![]() If you run out of memory (which is what I gather from your vague paraphrase of the problem) then you either need to allocate more memory for the Java runtime, or modify your Java code to use less memory. Its called 'garbage collection' and it happens automatically. Sadly, Sun's VM interprets that "need" rather oddly and seems very eager to clear soft references when there's no need to do so, so I ended up having to put in a cute little trick to stop them getting unnecessarily wiped. No, Java already cleans up its own heap space. The size of the heap can vary, so many users restrict the Java heap size to 2-8 GB in order to. When the JVM is started, heap memory is created and any objects in the heap can be shared between threads as long as the application is running. If you aren't using all the files all the time, you may well benefit from using a cache based on SoftReferences (see here for a bit about reference objects - ) -properly implemented, this will allow you to keep some temporarily unused objects kicking about unless the GC "needs" the space. The Java heap is the area of memory used to store objects instantiated by applications running on the JVM. What you see from the Operating System perspective is the ‘process’ memory which ‘includes’ heap. Metadata is a data which is used to describe the data. Apart from that, this memory also stores the application metadata required by the JVM. can you resample any images smaller and throw away the larger ones?Ĥ. PermGen Memory: This is a special space in java heap which is separated from the main memory where all the static content is stored in this section. are you storing files in memory in their compressed (ie file format) form as well as their uncompressed (eg Java Image) formģ. do you really need all these things in memory at once?Ģ. jstat -gccapacity insert-pid-here will present information about memory pool generation and space capabilities. Once you have the pid, you can use jstat -gc insert-pid-here to find statistics of the behavior of the garbage collected heap. You should take a look at your application and ask yourself these questions:ġ. SongChanges section of Report running out of memory on large folder contaning all files 02.53.34:MDT:SongCache:findCoverImageByDataKey:SEVERE: Java heap space java. Each Java process has a pid, which you first need to find with the jps command. You can employ some tactics to economise on memory usage. if you need to start loading more or larger images/media files then you're just fighting fires if you up it to something which approaches the machine's available Ram and/or there are a number of other applications running, you'll find that it results in paging memory to disk - your application will still work but it will be dog slow and horrible to useģ. Upping the heap space will of course give you more memory to play with, but there are a few reasons why you might not want that to be your full solution:Ģ. 1.7K Training / Learning / Certification.165.3K Java EE (Java Enterprise Edition). ![]() 7.9K Oracle Database Express Edition (XE).3.8K Java and JavaScript in the Database.
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