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Java example source code file (nmtDCmd.cpp)

This example Java source code file (nmtDCmd.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

baselinettyoutputer, boolean, memtracker\:\:compare_memory_usage, memtracker\:\:has_baseline, memtracker\:\:print_memory_usage, nmtdcmd, nmtdcmd\:\:nmtdcmd, product, traps

The nmtDCmd.cpp Java example source code

/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */
#include "precompiled.hpp"
#include "services/nmtDCmd.hpp"
#include "services/memReporter.hpp"
#include "services/memTracker.hpp"
#include "utilities/globalDefinitions.hpp"

NMTDCmd::NMTDCmd(outputStream* output,
  bool heap): DCmdWithParser(output, heap),
  _summary("summary", "request runtime to report current memory summary, " \
           "which includes total reserved and committed memory, along " \
           "with memory usage summary by each subsytem.",
           "BOOLEAN", false, "false"),
  _detail("detail", "request runtime to report memory allocation >= "
           "1K by each callsite.",
           "BOOLEAN", false, "false"),
  _baseline("baseline", "request runtime to baseline current memory usage, " \
            "so it can be compared against in later time.",
            "BOOLEAN", false, "false"),
  _summary_diff("summary.diff", "request runtime to report memory summary " \
            "comparison against previous baseline.",
            "BOOLEAN", false, "false"),
  _detail_diff("detail.diff", "request runtime to report memory detail " \
            "comparison against previous baseline, which shows the memory " \
            "allocation activities at different callsites.",
            "BOOLEAN", false, "false"),
  _shutdown("shutdown", "request runtime to shutdown itself and free the " \
            "memory used by runtime.",
            "BOOLEAN", false, "false"),
  _auto_shutdown("autoShutdown", "automatically shutdown itself under "    \
            "stress situation",
            "BOOLEAN", true, "true"),
#ifndef PRODUCT
  _debug("debug", "print tracker statistics. Debug only, not thread safe", \
            "BOOLEAN", false, "false"),
#endif
  _scale("scale", "Memory usage in which scale, KB, MB or GB",
       "STRING", false, "KB") {
  _dcmdparser.add_dcmd_option(&_summary);
  _dcmdparser.add_dcmd_option(&_detail);
  _dcmdparser.add_dcmd_option(&_baseline);
  _dcmdparser.add_dcmd_option(&_summary_diff);
  _dcmdparser.add_dcmd_option(&_detail_diff);
  _dcmdparser.add_dcmd_option(&_shutdown);
  _dcmdparser.add_dcmd_option(&_auto_shutdown);
#ifndef PRODUCT
  _dcmdparser.add_dcmd_option(&_debug);
#endif
  _dcmdparser.add_dcmd_option(&_scale);
}

void NMTDCmd::execute(DCmdSource source, TRAPS) {
  const char* scale_value = _scale.value();
  size_t scale_unit;
  if (strcmp(scale_value, "KB") == 0 || strcmp(scale_value, "kb") == 0) {
    scale_unit = K;
  } else if (strcmp(scale_value, "MB") == 0 ||
             strcmp(scale_value, "mb") == 0) {
    scale_unit = M;
  } else if (strcmp(scale_value, "GB") == 0 ||
             strcmp(scale_value, "gb") == 0) {
    scale_unit = G;
  } else {
    output()->print_cr("Incorrect scale value: %s", scale_value);
    return;
  }

  int nopt = 0;
  if (_summary.is_set() && _summary.value()) { ++nopt; }
  if (_detail.is_set() && _detail.value()) { ++nopt; }
  if (_baseline.is_set() && _baseline.value()) { ++nopt; }
  if (_summary_diff.is_set() && _summary_diff.value()) { ++nopt; }
  if (_detail_diff.is_set() && _detail_diff.value()) { ++nopt; }
  if (_shutdown.is_set() && _shutdown.value()) { ++nopt; }
  if (_auto_shutdown.is_set()) { ++nopt; }

#ifndef PRODUCT
  if (_debug.is_set() && _debug.value()) { ++nopt; }
#endif

  if (nopt > 1) {
      output()->print_cr("At most one of the following option can be specified: " \
        "summary, detail, baseline, summary.diff, detail.diff, shutdown"
#ifndef PRODUCT
        ", debug"
#endif
      );
      return;
  } else if (nopt == 0) {
    if (_summary.is_set()) {
      output()->print_cr("No command to execute");
      return;
    } else {
      _summary.set_value(true);
    }
  }

#ifndef PRODUCT
  if (_debug.value()) {
    output()->print_cr("debug command is NOT thread-safe, may cause crash");
    MemTracker::print_tracker_stats(output());
    return;
  }
#endif

  // native memory tracking has to be on
  if (!MemTracker::is_on() || MemTracker::shutdown_in_progress()) {
    // if it is not on, what's the reason?
    output()->print_cr(MemTracker::reason());
    return;
  }

  if (_summary.value()) {
    BaselineTTYOutputer outputer(output());
    MemTracker::print_memory_usage(outputer, scale_unit, true);
  } else if (_detail.value()) {
    BaselineTTYOutputer outputer(output());
    MemTracker::print_memory_usage(outputer, scale_unit, false);
  } else if (_baseline.value()) {
    if (MemTracker::baseline()) {
      output()->print_cr("Successfully baselined.");
    } else {
      output()->print_cr("Baseline failed.");
    }
  } else if (_summary_diff.value()) {
    if (MemTracker::has_baseline()) {
      BaselineTTYOutputer outputer(output());
      MemTracker::compare_memory_usage(outputer, scale_unit, true);
    } else {
      output()->print_cr("No baseline to compare, run 'baseline' command first");
    }
  } else if (_detail_diff.value()) {
    if (MemTracker::has_baseline()) {
      BaselineTTYOutputer outputer(output());
      MemTracker::compare_memory_usage(outputer, scale_unit, false);
    } else {
      output()->print_cr("No baseline to compare to, run 'baseline' command first");
    }
  } else if (_shutdown.value()) {
    MemTracker::shutdown(MemTracker::NMT_shutdown_user);
    output()->print_cr("Shutdown is in progress, it will take a few moments to " \
      "completely shutdown");
  } else if (_auto_shutdown.is_set()) {
    MemTracker::set_autoShutdown(_auto_shutdown.value());
  } else {
    ShouldNotReachHere();
    output()->print_cr("Unknown command");
  }
}

int NMTDCmd::num_arguments() {
  ResourceMark rm;
  NMTDCmd* dcmd = new NMTDCmd(NULL, false);
  if (dcmd != NULL) {
    DCmdMark mark(dcmd);
    return dcmd->_dcmdparser.num_arguments();
  } else {
    return 0;
  }
}

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