From ffb51fe387ac14ed0446d18e46b8634b885c9f1d Mon Sep 17 00:00:00 2001
From: Jan David Mol <mol@astron.nl>
Date: Mon, 19 Aug 2013 17:20:57 +0000
Subject: [PATCH] Task #4716: Cache which rank subbands come from to allow MPI
to optimise for having a known sender for the data
---
RTCP/Cobalt/InputProc/src/Transpose/MapUtil.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/RTCP/Cobalt/InputProc/src/Transpose/MapUtil.h b/RTCP/Cobalt/InputProc/src/Transpose/MapUtil.h
index a4cba51eebc..8c9db6b0b64 100644
--- a/RTCP/Cobalt/InputProc/src/Transpose/MapUtil.h
+++ b/RTCP/Cobalt/InputProc/src/Transpose/MapUtil.h
@@ -24,6 +24,21 @@ namespace LOFAR {
return keys;
}
+ // Returns the keys of an std::map, for non-empty elements
+ template<typename K, typename V>
+ std::vector<K> keys_nonempty( const std::map<K, std::vector<V> > &m )
+ {
+ std::vector<K> keys;
+
+ keys.reserve(m.size());
+ for (typename std::map<K, std::vector<V> >::const_iterator i = m.begin(); i != m.end(); ++i) {
+ if (!i->second.empty())
+ keys.push_back(i->first);
+ }
+
+ return keys;
+ }
+
// Returns the set of unique values of an std::map.
template<typename K, typename V>
--
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