void ObjectMemory::young_autotune() {
if(young_autotune_size) {
// We autotune the size if we do multiple young
// collections during a mature mark phase. This indicates
// that memory pressure is higher and we might want to grow
// if we haven't met the young size factor yet.
//
// If we don't see any young GC's we check if we should shrink it
if(young_gc_while_marking_ > 1) {
if(young_->bytes_size() < young_max_bytes &&
young_->bytes_size() < mature_bytes_allocated() / young_autotune_factor) {
young_->grow(young_->bytes_size() * 2);
}
} else if(young_gc_while_marking_ == 0) {
if(young_->bytes_size() > mature_bytes_allocated() / young_autotune_factor) {
young_->grow(young_->bytes_size() / 2);
}
}
}
}
void ObjectMemory::print_mature_stats(STATE, GCData* data) {
if(state->shared().config.gc_show) {
uint64_t stop = gc_stats.last_full_stop_collection_time.value;
uint64_t concur = gc_stats.last_full_concurrent_collection_time.value;
size_t before_mature_kb = data->mature_bytes_allocated() / 1024;
size_t mature_kb = mature_bytes_allocated() / 1024;
size_t before_code_kb = data->code_bytes_allocated() / 1024;
size_t code_kb = code_bytes_allocated() / 1024;
std::cerr << "[Full GC mature: " << before_mature_kb << "kB => " << mature_kb << "kB, ";
std::cerr << "code: " << before_code_kb << "kB => " << code_kb << "kB, ";
std::cerr << "symbols: " << data->symbol_bytes_allocated() / 1024 << "kB, ";
std::cerr << "jit: " << data->jit_bytes_allocated() / 1024 << "kB, ";
std::cerr << "time: " << stop << "ms (" << concur << "ms), ";
std::cerr << capi_handles_->size() << " C-API handles, " << inflated_headers_->size() << " inflated headers]" << std::endl;
if(state->shared().config.gc_noisy) {
std::cerr << "\a\a" << std::flush;
}
}
}
void ObjectMemory::collect_maybe(STATE, GCToken gct, CallFrame* call_frame) {
// Don't go any further unless we're allowed to GC.
if(!can_gc()) return;
while(!state->stop_the_world()) {
state->checkpoint(gct, call_frame);
// Someone else got to the GC before we did! No problem, all done!
if(!collect_young_now && !collect_mature_now) return;
}
// Ok, everyone in stopped! LET'S GC!
SYNC(state);
state->shared().finalizer_handler()->start_collection(state);
if(cDebugThreading) {
std::cerr << std::endl << "[" << state
<< " WORLD beginning GC.]" << std::endl;
}
GCData gc_data(state->vm(), gct);
uint64_t start_time = 0;
if(collect_young_now) {
if(state->shared().config.gc_show) {
start_time = get_current_time();
}
YoungCollectStats stats;
#ifdef RBX_PROFILER
if(unlikely(state->vm()->tooling())) {
tooling::GCEntry method(state, tooling::GCYoung);
collect_young(gc_data, &stats);
} else {
collect_young(gc_data, &stats);
}
#else
collect_young(gc_data, &stats);
#endif
if(state->shared().config.gc_show) {
uint64_t fin_time = get_current_time();
int diff = (fin_time - start_time) / 1000000;
std::cerr << "[GC " << std::fixed << std::setprecision(1) << stats.percentage_used << "% "
<< stats.promoted_objects << "/" << stats.excess_objects << " "
<< stats.lifetime << " " << diff << "ms]" << std::endl;
if(state->shared().config.gc_noisy) {
std::cerr << "\a" << std::flush;
}
}
}
if(collect_mature_now) {
size_t before_kb = 0;
if(state->shared().config.gc_show) {
start_time = get_current_time();
before_kb = mature_bytes_allocated() / 1024;
}
#ifdef RBX_PROFILER
if(unlikely(state->vm()->tooling())) {
tooling::GCEntry method(state, tooling::GCMature);
collect_mature(gc_data);
} else {
collect_mature(gc_data);
}
#else
collect_mature(gc_data);
#endif
if(state->shared().config.gc_show) {
uint64_t fin_time = get_current_time();
int diff = (fin_time - start_time) / 1000000;
size_t kb = mature_bytes_allocated() / 1024;
std::cerr << "[Full GC " << before_kb << "kB => " << kb << "kB " << diff << "ms]" << std::endl;
if(state->shared().config.gc_noisy) {
std::cerr << "\a\a" << std::flush;
}
}
}
state->shared().finalizer_handler()->finish_collection(state);
state->restart_world();
UNSYNC;
}