memory - Java Runtime.getRuntime().freeMemory() issues -

i searched , saw threads, none addressed specific issue encountering.

i trying monitor memory usage using runtime.getruntime().freememory(), runtime.getruntime().maxmemory(), , runtime.getruntime().totalmemory().

on 1 run, says there 2245273792 free bytes right before declaring array, program runs out of memory , crashes when tries declare array 1104674816 bytes:

    free memory (bytes): 2245273792      maximum memory (bytes): 6710886400     total memory available jvm (bytes): 5606211584     openjdk 64-bit server vm warning: info: os::commit_memory(0x0000000728280000, 1104674816, 0) failed; error='cannot allocate memory' (errno=12)       there insufficient memory java runtime environment continue.      native memory allocation (malloc) failed allocate 1104674816 bytes committing reserved memory.      error report file more information saved as: 

edit: how possible run out of memory when allocating less half of amount free? running out of memory bad program; there way can guarantee don't allocate more available? calling system.gc() first make amount of free/available memory more reliable? can throw sort of exception if program run out of memory, instead of having crash?

the command crashed on was: float[][] = new float[num_seq_total_p1][num_seq_total_p2]; num_seq_total_p1 = 16009, num_seq_total_p2 = 16937.

edit: portion of error log pasted below requested commenter.

