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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 0a19c8b043
2 changed files with 28 additions and 0 deletions
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11
include/xo/alloc/GcStatistics.hpp
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@ -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
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
{