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Re: How Can I monitoring java heap with jstat?
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created by <a href="https://community.jboss.org/people/nikhilmone">Nikhil Mone</a> in <i>Performance Tuning</i> - <a href="https://community.jboss.org/message/778673#778673">View the full discussion</a>
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<div class="jive-rendered-content"><p>You can also try below command that gives you detail of entire memory usage :</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>=========================================</p><p>$ jmap -heap <Proces ID of your JVM></p><p>Attaching to process ID 29696, please wait...</p><p>Debugger attached successfully.</p><p>Server compiler detected.</p><p>JVM version is 20.6-b01</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>using thread-local object allocation.</p><p>Parallel GC with 4 thread(s)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Heap Configuration:</p><p>   MinHeapFreeRatio = 40</p><p>   MaxHeapFreeRatio = 70</p><p>   MaxHeapSize      = 1367343104 (1304.0MB)</p><p>   NewSize          = 1310720 (1.25MB)</p><p>   MaxNewSize       = 17592186044415 MB</p><p>   OldSize          = 5439488 (5.1875MB)</p><p>   NewRatio         = 2</p><p>   SurvivorRatio    = 8</p><p>   PermSize         = 21757952 (20.75MB)</p><p>   MaxPermSize      = 268435456 (256.0MB)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Heap Usage:</p><p>PS Young Generation</p><p>Eden Space:</p><p>   capacity = 341966848 (326.125MB)</p><p>   used     = 298634744 (284.80028533935547MB)</p><p>   free     = 43332104 (41.32471466064453MB)</p><p>   87.32856583805457% used</p><p>From Space:</p><p>   capacity = 56885248 (54.25MB)</p><p>   used     = 56854136 (54.22032928466797MB)</p><p>   free     = 31112 (0.02967071533203125MB)</p><p>   99.94530743717598% used</p><p>To Space:</p><p>   capacity = 56885248 (54.25MB)</p><p>   used     = 0 (0.0MB)</p><p>   free     = 56885248 (54.25MB)</p><p>   0.0% used</p><p>PS Old Generation</p><p>   capacity = 910884864 (868.6875MB)</p><p>   used     = 71342136 (68.03716278076172MB)</p><p>   free     = 839542728 (800.6503372192383MB)</p><p>   7.832179325794572% used</p><p>PS Perm Generation</p><p>   capacity = 71303168 (68.0MB)</p><p>   used     = 71145280 (67.84942626953125MB)</p><p>   free     = 157888 (0.15057373046875MB)</p><p>   99.77856804342831% used</p><p>=========================================</p></div>
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