 there insufficient memory java runtime environment continue.  native memory allocation (malloc) failed allocate 1104674816 bytes committing reserved memory.  possible reasons:    system out of physical ram or swap space    in 32 bit mode, process size limit hit  possible solutions:    reduce memory load on system    increase physical memory or swap space    check if swap backing store full    use 64 bit java on 64 bit os    decrease java heap size (-xmx/-xms)    decrease number of java threads    decrease java thread stack sizes (-xss)    set larger code cache -xx:reservedcodecachesize=  output file may truncated or incomplete.    out of memory error (os_linux.cpp:2769), pid=14802, tid=140058464728832   jre version: openjdk runtime environment (7.0_55-b14) (build 1.7.0_55-b14)  java vm: openjdk 64-bit server vm (24.51-b03 mixed mode linux-amd64 compressed oops)  failed write core dump. core dumps have been disabled. enable core dumping, try "ulimit -c unlimited" before starting java again   ---------------  t h r e d  ---------------  current thread (0x00007f61f0071000):  vmthread [stack: 0x00007f61e6f9b000,0x00007f61e709c000] [id=14806]  stack: [0x00007f61e6f9b000,0x00007f61e709c000],  sp=0x00007f61e709a470,  free space=1021k native frames: (j=compiled java code, j=interpreted, vv=vm code, c=native code) v  [libjvm.so+0x917b35]  vmerror::report_and_die()+0x175 v  [libjvm.so+0x468144]  report_vm_out_of_memory(char const*, int, unsigned long, char const*)+0x74 v  [libjvm.so+0x79a81b]  os::pd_commit_memory(char*, unsigned long, unsigned long, bool)+0x20b v  [libjvm.so+0x7950df]  os::commit_memory(char*, unsigned long, unsigned long, bool)+0x1f v  [libjvm.so+0x8053cb]  psvirtualspace::expand_by(unsigned long)+0x5b v  [libjvm.so+0x7f519b]  psoldgen::expand_by(unsigned long) [clone .part.80]+0x1b v  [libjvm.so+0x7f535b]  psoldgen::expand(unsigned long) [clone .part.81]+0xdb v  [libjvm.so+0x7f6288]  psoldgen::resize(unsigned long)+0x188 v  [libjvm.so+0x7fd2e3]  psparallelcompact::invoke_no_policy(bool)+0x9c3 v  [libjvm.so+0x80350d]  psscavenge::invoke()+0x17d v  [libjvm.so+0x7b9b33]  parallelscavengeheap::failed_mem_allocate(unsigned long)+0x63 v  [libjvm.so+0x919544]  vm_parallelgcfailedallocation::doit()+0x84 v  [libjvm.so+0x91d9e7]  vm_operation::evaluate()+0x47 v  [libjvm.so+0x91c3b8]  vmthread::evaluate_operation(vm_operation*)+0x318 v  [libjvm.so+0x91c85a]  vmthread::loop()+0x25a v  [libjvm.so+0x91cc62]  vmthread::run()+0x72 v  [libjvm.so+0x7974e2]  java_start(thread*)+0xf2  vm_operation (0x00007f61f8b6b2e0): parallelgcfailedallocation, mode: safepoint, requested thread 0x00007f61f000a000   ---------------  p r o c e s s  ---------------  java threads: ( => current thread )   0x00007f61f00a1800 javathread "service thread" daemon [_thread_blocked, id=14812, stack(0x00007f61e680c000,0x00007f61e690d000)]   0x00007f61f009f000 javathread "c2 compilerthread1" daemon [_thread_blocked, id=14811, stack(0x00007f61e690d000,0x00007f61e6a0e000)]   0x00007f61f009c000 javathread "c2 compilerthread0" daemon [_thread_blocked, id=14810, stack(0x00007f61e6a0e000,0x00007f61e6b0f000)]   0x00007f61f009a000 javathread "signal dispatcher" daemon [_thread_blocked, id=14809, stack(0x00007f61e6b0f000,0x00007f61e6c10000)]   0x00007f61f0077800 javathread "finalizer" daemon [_thread_blocked, id=14808, stack(0x00007f61e6d99000,0x00007f61e6e9a000)]   0x00007f61f0075800 javathread "reference handler" daemon [_thread_blocked, id=14807, stack(0x00007f61e6e9a000,0x00007f61e6f9b000)]   0x00007f61f000a000 javathread "main" [_thread_blocked, id=14803, stack(0x00007f61f8a6c000,0x00007f61f8b6d000)]  other threads: =>0x00007f61f0071000 vmthread [stack: 0x00007f61e6f9b000,0x00007f61e709c000] [id=14806]   0x00007f61f00ac000 watcherthread [stack: 0x00007f61e670b000,0x00007f61e680c000] [id=14813]  vm state:at safepoint (normal execution)  vm mutex/monitor owned thread:  ([mutex/lock_event]) [0x00007f61f0005ea0] expandheap_lock - owner thread: 0x00007f61f0071000 [0x00007f61f0006520] threads_lock - owner thread: 0x00007f61f0071000 [0x00007f61f0006a20] heap_lock - owner thread: 0x00007f61f000a000  heap  psyounggen      total 1638400k, used 205885k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 0% used [0x000000076a000000,0x000000076a000000,0x000000079c000000)   space 819200k, 25% used [0x00000007ce000000,0x00000007da90f408,0x0000000800000000)     space 819200k, 0% used [0x000000079c000000,0x000000079c000000,0x00000007ce000000)  paroldgen       total 3836416k, used 3836085k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 99% used [0x000000063e000000,0x000000072822d6b8,0x0000000728280000)  pspermgen       total 21504k, used 5549k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b518,0x0000000634f00000)  card table byte_map: [0x00007f61f487d000,0x00007f61f56e1000] byte_map_base: 0x00007f61f16e0000  polling page: 0x00007f61f8b7d000  code cache  [0x00007f61ed000000, 0x00007f61ed270000, 0x00007f61f0000000)  total_blobs=653 nmethods=373 adapters=234 free_code_cache=46884kb largest_free_block=47925312  compilation events (10 events): event: 697.652 thread 0x00007f61f009c000  394             playingagent.tartanian7.playeraction::access$0 (5 bytes) event: 697.652 thread 0x00007f61f009c000 nmethod 394 0x00007f61ed1f0150 code [0x00007f61ed1f0280, 0x00007f61ed1f02d8] event: 729.745 thread 0x00007f61f009f000  395             java.nio.buffer::remaining (10 bytes) event: 729.745 thread 0x00007f61f009f000 nmethod 395 0x00007f61ed1eff50 code [0x00007f61ed1f0080, 0x00007f61ed1f00d8] event: 921.702 thread 0x00007f61f009c000  396             playingagent.riversolver.doylesgameriver2::getriverstrategy (451 bytes) event: 921.710 thread 0x00007f61f009f000  397             playingagent.tartanian7.pokerutils::countrounddelimiters (42 bytes) event: 921.714 thread 0x00007f61f009f000 nmethod 397 0x00007f61ed1f8350 code [0x00007f61ed1f84a0, 0x00007f61ed1f86b8] event: 921.720 thread 0x00007f61f009f000  398             java.lang.string::startswith (7 bytes) event: 921.724 thread 0x00007f61f009f000 nmethod 398 0x00007f61ed108010 code [0x00007f61ed108160, 0x00007f61ed108338] event: 922.063 thread 0x00007f61f009c000 nmethod 396 0x00007f61ed23db90 code [0x00007f61ed23e6e0, 0x00007f61ed244d78]  gc heap history (10 events): event: 922.966 gc heap after heap after gc invocations=137 (full 23):  psyounggen      total 1638400k, used 280234k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 0% used [0x000000076a000000,0x000000076a000000,0x000000079c000000)   space 819200k, 34% used [0x00000007ce000000,0x00000007df1aa930,0x0000000800000000)     space 819200k, 0% used [0x000000079c000000,0x000000079c000000,0x00000007ce000000)  paroldgen       total 3836416k, used 2558981k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 66% used [0x000000063e000000,0x00000006da301608,0x0000000728280000)  pspermgen       total 21504k, used 5548k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b068,0x0000000634f00000) } event: 941.023 gc heap before {heap before gc invocations=138 (full 23):  psyounggen      total 1638400k, used 1099434k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 100% used [0x000000076a000000,0x000000079c000000,0x000000079c000000)   space 819200k, 34% used [0x00000007ce000000,0x00000007df1aa930,0x0000000800000000)     space 819200k, 0% used [0x000000079c000000,0x000000079c000000,0x00000007ce000000)  paroldgen       total 3836416k, used 2558981k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 66% used [0x000000063e000000,0x00000006da301608,0x0000000728280000)  pspermgen       total 21504k, used 5548k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b258,0x0000000634f00000) event: 941.125 gc heap after heap after gc invocations=138 (full 23):  psyounggen      total 1638400k, used 463312k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 0% used [0x000000076a000000,0x000000076a000000,0x000000079c000000)   space 819200k, 56% used [0x000000079c000000,0x00000007b8474158,0x00000007ce000000)     space 819200k, 0% used [0x00000007ce000000,0x00000007ce000000,0x0000000800000000)  paroldgen       total 3836416k, used 2559185k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 66% used [0x000000063e000000,0x00000006da334680,0x0000000728280000)  pspermgen       total 21504k, used 5548k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b258,0x0000000634f00000) } event: 971.960 gc heap before {heap before gc invocations=139 (full 23):  psyounggen      total 1638400k, used 1282512k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 100% used [0x000000076a000000,0x000000079c000000,0x000000079c000000)   space 819200k, 56% used [0x000000079c000000,0x00000007b8474158,0x00000007ce000000)     