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Compute Find zone std dev from the displayed distribution.

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The raw sumSq paired with a self/running mean yielded the raw variance
inflated by the squared mean gap. Accumulate the vector's own sum of
squares alongside its sum, like compare and frame statistics do.
This commit is contained in:
Bartosz Taudul
2026-09-09 21:13:14 +02:00
parent 82790f904f
commit f60889e1a7
2 changed files with 12 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
profiler/src/profiler/TracyView.hpp
+2
View File
@@ -802,6 +802,7 @@ private:
float median, selMedian;
float p75, p90, p99, p99_9;
int64_t total, selTotal;
double sumSq = 0;
int64_t selTime;
bool drawAvgMed = true;
bool drawSelAvgMed = true;
@@ -849,6 +850,7 @@ private:
p99 = 0;
p99_9 = 0;
total = 0;
sumSq = 0;
tmin = std::numeric_limits<int64_t>::max();
tmax = std::numeric_limits<int64_t>::min();
}
profiler/src/profiler/TracyView_FindZone.cpp
+10 -2
View File
@@ -433,6 +433,7 @@ void View::DrawFindZone()
int64_t tmin = m_findZone.tmin;
int64_t tmax = m_findZone.tmax;
int64_t total = m_findZone.total;
double sumSq = m_findZone.sumSq;
const auto zsz = zones.size();
if( m_findZone.sortedNum != zsz )
{
@@ -455,6 +456,7 @@ void View::DrawFindZone()
if( !GetZoneRunningTime( ctx, zone, t ) ) break;
vec.push_back_no_space_check( t );
total += t;
sumSq += double( t ) * t;
if( t < tmin ) tmin = t;
else if( t > tmax ) tmax = t;
}
@@ -470,6 +472,7 @@ void View::DrawFindZone()
if( !GetZoneRunningTime( ctx, zone, t ) ) break;
vec.push_back_no_space_check( t );
total += t;
sumSq += double( t ) * t;
if( t < tmin ) tmin = t;
else if( t > tmax ) tmax = t;
}
@@ -490,6 +493,7 @@ void View::DrawFindZone()
const auto t = end - start - GetZoneChildTimeFast( zone );
vec.push_back_no_space_check( t );
total += t;
sumSq += double( t ) * t;
}
}
else
@@ -501,6 +505,7 @@ void View::DrawFindZone()
const auto t = end - zone.Start() - GetZoneChildTimeFast( zone );
vec.push_back_no_space_check( t );
total += t;
sumSq += double( t ) * t;
}
}
}
@@ -519,6 +524,7 @@ void View::DrawFindZone()
const auto t = end - start;
vec.push_back_no_space_check( t );
total += t;
sumSq += double( t ) * t;
}
}
else
@@ -530,6 +536,7 @@ void View::DrawFindZone()
const auto t = end - zone.Start();
vec.push_back_no_space_check( t );
total += t;
sumSq += double( t ) * t;
}
}
}
@@ -552,6 +559,7 @@ void View::DrawFindZone()
m_findZone.p99 = Percentile( 0.99 );
m_findZone.p99_9 = Percentile( 0.999 );
m_findZone.total = total;
m_findZone.sumSq = sumSq;
m_findZone.sortedNum = i;
m_findZone.tmin = tmin;
m_findZone.tmax = tmax;
@@ -734,7 +742,7 @@ void View::DrawFindZone()
{
const auto sz = m_findZone.sorted.size();
const auto avg = m_findZone.average;
const auto ss = zoneData.sumSq - 2. * zoneData.total * avg + avg * avg * sz;
const auto ss = m_findZone.sumSq - 2. * m_findZone.total * avg + double( avg ) * avg * sz;
const auto sd = sqrt( ss / ( sz - 1 ) );
json["statistics"]["std_dev"] = TimeToString( sd );
}
@@ -1118,7 +1126,7 @@ void View::DrawFindZone()
{
const auto sz = m_findZone.sorted.size();
const auto avg = m_findZone.average;
const auto ss = zoneData.sumSq - 2. * zoneData.total * avg + double( avg ) * avg * sz;
const auto ss = m_findZone.sumSq - 2. * m_findZone.total * avg + double( avg ) * avg * sz;
const auto sd = sqrt( ss / ( sz - 1 ) );
ImGui::SameLine();