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xo-alloc: + gc history xo-imgui: gui examples

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This commit is contained in:
Roland Conybeare 2025-08-14 09:50:59 -05:00
commit f4be2e765e
20 changed files with 2015 additions and 18 deletions
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66
xo-alloc/include/xo/alloc/GcStatistics.hpp
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@ -6,6 +6,7 @@
#pragma once
#include "generation.hpp"
#include "CircularBuffer.hpp"
#include "xo/reflect/TypeDescr.hpp"
#include "xo/indentlog/print/pretty.hpp"
#include <ostream>
@ -57,6 +58,8 @@ namespace xo {
**/
class GcStatistics {
public:
GcStatistics() = default;
/** update statistics after a GC cycle
* @param upto. nursery -> incremental collection; tenured -> full collection
* @param alloc_z. new allocations (since preceding GC)
@ -108,6 +111,7 @@ namespace xo {
**/
class GcStatisticsExt : public GcStatistics {
public:
GcStatisticsExt() = default;
explicit GcStatisticsExt(const GcStatistics & x) : GcStatistics{x} {}
/** @param os. write stats on this output stream **/
@ -128,6 +132,63 @@ namespace xo {
return os;
}
/** @class GcStatisticsHistoryItem
* @brief info we want to record over time (won't have cumulative things in it)
**/
class GcStatisticsHistoryItem {
public:
GcStatisticsHistoryItem() = default;
GcStatisticsHistoryItem(generation upto,
std::size_t new_alloc_z,
std::size_t survive_z,
std::size_t promote_z,
std::size_t persist_z,
std::size_t effort_z,
std::size_t garbage0_z,
std::size_t garbage1_z,
std::size_t garbageN_z)
: upto_{upto},
new_alloc_z_{new_alloc_z},
survive_z_{survive_z},
promote_z_{promote_z},
persist_z_{persist_z},
effort_z_{effort_z},
garbage0_z_{garbage0_z},
garbage1_z_{garbage1_z},
garbageN_z_{garbageN_z}
{}
/** @param os. write stats on this output stream **/
void display(std::ostream & os) const;
/** type of GC that generated this record **/
generation upto_;
/** #of bytes new allocation **/
std::size_t new_alloc_z_ = 0;
/** #of bytes surviving their first collection (i.e. N0->N1) **/
std::size_t survive_z_ = 0;
/** #of bytes promoted to tenured.
* Comprises all objects surviving their 2nd collection (i.e. N1->T)
**/
std::size_t promote_z_ = 0;
/** #of bytes surviving 3rd of later collection **/
std::size_t persist_z_ = 0;
/** #of bytes copied **/
std::size_t effort_z_ = 0;
/** #of bytes garbage from N0 (i.e. survived 0 GCs) **/
std::size_t garbage0_z_ = 0;
/** #of bytes garbage from N1 (i.e. survived 1 GCs) **/
std::size_t garbage1_z_ = 0;
/** #of bytes garbage from T (i.e. survived 2+ GCs) **/
std::size_t garbageN_z_ = 0;
};
inline std::ostream & operator<< (std::ostream & os, const GcStatisticsHistoryItem & x) {
x.display(os);
return os;
}
using GcStatisticsHistory = CircularBuffer<GcStatisticsHistoryItem>;
} /*namespace gc*/
namespace print {
@ -145,6 +206,11 @@ namespace xo {
struct ppdetail<xo::gc::GcStatisticsExt> {
static bool print_pretty(const ppindentinfo &, const xo::gc::GcStatisticsExt &);
};
template<>
struct ppdetail<xo::gc::GcStatisticsHistoryItem> {
static bool print_pretty(const ppindentinfo &, const xo::gc::GcStatisticsHistoryItem &);
};
} /*namespace print*/
} /*namespace xo*/