space 819200k, 0% used [0x00000007ce000000,0x00000007ce000000,0x0000000800000000)  paroldgen       total 3836416k, used 2559185k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 66% used [0x000000063e000000,0x00000006da334680,0x0000000728280000)  pspermgen       total 21504k, used 5549k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b518,0x0000000634f00000) event: 971.996 gc heap after heap after gc invocations=139 (full 23):  psyounggen      total 1638400k, used 130974k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 0% used [0x000000076a000000,0x000000076a000000,0x000000079c000000)   space 819200k, 15% used [0x00000007ce000000,0x00000007d5fe7b78,0x0000000800000000)     space 819200k, 0% used [0x000000079c000000,0x000000079c000000,0x00000007ce000000)  paroldgen       total 3836416k, used 2559301k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 66% used [0x000000063e000000,0x00000006da351710,0x0000000728280000)  pspermgen       total 21504k, used 5549k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b518,0x0000000634f00000) } event: 972.098 gc heap before {heap before gc invocations=140 (full 23):  psyounggen      total 1638400k, used 950174k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 100% used [0x000000076a000000,0x000000079c000000,0x000000079c000000)   space 819200k, 15% used [0x00000007ce000000,0x00000007d5fe7b78,0x0000000800000000)     space 819200k, 0% used [0x000000079c000000,0x000000079c000000,0x00000007ce000000)  paroldgen       total 3836416k, used 2559301k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 66% used [0x000000063e000000,0x00000006da351710,0x0000000728280000)  pspermgen       total 21504k, used 5549k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b518,0x0000000634f00000) event: 972.296 gc heap after heap after gc invocations=140 (full 23):  psyounggen      total 1638400k, used 817538k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 0% used [0x000000076a000000,0x000000076a000000,0x000000079c000000)   space 819200k, 99% used [0x000000079c000000,0x00000007cde60b18,0x00000007ce000000)     space 819200k, 0% used [0x00000007ce000000,0x00000007ce000000,0x0000000800000000)  paroldgen       total 3836416k, used 2689286k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 70% used [0x000000063e000000,0x00000006e2241b50,0x0000000728280000)  pspermgen       total 21504k, used 5549k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b518,0x0000000634f00000) } event: 972.397 gc heap before {heap before gc invocations=141 (full 23):  psyounggen      total 1638400k, used 1636738k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 100% used [0x000000076a000000,0x000000079c000000,0x000000079c000000)   space 819200k, 99% used [0x000000079c000000,0x00000007cde60b18,0x00000007ce000000)     space 819200k, 0% used [0x00000007ce000000,0x00000007ce000000,0x0000000800000000)  paroldgen       total 3836416k, used 2689286k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 70% used [0x000000063e000000,0x00000006e2241b50,0x0000000728280000)  pspermgen       total 21504k, used 5549k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b518,0x0000000634f00000) event: 972.791 gc heap after heap after gc invocations=141 (full 23):  psyounggen      total 1638400k, used 817782k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 0% used [0x000000076a000000,0x000000076a000000,0x000000079c000000)   space 819200k, 99% used [0x00000007ce000000,0x00000007ffe9d998,0x0000000800000000)     space 819200k, 0% used [0x000000079c000000,0x000000079c000000,0x00000007ce000000)  paroldgen       total 3836416k, used 3506825k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 91% used [0x000000063e000000,0x00000007140a2668,0x0000000728280000)  pspermgen       total 21504k, used 5549k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b518,0x0000000634f00000) } event: 972.791 gc heap before {heap before gc invocations=142 (full 24):  psyounggen      total 1638400k, used 817782k [0x000000076a000000, 0x0000000800000000, 0x0000000800000000)   eden space 819200k, 0% used [0x000000076a000000,0x000000076a000000,0x000000079c000000)   space 819200k, 99% used [0x00000007ce000000,0x00000007ffe9d998,0x0000000800000000)     space 819200k, 0% used [0x000000079c000000,0x000000079c000000,0x00000007ce000000)  paroldgen       total 3836416k, used 3506825k [0x000000063e000000, 0x0000000728280000, 0x000000076a000000)   object space 3836416k, 91% used [0x000000063e000000,0x00000007140a2668,0x0000000728280000)  pspermgen       total 21504k, used 5549k [0x0000000633a00000, 0x0000000634f00000, 0x000000063e000000)   object space 21504k, 25% used [0x0000000633a00000,0x0000000633f6b518,0x0000000634f00000)  deoptimization events (10 events): event: 388.757 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed200cd4 method=java.util.comparabletimsort.mergehi(iiii)v @ 234 event: 425.767 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed226240 method=java.util.comparabletimsort.mergehi(iiii)v @ 642 event: 425.768 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed226240 method=java.util.comparabletimsort.mergehi(iiii)v @ 642 event: 451.013 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed229d20 method=java.util.comparabletimsort.mergehi(iiii)v @ 404 event: 451.013 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed229d20 method=java.util.comparabletimsort.mergehi(iiii)v @ 404 event: 518.661 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed22c5c8 method=java.util.comparabletimsort.mergehi(iiii)v @ 509 event: 518.661 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed22c5c8 method=java.util.comparabletimsort.mergehi(iiii)v @ 509 event: 576.223 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed22399c method=java.util.comparabletimsort.mergelo(iiii)v @ 129 event: 626.762 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed22399c method=java.util.comparabletimsort.mergelo(iiii)v @ 129 event: 805.388 thread 0x00007f61f000a000 uncommon trap: reason=array_check action=maybe_recompile pc=0x00007f61ed232884 method=java.util.comparabletimsort.mergehi(iiii)v @ 160  internal exceptions (10 events): event: 95.779 thread 0x00007f61f000a000 threw 0x000000076e72f270 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244 event: 95.780 thread 0x00007f61f000a000 threw 0x000000076e732680 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244 event: 95.866 thread 0x00007f61f000a000 threw 0x000000076ea384b0 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244 event: 118.330 thread 0x00007f61f000a000 threw 0x0000000770f9b6f0 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244 event: 118.332 thread 0x00007f61f000a000 threw 0x0000000770fba0d8 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244 event: 118.528 thread 0x00007f61f000a000 threw 0x00000007713a1fc0 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244 event: 118.529 thread 0x00007f61f000a000 threw 0x00000007713a9628 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244 event: 118.533 thread 0x00007f61f000a000 threw 0x00000007713bea90 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244 event: 118.545 thread 0x00007f61f000a000 threw 0x00000007713e8238 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244 event: 118.546 thread 0x00007f61f000a000 threw 0x00000007713eb0f8 @ /build/buildd/openjdk-7-7u55-2.4.7/build/openjdk/hotspot/src/share/vm/prims/jvm.cpp:1244  events (10 events): event: 972.069 executing vm operation: revokebias done event: 972.069 executing vm operation: revokebias event: 972.069 executing vm operation: revokebias done event: 972.069 executing vm operation: revokebias event: 972.069 executing vm operation: revokebias done event: 972.069 executing vm operation: revokebias event: 972.069 executing vm operation: revokebias done event: 972.069 executing vm operation: revokebias event: 972.296 executing vm operation: revokebias done event: 972.296 executing vm operation: revokebias  dynamic libraries:[omitted]   vm arguments: jvm_args: -xmx7200m  java_command: [omitted] launcher type: sun_standard  environment variables: [omitted]  signal handlers: sigsegv: [libjvm.so+0x918620], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 sigbus: [libjvm.so+0x918620], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 sigfpe: [libjvm.so+0x795e30], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 sigpipe: [libjvm.so+0x795e30], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 sigxfsz: [libjvm.so+0x795e30], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 sigill: [libjvm.so+0x795e30], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 sigusr1: sig_dfl, sa_mask[0]=0x00000000, sa_flags=0x00000000 