Java.Io.Ioexception: Map Failed As Well As Java.Lang.Outofmemoryerror: Map Failed

While working amongst memory mapped file, y'all may larn java.io.IOException: Map failed error, which is mainly caused past times Caused by: java.lang.OutOfMemoryError: Map failed mistake every bit shown below. This mistake ordinarily comes field mapping a large file inwards retentiveness e.g. trying to map a file greater than 1 or 2GB

java.io.IOException: Map failed
 at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:888)
Caused by: java.lang.OutOfMemoryError: Map failed
 at sun.nio.ch.FileChannelImpl.map0(Native Method)
 at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:885)
 ... half-dozen more


How to Solve java.io.IOException: Map failed

JVM option to enable large straight buffers :


-d64
This JVM flag teach virtual machine to run on 64-bit mode. Since 64-bit installation on Solaris together with may travel on other UNIX systems comes amongst 32-bit JVM every bit well, which may travel efficient for small-scale programs, due to small-scale size of OOPS pointer every bit discusses on why role -XX:UseCompressedOOPS flag inwards 64-bit JVM. By providing this choice to your JVM y'all brand certain that it's running on 64-bit mode, allowing it to map to a greater extent than memory.


-XX:MaxDirectMemorySize
This choice is non on official listing of JVM flags simply yet a proficient choice to try. It allows y'all configure retentiveness used past times straight buffers.

 One to a greater extent than option, y'all tin endeavor is -XX:+UseLargePages.

 For example, if your programme is using 6GB of retentiveness mapped file, y'all may desire to pass

 java -d64 -XX:MaxDirectMemorySize=6g -XX:+UseLargePages BigApp



That's all on how to solve java.io.IOException: Map failed together with java.lang.OutOfMemoryError: Map failed. You tin role whatsoever of these options or combination of them to come across what plant for you. Make certain y'all role 64-bit JVM if y'all are mapping large files inwards memory. Remember though both mistake are different, i is IOException together with other is OutOfMemoryError, elbow grease is some same, departure is IOException comes field using that file together with OutOfMemoryError comes field mapping that file inwards memory.

Further Learning
Java Memory Management
Understanding the Java Virtual Machine: Memory Management
Understanding together with Solving Java Memory Problems

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