Mercurial > hg > truffle
view src/share/vm/runtime/timer.hpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Wed, 23 Dec 2009 09:23:54 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
line wrap: on
line source
/* * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // Timers for simple measurement. class elapsedTimer VALUE_OBJ_CLASS_SPEC { friend class VMStructs; private: jlong _counter; jlong _start_counter; bool _active; public: elapsedTimer() { _active = false; reset(); } void add(elapsedTimer t); void start(); void stop(); void reset() { _counter = 0; } double seconds() const; jlong milliseconds() const; jlong ticks() const { return _counter; } jlong active_ticks() const; bool is_active() const { return _active; } }; // TimeStamp is used for recording when an event took place. class TimeStamp VALUE_OBJ_CLASS_SPEC { private: jlong _counter; public: TimeStamp() { _counter = 0; } void clear() { _counter = 0; } // has the timestamp been updated since being created or cleared? bool is_updated() const { return _counter != 0; } // update to current elapsed time void update(); // update to given elapsed time void update_to(jlong ticks); // returns seconds since updated // (must not be in a cleared state: must have been previously updated) double seconds() const; jlong milliseconds() const; // ticks elapsed between VM start and last update jlong ticks() const { return _counter; } // ticks elapsed since last update jlong ticks_since_update() const; }; // TraceTime is used for tracing the execution time of a block // Usage: // { TraceTime t("block time") // some_code(); // } // class TraceTime: public StackObj { private: bool _active; // do timing bool _verbose; // report every timing bool _print_cr; // add a CR to the end of the timer report elapsedTimer _t; // timer elapsedTimer* _accum; // accumulator outputStream* _logfile; // output log file public: // Constuctors TraceTime(const char* title, bool doit = true, bool print_cr = true, outputStream *logfile = NULL); TraceTime(const char* title, elapsedTimer* accumulator, bool doit = true, bool verbose = false, outputStream *logfile = NULL ); ~TraceTime(); // Accessors void set_verbose(bool verbose) { _verbose = verbose; } bool verbose() const { return _verbose; } // Activation void suspend() { if (_active) _t.stop(); } void resume() { if (_active) _t.start(); } }; class TraceCPUTime: public StackObj { private: bool _active; // true if times will be measured and printed bool _print_cr; // if true print carriage return at end double _starting_user_time; // user time at start of measurement double _starting_system_time; // system time at start of measurement double _starting_real_time; // real time at start of measurement outputStream* _logfile; // output is printed to this stream bool _error; // true if an error occurred, turns off output public: TraceCPUTime(bool doit = true, bool print_cr = true, outputStream *logfile = NULL); ~TraceCPUTime(); };