58 const double time_since_last_gc = ZStatCycle::time_since_last();
59 const double time_until_gc = ZCollectionInterval - time_since_last_gc;
60
61 log_debug(gc, director)("Rule: Timer, Interval: %us, TimeUntilGC: %.3fs",
62 ZCollectionInterval, time_until_gc);
63
64 return time_until_gc <= 0;
65 }
66
67 bool ZDirector::rule_warmup() const {
68 if (ZStatCycle::is_warm()) {
69 // Rule disabled
70 return false;
71 }
72
73 // Perform GC if heap usage passes 10/20/30% and no other GC has been
74 // performed yet. This allows us to get some early samples of the GC
75 // duration, which is needed by the other rules.
76 const size_t max_capacity = ZHeap::heap()->soft_max_capacity();
77 const size_t used = ZHeap::heap()->used();
78 const double used_threshold_percent = (ZStatCycle::ncycles() + 1) * 0.1;
79 const size_t used_threshold = max_capacity * used_threshold_percent;
80
81 log_debug(gc, director)("Rule: Warmup %.0f%%, Used: " SIZE_FORMAT "MB, UsedThreshold: " SIZE_FORMAT "MB",
82 used_threshold_percent * 100, used / M, used_threshold / M);
83
84 return used >= used_threshold;
85 }
86
87 bool ZDirector::rule_allocation_rate() const {
88 if (ZStatCycle::is_first()) {
89 // Rule disabled
90 return false;
91 }
92
93 // Perform GC if the estimated max allocation rate indicates that we
94 // will run out of memory. The estimated max allocation rate is based
95 // on the moving average of the sampled allocation rate plus a safety
96 // margin based on variations in the allocation rate and unforeseen
97 // allocation spikes.
98
99 // Calculate amount of free memory available to Java threads. Note that
100 // the heap reserve is not available to Java threads and is therefore not
101 // considered part of the free memory.
102 const size_t max_capacity = ZHeap::heap()->soft_max_capacity();
103 const size_t max_reserve = ZHeap::heap()->max_reserve();
104 const size_t used = ZHeap::heap()->used();
105 const size_t free_with_reserve = max_capacity - MIN2(max_capacity, used);
106 const size_t free = free_with_reserve - MIN2(free_with_reserve, max_reserve);
107
108 // Calculate time until OOM given the max allocation rate and the amount
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58 const double time_since_last_gc = ZStatCycle::time_since_last();
59 const double time_until_gc = ZCollectionInterval - time_since_last_gc;
60
61 log_debug(gc, director)("Rule: Timer, Interval: %us, TimeUntilGC: %.3fs",
62 ZCollectionInterval, time_until_gc);
63
64 return time_until_gc <= 0;
65 }
66
67 bool ZDirector::rule_warmup() const {
68 if (ZStatCycle::is_warm()) {
69 // Rule disabled
70 return false;
71 }
72
73 // Perform GC if heap usage passes 10/20/30% and no other GC has been
74 // performed yet. This allows us to get some early samples of the GC
75 // duration, which is needed by the other rules.
76 const size_t max_capacity = ZHeap::heap()->soft_max_capacity();
77 const size_t used = ZHeap::heap()->used();
78 const double used_threshold_percent = (ZStatCycle::nwarmup_cycles() + 1) * 0.1;
79 const size_t used_threshold = max_capacity * used_threshold_percent;
80
81 log_debug(gc, director)("Rule: Warmup %.0f%%, Used: " SIZE_FORMAT "MB, UsedThreshold: " SIZE_FORMAT "MB",
82 used_threshold_percent * 100, used / M, used_threshold / M);
83
84 return used >= used_threshold;
85 }
86
87 bool ZDirector::rule_allocation_rate() const {
88 if (!ZStatCycle::is_normalized_duration_trustable()) {
89 // Rule disabled
90 return false;
91 }
92
93 // Perform GC if the estimated max allocation rate indicates that we
94 // will run out of memory. The estimated max allocation rate is based
95 // on the moving average of the sampled allocation rate plus a safety
96 // margin based on variations in the allocation rate and unforeseen
97 // allocation spikes.
98
99 // Calculate amount of free memory available to Java threads. Note that
100 // the heap reserve is not available to Java threads and is therefore not
101 // considered part of the free memory.
102 const size_t max_capacity = ZHeap::heap()->soft_max_capacity();
103 const size_t max_reserve = ZHeap::heap()->max_reserve();
104 const size_t used = ZHeap::heap()->used();
105 const size_t free_with_reserve = max_capacity - MIN2(max_capacity, used);
106 const size_t free = free_with_reserve - MIN2(free_with_reserve, max_reserve);
107
108 // Calculate time until OOM given the max allocation rate and the amount
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