public static String getMemoryInformation() { Runtime rt = Runtime.getRuntime(); DecimalFormat df = new DecimalFormat("###,###,###,###"); return "used = " + df.format(rt.totalMemory() - rt.freeMemory()) + " free = " + rt.freeMemory() + " total = " + rt.totalMemory() + " max = " + rt.maxMemory(); }
public static void main(String[] args) throws Exception{ //free和use和total均为KB long free=0; long use=0; long total=0; int kb=1024; Runtime rt=Runtime.getRuntime(); total=rt.totalMemory(); free=rt.freeMemory(); use=total-free; System.out.println("系统内存已用的空间为:"+use/kb+" MB"); System.out.println("系统内存的空闲空间为:"+free/kb+" MB"); System.out.println("系统总内存空间为:"+total/kb+" MB"); OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean(); long physicalFree=osmxb.getFreePhysicalMemorySize()/kb; long physicalTotal=osmxb.getTotalPhysicalMemorySize()/kb; long physicalUse=physicalTotal-physicalFree; String os=System.getProperty("os.name"); System.out.println("操作系统的版本:"+os); System.out.println("系统物理内存已用的空间为:"+physicalFree+" MB"); System.out.println("系统物理内存的空闲空间为:"+physicalUse+" MB"); System.out.println("总物理内存:"+physicalTotal+" MB"); // 获得线程总数 ThreadGroup parentThread; for (parentThread = Thread.currentThread().getThreadGroup(); parentThread.getParent() != null; parentThread = parentThread.getParent()) ; int totalThread = parentThread.activeCount(); System.out.println("获得线程总数:"+totalThread); }
private void handleException(Realm realm, OutOfMemoryError e) { // Try to recover after OOM. Runtime rt = Runtime.getRuntime(); long beforeGc = rt.freeMemory(); rt.gc(); long afterGc = rt.freeMemory(); if (afterGc > beforeGc && (afterGc - beforeGc) < 50_000_000) { // Calling gc() cleared less than 50MB, assume unrecoverable OOM and rethrow error. throw e; } // Create script exception with stacktrace from oom-error. ScriptException exception = newInternalError(realm.defaultContext(), Messages.Key.OutOfMemoryVM); exception.setStackTrace(e.getStackTrace()); handleException(realm, exception); }
public static void fullGC(boolean verbose) { if (verbose) System.out.print( new Date().toString() + ' ' + String.valueOf((RUNTIME.totalMemory() - RUNTIME.freeMemory()) / 1024L) + "Kb used"); long isFree = RUNTIME.freeMemory(); long wasFree; do { wasFree = isFree; RUNTIME.runFinalization(); RUNTIME.gc(); isFree = RUNTIME.freeMemory(); } while (isFree > wasFree); if (verbose) System.out.println( " --> " + String.valueOf((RUNTIME.totalMemory() - RUNTIME.freeMemory()) / 1024L) + "Kb used"); }
@Override public DiskData build() throws IOException { meta.assign(parser); meta.dirty = true; // calculate optimized output buffer sizes to reduce disk fragmentation final Runtime rt = Runtime.getRuntime(); final long max = Math.min(1 << 22, rt.maxMemory() - rt.freeMemory() >> 2); int bs = (int) Math.min(meta.filesize, max); bs = Math.max(IO.BLOCKSIZE, bs - bs % IO.BLOCKSIZE); // drop old database (if available) and create new one DropDB.drop(dbname, sopts); sopts.dbpath(dbname).md(); elemNames = new Names(meta); attrNames = new Names(meta); try { tout = new DataOutput(new TableOutput(meta, DATATBL)); xout = new DataOutput(meta.dbfile(DATATXT), bs); vout = new DataOutput(meta.dbfile(DATAATV), bs); sout = new DataOutput(meta.dbfile(DATATMP), bs); final Performance perf = Prop.debug ? new Performance() : null; Util.debug(tit() + DOTS); parse(); if (Prop.debug) Util.errln(" " + perf + " (" + Performance.getMemory() + ')'); } catch (final IOException ex) { try { close(); } catch (final IOException ignored) { } throw ex; } close(); // copy temporary values into database table try (final DataInput in = new DataInput(meta.dbfile(DATATMP))) { final TableAccess ta = new TableDiskAccess(meta, true); for (; spos < ssize; ++spos) ta.write4(in.readNum(), 8, in.readNum()); ta.close(); } meta.dbfile(DATATMP).delete(); // return database instance return new DiskData(meta, elemNames, attrNames, path, ns); }
private void doClean(timerEvent ev) { // Cleaner event if (VERBOSE) System.err.println("-- Cleaning up packetTable"); // Might cause some recent packets to be dropped packetTable.clear(); if (VERBOSE) { Runtime r = Runtime.getRuntime(); System.err.println( "TOTAL: " + r.totalMemory() / 1024 + "KB FREE: " + r.freeMemory() / 1024 + "KB"); } // Reregister timer event timer.registerEvent(CLEAN_TIMER_FREQUENCY, ev, mySink); }
public String toString() { String result = "f=" + (runtime.freeMemory() / MEGA) + "/"; result += "t=" + (runtime.totalMemory() / MEGA) + "/"; result += "m=" + (runtime.maxMemory() / MEGA) + "Mb"; return result; }
public static long getUsedMemory() { Runtime rt = Runtime.getRuntime(); return rt.totalMemory() - rt.freeMemory(); }