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feat(mcp): read plot samples by time window

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get_plots only summarises a whole trace, so a plot could not be
compared across windows. get_plot_samples returns the (time, value)
pairs in a range, thinned to a maximum count, and
get_plot_window_stats returns count, min, max and average over just
that range.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L3DnWkXakGRgz9C8BaLM47
This commit is contained in:
Alan Tse
2026-10-27 10:04:47 -07:00
co-authored by Claude Sonnet 5.5
parent 1f4c53574b
commit 0ea62d9551
3 changed files with 95 additions and 0 deletions
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python/bindings/ServerModule.cpp
+42
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@@ -1,5 +1,7 @@
#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
#include <algorithm>
#include <limits>
#include <unordered_map>
#ifdef _MSC_VER
@@ -1016,6 +1018,46 @@ PYBIND11_MODULE( TracyServerBindings, m )
return result;
} ) )
.def( "get_plot_samples", locked( +[]( const Worker& w, const std::string& name, int64_t startNs, int64_t endNs, size_t maxSamples ) {
std::vector<std::pair<int64_t, double>> result;
for( const auto* pd : w.GetPlots() )
{
if( !pd || w.GetString( pd->name ) != name ) continue;
auto first = std::lower_bound( pd->data.begin(), pd->data.end(), startNs,
[]( const PlotItem& item, int64_t t ) { return item.time.Val() < t; } );
auto last = std::lower_bound( first, pd->data.end(), endNs,
[]( const PlotItem& item, int64_t t ) { return item.time.Val() < t; } );
const size_t n = last - first;
const size_t step = maxSamples && n > maxSamples ? ( n + maxSamples - 1 ) / maxSamples : 1;
for( auto it = first; it < last; it += std::min<size_t>( step, last - it ) )
result.emplace_back( it->time.Val(), it->val );
break;
}
return result;
} ), py::arg( "name" ), py::arg( "start_ns" ) = 0, py::arg( "end_ns" ) = std::numeric_limits<int64_t>::max(), py::arg( "max_samples" ) = 100000 )
.def( "get_plot_window_stats", locked( +[]( const Worker& w, const std::string& name, int64_t startNs, int64_t endNs ) {
PlotSummary result{ name, 0, 0, 0, 0, 0, "User" };
static const char* plotTypeStr[] = { "User", "Memory", "SysTime", "Power" };
for( const auto* pd : w.GetPlots() )
{
if( !pd || w.GetString( pd->name ) != name ) continue;
result.type = (uint8_t)pd->type < 4 ? plotTypeStr[(uint8_t)pd->type] : "Unknown";
auto first = std::lower_bound( pd->data.begin(), pd->data.end(), startNs,
[]( const PlotItem& item, int64_t t ) { return item.time.Val() < t; } );
for( auto it = first; it != pd->data.end() && it->time.Val() < endNs; ++it )
{
if( result.count == 0 || it->val < result.min ) result.min = it->val;
if( result.count == 0 || it->val > result.max ) result.max = it->val;
result.sum += it->val;
result.count++;
}
result.avg = result.count ? result.sum / result.count : 0.0;
break;
}
return result;
} ), py::arg( "name" ), py::arg( "start_ns" ) = 0, py::arg( "end_ns" ) = std::numeric_limits<int64_t>::max() )
// --- Memory pools ---
.def( "get_memory_pools", locked( +[]( const Worker& w ) {
std::vector<MemPoolSummary> result;