Mercurial > hg > truffle

comparison src/share/vm/gc_implementation/shared/adaptiveSizePolicy.hpp @ 4095:bca17e38de00

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads Summary: Select number of GC threads dynamically based on heap usage and number of Java threads Reviewed-by: johnc, ysr, jcoomes
author jmasa
date Tue, 09 Aug 2011 10:16:01 -0700
parents f95d63e2154a
children d2a62e0f25eb
comparison
equal deleted inserted replaced
4094:3a298e04d914 4095:bca17e38de00
185 // gathered. The policy may use these counters as a threshhold 185 // gathered. The policy may use these counters as a threshhold
186 // for reliable data. 186 // for reliable data.
187 julong _young_gen_change_for_minor_throughput; 187 julong _young_gen_change_for_minor_throughput;
188 julong _old_gen_change_for_major_throughput; 188 julong _old_gen_change_for_major_throughput;
189 189
190 static const uint GCWorkersPerJavaThread = 2;
191
190 // Accessors 192 // Accessors
191 193
192 double gc_pause_goal_sec() const { return _gc_pause_goal_sec; } 194 double gc_pause_goal_sec() const { return _gc_pause_goal_sec; }
193 // The value returned is unitless: it's the proportion of time 195 // The value returned is unitless: it's the proportion of time
194 // spent in a particular collection type. 196 // spent in a particular collection type.
329 _decrement_tenuring_threshold_for_survivor_limit = v; 331 _decrement_tenuring_threshold_for_survivor_limit = v;
330 } 332 }
331 // Return true if the policy suggested a change. 333 // Return true if the policy suggested a change.
332 bool tenuring_threshold_change() const; 334 bool tenuring_threshold_change() const;
333 335
336 static bool _debug_perturbation;
337
334 public: 338 public:
335 AdaptiveSizePolicy(size_t init_eden_size, 339 AdaptiveSizePolicy(size_t init_eden_size,
336 size_t init_promo_size, 340 size_t init_promo_size,
337 size_t init_survivor_size, 341 size_t init_survivor_size,
338 double gc_pause_goal_sec, 342 double gc_pause_goal_sec,
339 uint gc_cost_ratio); 343 uint gc_cost_ratio);
344
345 // Return number default GC threads to use in the next GC.
346 static int calc_default_active_workers(uintx total_workers,
347 const uintx min_workers,
348 uintx active_workers,
349 uintx application_workers);
350
351 // Return number of GC threads to use in the next GC.
352 // This is called sparingly so as not to change the
353 // number of GC workers gratuitously.
354 // For ParNew collections
355 // For PS scavenge and ParOld collections
356 // For G1 evacuation pauses (subject to update)
357 // Other collection phases inherit the number of
358 // GC workers from the calls above. For example,
359 // a CMS parallel remark uses the same number of GC
360 // workers as the most recent ParNew collection.
361 static int calc_active_workers(uintx total_workers,
362 uintx active_workers,
363 uintx application_workers);
364
365 // Return number of GC threads to use in the next concurrent GC phase.
366 static int calc_active_conc_workers(uintx total_workers,
367 uintx active_workers,
368 uintx application_workers);
340 369
341 bool is_gc_cms_adaptive_size_policy() { 370 bool is_gc_cms_adaptive_size_policy() {
342 return kind() == _gc_cms_adaptive_size_policy; 371 return kind() == _gc_cms_adaptive_size_policy;
343 } 372 }
344 bool is_gc_ps_adaptive_size_policy() { 373 bool is_gc_ps_adaptive_size_policy() {