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Re: Someone registers thousands of Object's and MethodRef's (was/is: gc times doubling)

From: Martin Egholm Nielsen <martin at egholm-nielsen dot dk>
To: java at gcc dot gnu dot org
Date: Thu, 30 Mar 2006 21:24:40 +0200
Subject: Re: Someone registers thousands of Object's and MethodRef's (was/is: gc times doubling)
References: <e0h9l2$j84$1@sea.gmane.org> <442C2D68.7060609@avtrex.com>

15179 of 21504 entries are non-null (points inside feasable heap-region)
6326 elements are of class "gnu.gcj.runtime.MethodRef"
8854 elements are of class "java.lang.Object"
Now, that's many MethodRef's!

The MethodRefs are used in the generation of stack traces. libgcj keeps a cache of them so that printing of stack traces is faster.

I think that each time each time an exception is thrown the cache can grow. Thus your array keeps getting bigger.

But 6000? That's really a huge number of methods, right! This array of 21504 is being registered after almost no time after application-start - we talk seconds - before anything has really happened...

// Martin

References:
- Someone registers thousands of Object's and MethodRef's (was/is: gc times doubling)
  - From: Martin Egholm Nielsen
- Re: Someone registers thousands of Object's and MethodRef's (was/is: gc times doubling)
  - From: David Daney

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