This basically means "out of heap space". It didn't technically run out of memory, but, is triggering garbage collection so much that the JVM figures it is critically low on free heap space.
You need to allocate more heap space. Try just 256MB with -Xm256m Have you looked at the documentation, there are some other settings you should be using with the JVM, like -server. Also you don't need to create a GenericItemSimilarity. That is going to consume a fair bit of memory as it is pre-computing and storing in memory all item-item similarities from a Pearson correlation. On Mon, Nov 9, 2009 at 2:28 AM, cumtyjh <[email protected]> wrote: > hi,all > > i got some error when generate product similarity according to rating file, > and there is about 250,000 recordes in rating file. > > it works when there is only 10,000 recordes in rating file. > > > do you have some suggestion? any help is appreciated > > thanks in advance. > > > following is code and log: > > > File file = new File(ratingFile); > logger.log(Level.INFO, "begin to load rating file..."); > FileDataModel model = new FileDataModel(file); > logger.log(Level.INFO, "load rating file OK."); > ItemSimilarity pearson = new LogLikelihoodSimilarity(model); > GenericItemSimilarity gif = new GenericItemSimilarity(pearson,model); > > > > INFO: load rating file OK. > - Reading file info... > - Processed 100000 lines > - Processed 200000 lines > Exception in thread "Thread-9" java.lang.OutOfMemoryError: GC overhead limit > exceeded > at org.apache.mahout.cf.taste.impl.common.FastSet.<init>(FastSet.java:74) > at > org.apache.mahout.cf.taste.impl.model.GenericDataModel.getNumUsersWithPreferenceFor(GenericDataModel.java:195) > at > org.apache.mahout.cf.taste.impl.model.file.FileDataModel.getNumUsersWithPreferenceFor(FileDataModel.java:314) > at > org.apache.mahout.cf.taste.impl.similarity.LogLikelihoodSimilarity.itemSimilarity(LogLikelihoodSimilarity.java:48) > at > org.apache.mahout.cf.taste.impl.similarity.GenericItemSimilarity$DataModelSimilaritiesIterator.next(GenericItemSimilarity.java:291) > at > org.apache.mahout.cf.taste.impl.similarity.GenericItemSimilarity$DataModelSimilaritiesIterator.next(GenericItemSimilarity.java:260) > at > org.apache.mahout.cf.taste.impl.similarity.GenericItemSimilarity.initSimilarityMaps(GenericItemSimilarity.java:128) > at > org.apache.mahout.cf.taste.impl.similarity.GenericItemSimilarity.<init>(GenericItemSimilarity.java:103) > > 2009-11-09 > > > > cumtyjh >
