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Some performance optimizations (#5424)

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* Some performance optimizations

This is globally removing some memory useless copy

* use a const ref return on std::string Settings::get to prevent data copy on getters which doesn't need to copy it
 * pass some stack created strings to static const as they are not modified anywhere
 * Camera: return nametags per const ref instead of a list pointer, we only need to read it
 * INodeDefManager: getAll should be a result ref writer instead of a return copy
 * INodeDefManager: getAlias should return a const std::string ref
 * Minimap: unroll a Scolor creation in blitMinimapPixersToImageRadar to prvent many variable construct/destruct which are unneeded (we rewrite the content in the loop)
 * CNodeDefManager::updateAliases: prevent a idef getall copy
 * Profiler: constness
 * rollback_interface: create real_name later, and use const ref
 * MapBlockMesh updateFastFaceRow: unroll TileSpec next_tile, which has a cost of 1.8% CPU due to variable allocation/destruction,
 * MapBlockMesh updateFastFaceRow: copy next_tile to tile only if it's a different tilespec
 * MapBlockMesh updateFastFaceRow: use memcpy to copy next_lights to lights to do it in a single cpu operation
This commit is contained in:
Loïc Blot 2017-03-22 21:41:02 +01:00 • committed by GitHub
parent 9efc5da0fb
commit 072bbba69a
16 changed files with 79 additions and 134 deletions
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33
src/profiler.h
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@ -119,39 +119,34 @@ public:
u32 minindex, maxindex;
paging(m_data.size(), page, pagecount, minindex, maxindex);
for(std::map<std::string, float>::iterator
i = m_data.begin();
i != m_data.end(); ++i)
{
if(maxindex == 0)
for (std::map<std::string, float>::const_iterator i = m_data.begin();
i != m_data.end(); ++i) {
if (maxindex == 0)
break;
maxindex--;
if(minindex != 0)
{
if (minindex != 0) {
minindex--;
continue;
}
std::string name = i->first;
int avgcount = 1;
std::map<std::string, int>::iterator n = m_avgcounts.find(name);
if(n != m_avgcounts.end()){
std::map<std::string, int>::const_iterator n = m_avgcounts.find(i->first);
if (n != m_avgcounts.end()) {
if(n->second >= 1)
avgcount = n->second;
}
o<<" "<<name<<": ";
o << " " << i->first << ": ";
s32 clampsize = 40;
s32 space = clampsize - name.size();
for(s32 j=0; j<space; j++)
{
if(j%2 == 0 && j < space - 1)
o<<"-";
s32 space = clampsize - i->first.size();
for(s32 j = 0; j < space; j++) {
if (j % 2 == 0 && j < space - 1)
o << "-";
else
o<<" ";
o << " ";
}
o<<(i->second / avgcount);
o<<std::endl;
o << (i->second / avgcount);
o << std::endl;
}
}