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Thread: Malloc fails after 3.8 GB when jvm is loaded on SunOS 11

  1. #1
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    Default Malloc fails after 3.8 GB when jvm is loaded on SunOS 11

    All,

    I have a very simple c++ program that dynamically loads the jvm and in a loop tries to allocate memory in chunks of 512K. The malloc fails after about 3.8 GB is consumed. I don't use the jvm in any way other than just loading it. If I specify a java max heap size of 4096 MB I can allocate up 29 GB and then the malloc fails. If I subsequently increase the max heap size to 32GB then I can allocate more than 100GB.

    What is interesting is that this happens only on SunOS 11. Also it happens with java 1.6.0_26 and java 1.7 but not with java 1.6.0_22. If I don't load the jvm everything runs fine. This simple program runs without issues on SunOS 10, linux and windows with java 1.7.

    I have used truss with this program and I get the following output

    /1: nanosleep(0xFFFFFD7FFFDFF600, 0x00000000) = 0
    /1: brk(0xEAAEC000) = 0
    /1: nanosleep(0xFFFFFD7FFFDFF600, 0x00000000) = 0
    /1: brk(0xEABED000) = 0
    /1: nanosleep(0xFFFFFD7FFFDFF600, 0x00000000) = 0
    /1: brk(0xEACEE000) Err#12 ENOMEM
    This machine has 256GB of memory. I have been scratching my head for a while now and any help will be greatly appreciated.

    Pauli

    Find below the full code for your reference


    #define MAX_MEMORY 10*1024*1024
    #define ALLOC_SIZE 512
    #define MAX_JAVA_HEAP "-Xmx256m"
    #define REPORTING_INTERVAL 1000
    #define USE_JAVA_VM 1

    #ifdef _WIN32
    #include <winsock2.h>
    #include "win_dlfcn.h"
    #else
    #include <dlfcn.h>
    #endif


    #include <jni.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <string>
    #include <iostream>
    #include <list>


    using namespace std;
    //On Windows the JNI_CreateJavaVM function is called with __stdcall convention
    #ifdef _WIN32
    typedef jint (__stdcall *jniCreateJavaVM_t) (JavaVM **, void **, JavaVMInitArgs *);
    typedef jint (__stdcall *jniGetCreatedJavaVMs_t) (JavaVM **, jsize, jsize *);
    #else
    typedef jint (*jniCreateJavaVM_t) (JavaVM **, void **, JavaVMInitArgs *);
    typedef jint (*jniGetCreatedJavaVMs_t) (JavaVM **, jsize, jsize *);
    #endif


    static void *s_jvmLibrary = NULL;
    static JavaVMInitArgs s_vmArgs = {0};
    static JavaVMOption *s_vmOptions = NULL;

    string maxHeapSize = "-XmxMAX_JAVA_HEAP";

    void * GetJavaVMLibrary()
    {
    std::string jvmLibrary;
    const char *pjvmLibrary = getenv("JAVA_HOME");

    if (!pjvmLibrary || !*pjvmLibrary)
    {
    std::cerr << "JAVA_HOME has not been set" << std::endl;
    exit(1);
    }
    jvmLibrary = std::string(pjvmLibrary) + "/";

    #if defined(WIN64)
    jvmLibrary.append("bin/server/jvm.dll");
    #elif defined(WIN32)
    jvmLibrary.append("bin/client/jvm.dll");
    #elif defined(__sparc__) && defined(__sun__)
    jvmLibrary.append("lib/sparcv9/server/libjvm.so");
    #elif defined(__x86_64__) && defined(__sun__)
    jvmLibrary.append("lib/amd64/server/libjvm.so");
    #elif defined(__i386__) && defined(__linux__)
    jvmLibrary.append("lib/i386/server/libjvm.so");
    #elif defined(__x86_64__) && defined(__linux__)
    jvmLibrary.append("lib/amd64/server/libjvm.so");
    #else
    jvmLibrary = "./libjvm.so";
    #endif
    std::cout << "jvmlibrary is " << jvmLibrary << std::endl;

    #ifndef RTLD_GLOBAL
    #define RTLD_GLOBAL 0
    #endif
    void * s_jvmLibrary = dlopen(jvmLibrary.c_str(), RTLD_LAZY | RTLD_GLOBAL);

    if( !s_jvmLibrary )
    {
    char * err = dlerror();
    string error = (err == NULL) ? "could not open Java VM shared library" : err;
    std::cerr << error << std::endl;
    exit(1);
    }
    return s_jvmLibrary;
    }

