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xo-alloc: track GC efficiency

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This commit is contained in:
Roland Conybeare 2025-08-23 13:09:59 -04:00
commit b6d7f9762e
3 changed files with 44 additions and 11 deletions
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11
xo-alloc/include/xo/alloc/GcStatistics.hpp
View file

@ -176,6 +176,17 @@ namespace xo {
dt_{dt} {}
constexpr GcStatisticsHistoryItem(const GcStatisticsHistoryItem &) = default;
std::size_t garbage_z() const { return garbage0_z_ + garbage1_z_ + garbageN_z_; }
float efficiency() const {
std::size_t gz = this->garbage_z();
return gz / static_cast<float>(effort_z_ + gz);
}
/** collection rate, in bytes/sec **/
float collection_rate() const;
GcStatisticsHistoryItem & operator=(const GcStatisticsHistoryItem & x) {
gc_seq_ = x.gc_seq_;
upto_ = x.upto_;

17
xo-alloc/src/alloc/GcStatistics.cpp
View file

@ -103,6 +103,23 @@ namespace xo {
<< ">";
}
float
GcStatisticsHistoryItem::collection_rate() const {
using namespace xo::qty::qty;
float gz = this->garbage_z();
auto dt_nanos = this->dt_.with_repr<float>();
auto dt_sec = dt_nanos.rescale_ext<xo::qty::u::second>();
auto rate = gz / dt_sec;
float retval = rate.scale();
//scope log(XO_DEBUG(true));
//log && log(xtag("gz", gz), xtag("dt_sec", dt_sec), xtag("rate", rate), xtag("rate/sec", retval));
return retval;
}
void
GcStatisticsHistoryItem::display(std::ostream & os) const
{

27
xo-imgui/example/ex2/imgui_ex2.cpp
View file

@ -642,13 +642,13 @@ enum class gc_history_headline {
N
};
xo::flatstring<256>
xo::flatstring<512>
write_gc_history_tooltip(gc_history_headline headline,
const GcStatisticsHistoryItem & stats)
{
xo::flatstring<256> retval;
xo::flatstring<512> retval;
xo::flatstring<256> headline_str;
xo::flatstring<512> headline_str;
switch (headline) {
case gc_history_headline::survive:
snprintf(headline_str.data(), headline_str.capacity(),
@ -685,6 +685,8 @@ write_gc_history_tooltip(gc_history_headline headline,
break;
}
snprintf(retval.data(), retval.capacity(),
"%s\n"
"\n"
@ -697,7 +699,8 @@ write_gc_history_tooltip(gc_history_headline headline,
" garbage\u2080: %lu\n" /*garbage0*/
" garbage\u2081: %lu\n" /*garbage1*/
" garbage\u2099: %lu\n" /*garbageN*/
" effort: %lu dt: %.1lfus\n",
" effort: %lu dt: %.1lfus\n"
" copy efficiency: %.1lf%% collection rate: %.0lf bytes/sec",
headline_str.c_str(),
stats.gc_seq_,
(stats.upto_ == generation::nursery) ? "incremental" : "FULL",
@ -709,7 +712,9 @@ write_gc_history_tooltip(gc_history_headline headline,
stats.garbage1_z_,
stats.garbageN_z_,
stats.effort_z_,
1e-3 * stats.dt_.scale()
1e-3 * stats.dt_.scale(),
100.0 * stats.efficiency(),
stats.collection_rate()
);
return retval.ensure_final_null();
@ -815,7 +820,7 @@ draw_gc_history(const GcStateDescription & gcstate,
float ypsz_lo = (y_zero
- (display_h * stats.persist_z_ / y_scale));
{
xo::flatstring<256> tt = write_gc_history_tooltip(gc_history_headline::persist, stats);
xo::flatstring<512> tt = write_gc_history_tooltip(gc_history_headline::persist, stats);
draw_filled_rect(tt.c_str(),
ImRect::from_xy_span(x_span, ImVec2(ypsz_lo, y_zero)),
@ -827,7 +832,7 @@ draw_gc_history(const GcStateDescription & gcstate,
float yp_lo = (yp_hi
- (display_h * stats.promote_z_ / y_scale));
{
xo::flatstring<256> tt = write_gc_history_tooltip(gc_history_headline::promote, stats);
xo::flatstring<512> tt = write_gc_history_tooltip(gc_history_headline::promote, stats);
draw_filled_rect(tt.c_str(),
ImRect::from_xy_span(x_span, ImVec2(yp_lo, yp_hi)),
@ -839,7 +844,7 @@ draw_gc_history(const GcStateDescription & gcstate,
float ys_hi = yp_lo;
float ys_lo = (ys_hi - (display_h * stats.survive_z_ / y_scale));
{
xo::flatstring<256> tt = write_gc_history_tooltip(gc_history_headline::survive, stats);
xo::flatstring<512> tt = write_gc_history_tooltip(gc_history_headline::survive, stats);
draw_filled_rect(tt.c_str(),
ImRect::from_xy_span(x_span, ImVec2(ys_lo, ys_hi)),
@ -854,7 +859,7 @@ draw_gc_history(const GcStateDescription & gcstate,
float ygN_hi = (y_zero
+ (display_h * stats.garbageN_z_ / y_scale));
{
xo::flatstring<256> tt = write_gc_history_tooltip(gc_history_headline::garbageN, stats);
xo::flatstring<512> tt = write_gc_history_tooltip(gc_history_headline::garbageN, stats);
draw_filled_rect(tt.c_str(),
ImRect::from_xy_span(x_span, ImVec2(ygN_lo, ygN_hi)),
@ -867,7 +872,7 @@ draw_gc_history(const GcStateDescription & gcstate,
float yg1_hi = (yg1_lo
+ (display_h * stats.garbage1_z_ / y_scale));
{
xo::flatstring<256> tt = write_gc_history_tooltip(gc_history_headline::garbage1, stats);
xo::flatstring<512> tt = write_gc_history_tooltip(gc_history_headline::garbage1, stats);
draw_filled_rect(tt.c_str(),
ImRect(ImVec2(x_lo, yg1_lo), ImVec2(x_hi, yg1_hi)),
@ -880,7 +885,7 @@ draw_gc_history(const GcStateDescription & gcstate,
float yg0_hi = (yg0_lo
+ (display_h * stats.garbage0_z_ / y_scale));
{
xo::flatstring<256> tt = write_gc_history_tooltip(gc_history_headline::garbage0, stats);
xo::flatstring<512> tt = write_gc_history_tooltip(gc_history_headline::garbage0, stats);
draw_filled_rect(tt.c_str(),
ImRect(ImVec2(x_lo, yg0_lo), ImVec2(x_hi, yg0_hi)),