Libmklccgdll New -

Feature Proposal — "libmklccgdll New": Auto-Parallel Solver Tuner

Summary

| Interpretation | Description | |----------------|-------------| | Version update | Refers to MKL 2020+ where DLL naming and layering changed. “New” implies using the latest DLL set (e.g., mkl_rt.dll dynamic dispatch) instead of the legacy monolithic libmklccgdll. | | Runtime linking pattern | Using new in C++ code (e.g., new mkl_compatible_object) alongside MKL memory management — but this is not part of the library name. | | Interface refresh | The “new” interface uses the Intel oneAPI threading layer and clang/ifort compatibility rather than legacy GNU naming. | | Build system flag | In CMake or Makefiles: -DMKL_USE_NEW_DLL=ON or similar to switch from libmklccgdll to mkl_rt.dll. | libmklccgdll new

What is libmklccgdll? A Refresher

Before we explore the "new," we must understand the "old." "Invalid MKL function call" or "Segmentation fault" with

• Preconditioners: none, Jacobi, incomplete Cholesky (ICC/IC0), ILU(k), block-Jacobi, algebraic multigrid (if available).
• Data layouts: CSR, ELLPACK, blocked CSR, hybrid (CSR+ELL).
• Threading strategies: single-threaded, OpenMP with chunking strategies, per-NUMA process placement.
• Precision modes: single, double, mixed-precision (fp32 solves with fp64 correction).
• Tolerance and restart heuristics.

"Invalid MKL function call" or "Segmentation fault" with the new DLL

Solution: Ensure you are using the matching ILP64 vs LP64 interface. The new libmklccgdll defaults to ILP64 (64-bit integers) for larger matrix indexing. Recompile your code with MKL_ILP64 defined. Missing library at runtime (e.g.

Typical issues and fixes

1. Missing library at runtime (e.g., "libmklccgdll_new.so not found" or Windows DLL load failure)

: Supports custom code generation for performance-critical mathematical operations. Environment : Typically found in Windows installations of Intel oneAPI Base Toolkit Intel Parallel Studio XE Dependencies : Often requires companion libraries like libiomp5md.dll (OpenMP) to function correctly. Common Issues and Solutions