Databases
StackOverflow2013
Postsdbo
POIs it memory leak?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POIs it memory leak?
    primarykey
    data
    text
    <p>I build a sample program demonstrate memory leak in java.</p> <pre><code>public class MemoryLeakTest { static int depth = 0; int number=0; MemoryLeakTest mobj; MemoryLeakTest(){ number = depth; if(depth &lt; 6500){ depth++; mobj = new MemoryLeakTest(); } } protected void finalize(){ System.out.println(number + " released."); } public static void main(String[] args) { try{ System.out.println(ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()); System.out.println("Free Memory in starting "+ Runtime.getRuntime().freeMemory()); MemoryLeakTest testObj = new MemoryLeakTest(); System.out.println("Free Memory in end "+ Runtime.getRuntime().freeMemory()); System.out.println(ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()); } catch(Exception exp){} finally{ System.out.println("Free Memory"+ Runtime.getRuntime().freeMemory()); System.out.println(ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()); } } } </code></pre> <p>I run it by changing value of N in <code>if(depth &lt; N)</code>. An here is the result;</p> <p><strong>when depth is 1000</strong></p> <p>init = 16777216(16384K) used = 288808(282K) committed = 16252928(15872K) max = 259522560(253440K) Free Memory in starting 15964120 Free Memory in end 15964120 init = 16777216(16384K) used = 288808(282K) committed = 16252928(15872K) max = 259522560(253440K) Free Memory 15964120 init = 16777216(16384K) used = 288808(282K) committed = 16252928(15872K) max = 259522560(253440K)</p> <p><strong>when depth is 1500</strong></p> <p>init = 16777216(16384K) used = 288808(282K) committed = 16252928(15872K) max = 259522560(253440K) Free Memory in starting 15964120 Free Memory in end 15964120 init = 16777216(16384K) used = 288808(282K) committed = 16252928(15872K) max = 259522560(253440K) Free Memory 15873528 init = 16777216(16384K) used = 379400(370K) committed = 16252928(15872K) max = 259522560(253440K)</p> <p><strong>when depth is 6000</strong></p> <p>init = 16777216(16384K) used = 288808(282K) committed = 16252928(15872K) max = 259522560(253440K) Free Memory in starting 15964120 Free Memory in end 15692784 init = 16777216(16384K) used = 560144(547K) committed = 16252928(15872K) max = 259522560(253440K) Free Memory 15692784 init = 16777216(16384K) used = 560144(547K) committed = 16252928(15872K) max = 259522560(253440K)</p> <p><strong>when depth is 6500 (Exception in thread "main" java.lang.StackOverflowError)</strong></p> <p>init = 16777216(16384K) used = 288808(282K) committed = 16252928(15872K) max = 259522560(253440K) Free Memory in starting 15964120 Free Memory in end 15676656 init = 16777216(16384K) used = 576272(562K) committed = 16252928(15872K) max = 259522560(253440K)</p> <p>My questions are;</p> <ol> <li>It is not calling finalize(). Is it memory leak?</li> <li>There is not change in free memory up to N=1000. But when N=1500 there is 2 different values for used memory at the end of the program ie 282K and 370K. Why does it so?</li> <li>When N=6500, JVM generates error. So why last 2 statements of try{} are executed.</li> </ol>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USAmit Kumar Gupta
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POIs it memory leak?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POIs it memory leak?
      1. USJasonw
      1. VTFavorite
    3. VO
      singulars
      1. POIs it memory leak?
      1. This table or related slice is empty.
      1. VTUpMod
    1. CO**Observation**, I found that JVM start releasing memory when I create huge amount of object like 1-2 lakhs. It means it is not memory leak but GC start releasing memory when it actually needs. Moreover, It is releasing object top on the heap first like it'll release object 9000 first then 8999 then 8998. interesting..
      singulars
      1. POIs it memory leak?
      1. USAmit Kumar Gupta
    2. COObservation 2: even after running GC, getHeapMemoryUsage giving higher used space.
      singulars
      1. POIs it memory leak?
      1. USAmit Kumar Gupta
    3. COYou can see http://stackoverflow.com/questions/6470651/creating-a-memory-leak-with-java : really useful for memory leaks in Java !
      singulars
      1. POIs it memory leak?
      1. USVal
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload