在Java JNA调用的dll中分配内存错误

Question

I try to integrate DLL using JNA in Java. DLL allocates a lot of memory (~600MB). Library is compiled to 32 bit version, so I need to use 32 bit JVM.

I've got fatal error from JVM

 EXCEPTION_UNCAUGHT_CXX_EXCEPTION (0xe06d7363) at pc=0x772bd928, pid=7976, tid=2444

with detailed information

siginfo: ExceptionCode=0xe06d7363, ExceptionInformation=0x19930520 0x02dce184 0x6a3853d8 

and stack

Stack: [0x023d0000,0x02dd0000],  sp=0x02dce0d0,  free space=10232k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C  [KERNELBASE.dll+0xbd928]
C  [MSVCR120D.dll+0x120b86]
C  [MSVCR120D.dll+0x12c2a1]
C  [face_analysis_libD.dll+0x1157dc]  operator new[]+0xc
C  [face_analysis_libD.dll+0xea995]  Mat<float>::setSize+0xa5
C  [face_analysis_libD.dll+0xe904e]  Recognizer::initialize+0x9e
C  [face_analysis_libD.dll+0xb2bf9]  Analyser::initializeAnalyser+0x1c9

Application is started with params

-Xmx1300m -Xms1300m -Xss10m -XX:MaxDirectMemorySize=3g -XX:+PrintHeapAtGC

Probably the problem is with some memory limits on JVM (library works great with C#). Maybe someone has similar problem and can help mi find solution how to run this library in 32 bit JVM.

Answer 1

32bit applications are generally restricted to 2GB of virtual address space. Assuming you're on a 64bit windows this can be extended to 4GB if the binary has been built with the largeaddressaware flag. I think 32bit java.exe has not, although I haven't tested it myself.

So if the JVM is already eating 1.3G for the heap, additional memory for thread stacks and other non-heap data structures then there is fairly little room left for the dll to make allocations. If it then needs to make a large contiguous allocation this is probably going to fail and throw a C++ exception.

Your options likely are:

• reduce heap size
• get a 64bit version of that library instead
• see if marking the binary as largeaddressaware helps, there are tools to do that