heap memory consumption by CrossSiteIframeLinker

Hello,

I'm meeting a problem during gwt compilation. My application is quite big.

[INFO]  
Permutation 8 (strong name BA14D66EEC73FB44262423A88ADFC40E) has an initial download size of 19984060 and total script size of 37457074

[INFO]   Invoking Linker RPC policy file manifest

[INFO]    Invoking Linker Cross-Site-Iframe

[INFO]       [ERROR] Failed to link

[INFO] java.lang.OutOfMemoryError: Java heap space

[INFO]  at java.util.Arrays.copyOf(Arrays.java:2367)

[INFO]  at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:130)

[INFO]  at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:114)

[INFO]  at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:415)

[INFO]  at java.lang.StringBuilder.append(StringBuilder.java:132)

[INFO]  at com.google.gwt.core.linker.CrossSiteIframeLinker.wrapPrimaryFragment(CrossSiteIframeLinker.java:700)

[INFO]  at com.google.gwt.core.ext.linker.impl.SelectionScriptLinker.generatePrimaryFragmentString(SelectionScriptLinker.java:406)

[INFO]  at com.google.gwt.core.ext.linker.impl.SelectionScriptLinker.generatePrimaryFragment(SelectionScriptLinker.java:377)

[INFO]  at com.google.gwt.core.ext.linker.impl.SelectionScriptLinker.doEmitCompilation(SelectionScriptLinker.java:254)

[INFO]  at com.google.gwt.core.ext.linker.impl.SelectionScriptLinker.link(SelectionScriptLinker.java:196)

[INFO]  at com.google.gwt.core.ext.linker.impl.StandardLinkerContext.invokeLinkForOnePermutation(StandardLinkerContext.java:381)

[INFO]  at com.google.gwt.dev.Link.finishPermutation(Link.java:489)

[INFO]  at com.google.gwt.dev.Link.doSimulatedShardingLink(Link.java:450)

[INFO]  at com.google.gwt.dev.Link.link(Link.java:182)

[INFO]  at com.google.gwt.dev.Compiler.run(Compiler.java:246)

[INFO]  at com.google.gwt.dev.Compiler.run(Compiler.java:158)

[INFO]  at com.google.gwt.dev.Compiler$1.run(Compiler.java:120)

[INFO]  at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)

[INFO]  at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)

[INFO]  at com.google.gwt.dev.Compiler.main(Compiler.java:127)

[INFO]  [ERROR] Out of memory; to increase the amount of memory, use the -Xmx flag at startup (java -Xmx128M ...)

[INFO] Shutting down PersistentUnitCache thread

The problem appears while appending String using a StringBuilder which size is not initialized. As permutations size is huge, I guess it would work better (needing less heap) if the initial StringBuilder size was initialized with a big value (in code or through a parameter). 

AbstractStringBuilder : 

void expandCapacity(int minimumCapacity) {

111

         int newCapacity = (value.length + 1) * 2;

112

         if (newCapacity < 0) {

113

             newCapacity = Integer.MAX_VALUE;

114

         } else if (minimumCapacity > newCapacity) {

115

             newCapacity = minimumCapacity;

116

         }

117

         value = Arrays.copyOf(value, newCapacity); <-- value exists twice here, doubling memory consumption.

118

     }

If permutation size is known before entering in CrossSiteIframeLinker, I think StringBuilder should be initialized correctly. I don't even mention the number of array copies needed to allocate several Mb by starting from 16 bytes to final size.

What do you think of it ?

Thank you.

dominique

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