    JavaVM * CreateJavaVM()
    {
    JNIEnv *env = NULL;
    JavaVM *jvm = NULL;
    std::list<std::string> vmOptions;

    void *libraryHandle = GetJavaVMLibrary();
    jniCreateJavaVM_t createVMFunction = (jniCreateJavaVM_t)dlsym(libraryHandle, "JNI_CreateJavaVM");

    if( !createVMFunction )
    {
    std::cerr << "could not find Java VM library function " << std::endl;
    exit(1);
    }


    //Set the Java Max Heap Option
    int noOfOptions = 1;
    s_vmOptions = (JavaVMOption *)malloc(noOfOptions * sizeof(JavaVMOption));
    s_vmOptions[0].optionString = strdup(maxHeapSize.c_str());

    s_vmArgs.version = JNI_VERSION_1_6;
    s_vmArgs.options = s_vmOptions;
    s_vmArgs.nOptions = noOfOptions;
    s_vmArgs.ignoreUnrecognized = JNI_TRUE;

    // Create the Java VM
    int ret = createVMFunction(&jvm, (void**)&env, &s_vmArgs);

    if( ret != 0 )
    {
    std::cerr << "Could not create jvm" << endl;
    exit(1);
    }

    return jvm;
    }

    int main(int argc, char **argv)
    {
    int createJvm = USE_JAVA_VM;
    long mSize = ALLOC_SIZE;
    long maxSize = MAX_MEMORY;


    if(argc > 1){
    maxSize = (atol(argv[1]) * 1024);
    cout << "maxSize is " << maxSize << endl;
    }
    if(argc > 2){
    maxHeapSize = string("-Xmx").append(argv[2]);
    }
    if(argc > 3){
    createJvm = atoi(argv[3]);
    }

    if (createJvm)
    {
    JavaVM *vm = CreateJavaVM();

    if (vm != NULL)
    {
    printf("Sucessfully created Java VM\n");
    }
    else
    {
    printf("Failed to create Java VM\n");
    return 1;
    }
    }

    long memUsed = 0;
    long count = 0;

    printf("beginning mallocs\n");

    std::list<void *> memory;
    while (memUsed < maxSize)
    {
    void *ptr = malloc(mSize*1024);
    memory.push_back(ptr);

    if (ptr == NULL)
    {
    printf("malloc failed, count=%ld, size=%ld k\n", count, memUsed);
    return 1;
    }

    memset(ptr, 0, mSize*1024);

    memUsed += mSize;
    count++;
    if (!(count % REPORTING_INTERVAL))
    {
    printf("malloc count=%ld, size=%ld m\n", count, memUsed/1024);
    }
    }

    printf("finished mallocs\n");

    return 0;
    }
    Last edited by pgandhi; July 25th, 2012 at 05:54 PM. Reason: Adding code


  2. #2
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    Default Re: Malloc fails after 3.8 GB when jvm is loaded on SunOS 11

    Wait, does the computer have 256GB of RAM, or 256GB of harddrive space? I would be shocked if it was the former. To my knowledge, runtime data size is limited by your computer's RAM, Stack Size, Heap Size, ect.
    Last edited by aussiemcgr; July 25th, 2012 at 03:08 PM.
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  3. #3
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    Default Re: Malloc fails after 3.8 GB when jvm is loaded on SunOS 11

    Quote Originally Posted by aussiemcgr View Post
    Wait, does the computer have 256GB of RAM, or 256GB of harddrive space? I would be shocked if it was the former. To my knowledge, runtime data size is limited by your computer's RAM, Stack Size, Heap Size, ect.
    It is 256 GB of memory. Here is the snippet of top output

    load averages: 4.50, 4.72, 3.64; up 2+16:09:30 15:43:28
    106 processes: 102 sleeping, 4 on cpu
    CPU states: 83.9% idle, 8.9% user, 7.2% kernel, 0.0% iowait, 0.0% swap
    Kernel: 433112 ctxsw, 35 trap, 18628 intr, 53319 syscall, 10 flt
    Memory: 256G phys mem, 204G free mem, 75G total swap, 75G free swap

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