary memoization in the arguments processing engine @FabioLuporini (#1647)
• compiler: Fix processing of grid spacing @FabioLuporini (#1628)
• misc: Avoid crashing on missing _memfree_args @FabioLuporini (#1612)
• compiler: Fix ScheduleTree construction in presence of guards and/or syncs @FabioLuporini (#1611)
• misc: Patch ThreadID pickling @FabioLuporini (#1606)
• compiler: Patch issue #1592 (HaloScheme with time subdimensions) @Leitevmd (#1597)
• dsl: Patch symbolic coefficients with staggered grids @EdCaunt (#1595)
• Fix find_library issue to MacOS Big Sur @speglich (#1584)
• Fix hierarchical blocking + parallelism @FabioLuporini (#1580)
• BoundSymbol constructor to be cached @mloubout (#1576)

Compiler

• compiler: Tweak nested-par candidate condition @georgebisbas (#1669)
• compiler: Singletonize special symbols (e.g. nthreads) @FabioLuporini (#1650)
• misc: Drop unused backend infrastructure @FabioLuporini (#1632)
• compiler: Improve aliases detection, processing, and optimization @FabioLuporini (#1631)
• mpi: Add diag2 mode @FabioLuporini (#1630)
• compiler: Add skewing pass towards Temporal Blocking @georgebisbas (#1620)
• misc: Use pickled soname rather than generating a new one @FabioLuporini (#1605)
• compiler: Add option to use Functions, in place of Arrays, for compiler-generated temporary @FabioLuporini (#1591)
• compiler: Improve the cost model used by CIRE @FabioLuporini (#1585)
• Refactor Array sharing @FabioLuporini (#1583)
• Refactor Operator hierarchy @FabioLuporini (#1573)
• Introduce devito/arch @FabioLuporini (#1563)
• operator: Use FD-Gpts/s instead of Gpts/s @georgebisbas (#1544)

API

• sympy: Support v1.8 @mloubout (#1549)
• compiler: Check consistency between shape and grid for TimeFunction, too @tjb900 (#1667)
• dsl: Add MatrixSparseTimeFunction to support multi-point sources @FabioLuporini (#1603)
• dsl: Enable overriding over SubDimension thickness @FabioLuporini (#1608)
• Shift argument as a tuple @Leitevmd (#1561)
• BoundSymbol constructor to be cached @mloubout (#1576)
• gpu: Add devicerm API for conditional deletions @FabioLuporini (#1571)
• Introduce deviceid API to offload Operators on specific GPUs @FabioLuporini (#1569)

Examples

• advisor: merge roofline and json @georgebisbas (#1649)
• examples: TTI 1st order operators @ofmla (#1602)
• examples: Add viscoacoustic Born operator to 2nd sls equation @nogueirapeterson (#1617)
• examples: Born approximation for TTI media @ofmla (#1555)
• examples: add first order adjoint viscoacoustic equations @nogueirapeterson (#1567)
• Tutorials: add shift parameter to Ren visco-acoustic equation @nogueirapeterson (#1562)

Documentation

• Bump static release number @FabioLuporini (#1564)

MPI

• compiler: Check consistency between shape and grid for TimeFunction, too @tjb900 (#1667)
• mpi: Add diag2 mode @FabioLuporini (#1630)
• mpi: Add ability to specify MPI topology used for grid division @FabioLuporini (#1604)
• mpi: Prevent double finalization with devito used as a lib @FabioLuporini (#1609)
• mpi: Pass MPI_COMM_SELF to Distributor upon unpickling @FabioLuporini (#1607)

GPU

• gpu: Fixup prefetch jitting when using extra symbols @FabioLuporini (#1678)
• gpu: Update Dockerfile.nvidia to HPC SDK 21.3 @kenhester (#1659)
• gpu: Fix leaks due to excessive fetching/prefetching @FabioLuporini (#1658)
• gpu: Add gpu-fit value for all functions (fix #1642) @Leitevmd (#1645)
• compiler: Work around clang[10,11,?] omp-offloading bug @FabioLuporini (#1634)
• arch: Review get_gpu_info @Leitevmd (#1626)
• misc: Updating to NVIDIA HPC SDK 21.2 @kenhester (#1594)
• compiler: Target gpu for PGI openacc @Leitevmd (#1587)
• arch: Add nvidia-smi parser to GPU checking @Leitevmd (#1615)
• gpu: Updated Dockerfile.nvidia to HPC SDK 21.1 @kenhester (#1593)
• gpu: Add devicerm API for conditional deletions @FabioLuporini (#1571)
• Data streaming support with OpenMP offloading @FabioLuporini (#1556)

Testing

• ci: Modify mpi-example workflow and update docker actions @rhodrin (#1664)
• ci: Switch to default gcc(9.3) for conda build @mloubout (#1651)
• ci: Fix conda build @mloubout (#1648)
• ci: Update Ci-gpu for nvidia openmp @Leitevmd (#1635)
• ci: Work around archives missing error on apt install @FabioLuporini (#1623)
• ci: Transfer gpu workflow to self-hosted runners @rhodrin (#1618)
• ci: Separate adjoint based tests @rhodrin (#1572)