From: Martin Kronbichler <martin.kronbichler@uni-a.de>
Date: Mon, 9 May 2022 15:05:21 +0000 (+0200)
Subject: Add changelog
X-Git-Tag: v9.4.0-rc1~232^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6945b0fb9e4e8a97894ff5964f8f582fb805f4b9;p=dealii.git

Add changelog
---

diff --git a/doc/news/changes/minor/20220509Kronbichler b/doc/news/changes/minor/20220509Kronbichler
new file mode 100644
index 0000000000..19c69d5e5e
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+New: The class SolverCG now supports the interleaving of vector operations
+with the matrix-vector product. The prerequisite is an associated `MatrixType`
+class to provide a `vmult` class with two `std::function` objects to specify
+the operation before and after the matrix-vector product, and a
+`PreconditionerType` class that provides a function `apply_to_subrange(const
+unsigned int, const unsigned int) const` that can selectively apply the
+precondition on a part of a vector. For optimal performance, the matrix and
+preconditioner types need to agree on suitable sizes for the sub-ranges.
+<br>
+(Dmytro Sashko, Martin Kronbichler, Peter Munch, 2022/05/09)