JVM metaspace is filled after minor garbage collection












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I have been looking into Java memory management and various sections in the heap memory like eden, s0, s1, old gen and metaspace. I was using VisualGC for tracking how memory is filled among different sections of heap. I noticed there is a sharp increase in the amount of memory occupied in the metaspace area after first garbage collection.



Here's an image of the VisualGC representation:



VisualGC_Monitoring



I would like to understand what gets added to metaspace after the first gc. I did research but couldn't get answers. Any help here?










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    1















    I have been looking into Java memory management and various sections in the heap memory like eden, s0, s1, old gen and metaspace. I was using VisualGC for tracking how memory is filled among different sections of heap. I noticed there is a sharp increase in the amount of memory occupied in the metaspace area after first garbage collection.



    Here's an image of the VisualGC representation:



    VisualGC_Monitoring



    I would like to understand what gets added to metaspace after the first gc. I did research but couldn't get answers. Any help here?










    share|improve this question



























      1












      1








      1








      I have been looking into Java memory management and various sections in the heap memory like eden, s0, s1, old gen and metaspace. I was using VisualGC for tracking how memory is filled among different sections of heap. I noticed there is a sharp increase in the amount of memory occupied in the metaspace area after first garbage collection.



      Here's an image of the VisualGC representation:



      VisualGC_Monitoring



      I would like to understand what gets added to metaspace after the first gc. I did research but couldn't get answers. Any help here?










      share|improve this question
















      I have been looking into Java memory management and various sections in the heap memory like eden, s0, s1, old gen and metaspace. I was using VisualGC for tracking how memory is filled among different sections of heap. I noticed there is a sharp increase in the amount of memory occupied in the metaspace area after first garbage collection.



      Here's an image of the VisualGC representation:



      VisualGC_Monitoring



      I would like to understand what gets added to metaspace after the first gc. I did research but couldn't get answers. Any help here?







      java garbage-collection heap-memory visualvm metaspace






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      share|improve this question













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      edited Nov 23 '18 at 18:24









      Slaw

      7,99831033




      7,99831033










      asked Nov 23 '18 at 17:36









      meesunmeesun

      213




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          Metaspace is not "full". According to the captions, the limit for metaspace is 1.008G but you have 8.602M in there (out of a 9.125M initial allocation). That is about 1% of the limit.



          Metaspace contains things related to classes; i.e. bytecodes, compiled native code, descriptors, statics. ~8M bytes is quite a modest amount of metaspace for a typical Java application that pulls in a few Java SE or 3rd-party library classes.




          I would like to understand what gets added to metaspace after the first gc.




          I suspect that it is just an accounting thing; i.e. the amount of memory used by metaspace only gets updated when the GC runs. If you notice, the 2 apparent changes in metaspace usage (after the start of recording) both coincide with a GC event.






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            Metaspace is not "full". According to the captions, the limit for metaspace is 1.008G but you have 8.602M in there (out of a 9.125M initial allocation). That is about 1% of the limit.



            Metaspace contains things related to classes; i.e. bytecodes, compiled native code, descriptors, statics. ~8M bytes is quite a modest amount of metaspace for a typical Java application that pulls in a few Java SE or 3rd-party library classes.




            I would like to understand what gets added to metaspace after the first gc.




            I suspect that it is just an accounting thing; i.e. the amount of memory used by metaspace only gets updated when the GC runs. If you notice, the 2 apparent changes in metaspace usage (after the start of recording) both coincide with a GC event.






            share|improve this answer




























              0














              Metaspace is not "full". According to the captions, the limit for metaspace is 1.008G but you have 8.602M in there (out of a 9.125M initial allocation). That is about 1% of the limit.



              Metaspace contains things related to classes; i.e. bytecodes, compiled native code, descriptors, statics. ~8M bytes is quite a modest amount of metaspace for a typical Java application that pulls in a few Java SE or 3rd-party library classes.




              I would like to understand what gets added to metaspace after the first gc.




              I suspect that it is just an accounting thing; i.e. the amount of memory used by metaspace only gets updated when the GC runs. If you notice, the 2 apparent changes in metaspace usage (after the start of recording) both coincide with a GC event.






              share|improve this answer


























                0












                0








                0







                Metaspace is not "full". According to the captions, the limit for metaspace is 1.008G but you have 8.602M in there (out of a 9.125M initial allocation). That is about 1% of the limit.



                Metaspace contains things related to classes; i.e. bytecodes, compiled native code, descriptors, statics. ~8M bytes is quite a modest amount of metaspace for a typical Java application that pulls in a few Java SE or 3rd-party library classes.




                I would like to understand what gets added to metaspace after the first gc.




                I suspect that it is just an accounting thing; i.e. the amount of memory used by metaspace only gets updated when the GC runs. If you notice, the 2 apparent changes in metaspace usage (after the start of recording) both coincide with a GC event.






                share|improve this answer













                Metaspace is not "full". According to the captions, the limit for metaspace is 1.008G but you have 8.602M in there (out of a 9.125M initial allocation). That is about 1% of the limit.



                Metaspace contains things related to classes; i.e. bytecodes, compiled native code, descriptors, statics. ~8M bytes is quite a modest amount of metaspace for a typical Java application that pulls in a few Java SE or 3rd-party library classes.




                I would like to understand what gets added to metaspace after the first gc.




                I suspect that it is just an accounting thing; i.e. the amount of memory used by metaspace only gets updated when the GC runs. If you notice, the 2 apparent changes in metaspace usage (after the start of recording) both coincide with a GC event.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 24 '18 at 1:20









                Stephen CStephen C

                518k70572928




                518k70572928
































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