1 // ******************************************************************************
2 //
3 // Title: Force Field X.
4 // Description: Force Field X - Software for Molecular Biophysics.
5 // Copyright: Copyright (c) Michael J. Schnieders 2001-2024.
6 //
7 // This file is part of Force Field X.
8 //
9 // Force Field X is free software; you can redistribute it and/or modify it
10 // under the terms of the GNU General Public License version 3 as published by
11 // the Free Software Foundation.
12 //
13 // Force Field X is distributed in the hope that it will be useful, but WITHOUT
14 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15 // FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
16 // details.
17 //
18 // You should have received a copy of the GNU General Public License along with
19 // Force Field X; if not, write to the Free Software Foundation, Inc., 59 Temple
20 // Place, Suite 330, Boston, MA 02111-1307 USA
21 //
22 // Linking this library statically or dynamically with other modules is making a
23 // combined work based on this library. Thus, the terms and conditions of the
24 // GNU General Public License cover the whole combination.
25 //
26 // As a special exception, the copyright holders of this library give you
27 // permission to link this library with independent modules to produce an
28 // executable, regardless of the license terms of these independent modules, and
29 // to copy and distribute the resulting executable under terms of your choice,
30 // provided that you also meet, for each linked independent module, the terms
31 // and conditions of the license of that module. An independent module is a
32 // module which is not derived from or based on this library. If you modify this
33 // library, you may extend this exception to your version of the library, but
34 // you are not obligated to do so. If you do not wish to do so, delete this
35 // exception statement from your version.
36 //
37 // ******************************************************************************
38 package ffx.utilities;
39
40 import static java.lang.Runtime.getRuntime;
41 import static java.lang.String.format;
42 import static java.lang.management.ManagementFactory.getOperatingSystemMXBean;
43
44 import com.sun.management.UnixOperatingSystemMXBean;
45 import java.lang.management.OperatingSystemMXBean;
46 import java.util.logging.Level;
47 import java.util.logging.Logger;
48
49 /**
50 * Log resources.
51 *
52 * @author Michael J. Schnieders
53 * @since 1.0
54 */
55 public class Resources {
56
57 private static final Logger logger = Logger.getLogger(Resources.class.getName());
58
59 /**
60 * Private constructor to prevent instantiation.
61 */
62 private Resources() {
63 // Empty constructor.
64 }
65
66 /**
67 * Log resources.
68 */
69 public static void logResources() {
70 if (logger.isLoggable(Level.INFO)) {
71 StringBuilder sb = new StringBuilder("\n System Resources\n");
72
73 Runtime runtime = getRuntime();
74 runtime.gc();
75
76 long MB = 1024 * 1024;
77 OperatingSystemMXBean operatingSystemMXBean = getOperatingSystemMXBean();
78
79 if (operatingSystemMXBean instanceof UnixOperatingSystemMXBean unixOS) {
80 // CPU Time and Average System Load.
81 long time = unixOS.getProcessCpuTime();
82 sb.append(format(" Total CPU time: %6.2f (sec)\n", time * 1.0e-9));
83 double systemLoadAve = unixOS.getSystemLoadAverage();
84 if (systemLoadAve >= 0) {
85 sb.append(format(" System load average: %6.2f\n", systemLoadAve));
86 }
87 // File handle use.
88 long open = unixOS.getOpenFileDescriptorCount();
89 long allowed = unixOS.getMaxFileDescriptorCount();
90 sb.append(format(" Open file handles: %6d of %6d allowed\n", open, allowed));
91
92 // System Memory.
93 long freePhysical = unixOS.getFreeMemorySize() / MB;
94 long totalPhysical = unixOS.getTotalMemorySize() / MB;
95 long freeSwap = unixOS.getFreeSwapSpaceSize() / MB;
96 long totalSwap = unixOS.getTotalSwapSpaceSize() / MB;
97 sb.append(format(" System memory: %6d MB free out of %6d MB\n", freePhysical,
98 totalPhysical));
99 sb.append(
100 format(" System swap space: %6d MB free out of %6d MB\n", freeSwap, totalSwap));
101 }
102
103 // JVM Memory.
104 sb.append(
105 format(" JVM memory: %6d MB free out of %6d MB", runtime.freeMemory() / MB,
106 runtime.totalMemory() / MB));
107
108 logger.info(sb.toString());
109 }
110 }
111 }