commit: 8c606849fd4e35202f211dc20f92cce32e576eb7
Author: Alessandro Barbieri gmail com>
AuthorDate: Wed Jul 28 23:27:11 2021 +
Commit: Alessandro Barbieri gmail com>
CommitDate: Wed Jul 28 23:39:36 2021 +
URL:https://gitweb.gentoo.org/repo/proj/guru.git/commit/?id=8c606849
sys-cluster/lwgrp: initial import
Signed-off-by: Alessandro Barbieri gmail.com>
sys-cluster/lwgrp/Manifest | 1 +
sys-cluster/lwgrp/lwgrp-1.0.3.ebuild | 37 +++
sys-cluster/lwgrp/metadata.xml | 58
3 files changed, 96 insertions(+)
diff --git a/sys-cluster/lwgrp/Manifest b/sys-cluster/lwgrp/Manifest
new file mode 100644
index 0..449722ba3
--- /dev/null
+++ b/sys-cluster/lwgrp/Manifest
@@ -0,0 +1 @@
+DIST lwgrp-1.0.3.tar.gz 39217 BLAKE2B
2e17fce02989832670a7bcd73f80e3aabe185b5d1120777f3d3d2e0bd630e62b6ae64638b724ca3edd9d9c7d7177e505433c16382b5e1fdbc79e8a1b1de1a622
SHA512
b8acdd5fcec8de01f80acfe0f6df33fe3281bd6465a33ad739af06189782f116ac32caacbd458d2e04ba2eaedfbebf67f42cc343f7bee43f8d708e2b8b3c1565
diff --git a/sys-cluster/lwgrp/lwgrp-1.0.3.ebuild
b/sys-cluster/lwgrp/lwgrp-1.0.3.ebuild
new file mode 100644
index 0..d74dc038e
--- /dev/null
+++ b/sys-cluster/lwgrp/lwgrp-1.0.3.ebuild
@@ -0,0 +1,37 @@
+# Copyright 2019-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit autotools
+
+DESCRIPTION="Light-weight Group Library"
+HOMEPAGE="https://github.com/LLNL/lwgrp;
+SRC_URI="https://github.com/LLNL/lwgrp/archive/refs/tags/v${PV}.tar.gz ->
${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="mpianysource"
+
+RDEPEND="virtual/mpi"
+DEPEND="${RDEPEND}"
+
+src_prepare() {
+ default
+ eautoreconf
+}
+
+src_configure() {
+ local myconf=(
+ $(use_enable mpianysource)
+ )
+ econf "${myconf[@]}"
+}
+
+src_install() {
+ default
+ rm -r "${ED}/usr/share/${PN}" || die
+ find "${ED}" -name '*.la' -delete || die
+ find "${ED}" -name '*.a' -delete || die
+}
diff --git a/sys-cluster/lwgrp/metadata.xml b/sys-cluster/lwgrp/metadata.xml
new file mode 100644
index 0..b04f0479f
--- /dev/null
+++ b/sys-cluster/lwgrp/metadata.xml
@@ -0,0 +1,58 @@
+
+http://www.gentoo.org/dtd/metadata.dtd;>
+
+
+ lssndrbarbi...@gmail.com
+ Alessandro Barbieri
+
+
+The light-weight group library defines data structures and collective
+operations to group MPI processes as an ordered set. Such groups are
+useful as substitutes for MPI communicators when the overhead of
+communicator creation is too costly. For example, certain sorting
+algorithms recursively divide processes into subgroups as the sort
+algorithm progresses. These groups may be different with each
+invocation, so that it is inefficient to create and destroy
+communicators during the sort routine.
+
+Data structures:
+chain- each member records addresses of left and right members first and
last rank set boundary to MPI_PROC_NULL
+ring - like the chain, except first and last rank wrap around
+logchain - each member records addresses of each member 2^d hops to left and
right d=0..log(N)-1 (MPI_PROC_NULL at ends)
+logring - each member records addresses of each member 2^d hops to left and
right with wrap at ends
+
+We represent groups of processes using a doubly-linked list called
+a "chain". This is a very simple struct that records the number
+of processes in the group, the rank of the local process within the
+group, the address of the local process, and the addresses of the
+processes having ranks one less (left) and one more (right) than the
+local process. We implement the LWGRP library on top of MPI, so for
+addresses we record a parent communicator and ranks within that
+communicator. To be light-weight, the reference to the communicator
+is a literal copy of the handle value, not a full dup.
+
+Since each member only stores the addresses for a few other group
+members, it is the responsibility of higher level software to exchange
+address information for more general point-to-point communication.
+Additionally, the caller is responsible for choosing tag values as a
+group context.
+
+There is also a "ring", which is like a chain, but it wraps around
+at the ends.
+
+There are two structures, called a logchain and logring, used to cache
+adddresses of more group members. These structures must be used in
+conjunction with either a chain or ring, respectively. They cache
+addresses for processes that are 2^d hops to the left and right sides
+where d ranges from 0 to log(N)-1 inclusive. This pattern enables
+one to construct trees, and so it's useful to cache this information
+for use in collective operations.
+
+
+ Specify whether to use
MPI_ANY_SOURCE
+
+
+ https://github.com/LLNL/lwgrp/issues
+