sigusr2: [libjvm.so+0x795cd0], sa_mask[0]=0x00000000, sa_flags=0x10000004 sighup: [libjvm.so+0x795eb0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 sigint: [libjvm.so+0x795eb0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 sigterm: [libjvm.so+0x795eb0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 sigquit: [libjvm.so+0x795eb0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004   ---------------  s y s t e m  ---------------  os:ubuntu 14.04 (trusty) uname:linux 3.13.0-24-generic #46-ubuntu smp thu apr 10 19:11:08 utc 2014 x86_64 libc:glibc 2.19 nptl 2.19  rlimit: stack 8192k, core 0k, nproc 59937, nofile 4096, infinity load average:1.80 1.67 1.50  /proc/meminfo: memtotal:        7693824 kb memfree:          634168 kb buffers:           12600 kb cached:           290332 kb swapcached:            0 kb active:          6799656 kb inactive:         151160 kb active(anon):    6647936 kb inactive(anon):      200 kb active(file):     151720 kb inactive(file):   150960 kb unevictable:           0 kb mlocked:               0 kb swaptotal:             0 kb swapfree:              0 kb dirty:                36 kb writeback:             0 kb anonpages:       6647924 kb mapped:            18848 kb shmem:               236 kb slab:              41348 kb sreclaimable:      32536 kb sunreclaim:         8812 kb kernelstack:         848 kb pagetables:        17104 kb nfs_unstable:          0 kb bounce:                0 kb writebacktmp:          0 kb commitlimit:     3846912 kb committed_as:    6744548 kb vmalloctotal:   34359738367 kb vmallocused:       14888 kb vmallocchunk:   34359719127 kb hardwarecorrupted:     0 kb anonhugepages:         0 kb hugepages_total:       0 hugepages_free:        0 hugepages_rsvd:        0 hugepages_surp:        0 hugepagesize:       2048 kb directmap4k:     7872512 kb directmap2m:           0 kb   cpu:total 2 (16 cores per cpu, 2 threads per core) family 6 model 62 stepping 4, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, aes, erms, ht, tsc  /proc/cpuinfo: processor   : 0 vendor_id   : genuineintel cpu family  : 6 model       : 62 model name  : intel(r) xeon(r) cpu e5-2670 v2 @ 2.50ghz stepping    : 4 microcode   : 0x415 cpu mhz     : 2500.058 cache size  : 25600 kb physical id : 1 siblings    : 2 core id     : 0 cpu cores   : 1 apicid      : 32 initial apicid  : 32 fpu     : yes fpu_exception   : yes cpuid level : 13 wp      : yes flags       : fpu de tsc msr pae cx8 apic sep cmov pat clflush mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nopl pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt tsc_deadline_timer aes rdrand hypervisor lahf_lm ida arat epb pln pts dtherm fsgsbase erms bogomips    : 5000.11 clflush size    : 64 cache_alignment : 64 address sizes   : 46 bits physical, 48 bits virtual power management:  processor   : 1 vendor_id   : genuineintel cpu family  : 6 model       : 62 model name  : intel(r) xeon(r) cpu e5-2670 v2 @ 2.50ghz stepping    : 4 microcode   : 0x415 cpu mhz     : 2500.058 cache size  : 25600 kb physical id : 1 siblings    : 2 core id     : 0 cpu cores   : 1 apicid      : 32 initial apicid  : 32 fpu     : yes fpu_exception   : yes cpuid level : 13 wp      : yes flags       : fpu de tsc msr pae cx8 apic sep cmov pat clflush mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc rep_good nopl pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt tsc_deadline_timer aes rdrand hypervisor lahf_lm ida arat epb pln pts dtherm fsgsbase erms bogomips    : 5000.11 clflush size    : 64 cache_alignment : 64 address sizes   : 46 bits physical, 48 bits virtual power management:    memory: 4k page, physical 7693824k(634168k free), swap 0k(0k free)  vm_info: openjdk 64-bit server vm (24.51-b03) linux-amd64 jre (1.7.0_55-b14), built on apr 17 2014 20:08:07 "buildd" gcc 4.8.2  time: thu may 29 20:30:58 2014 elapsed time: 979 seconds 

since runtime reports 2.245gig free, , reports failure when needing 1.104gig, seems logical request should succeed. when need 1.104gig, need contiguous block of memory. when contiguous block not available, jvm reports outofmemory exception.

do searches on heap fragmentation. heap fragmentation root problem.

one possible solution use nio byte buffers , allocatedirect.
memory allocated outside jvm heap space.

from javadoc:

a direct byte buffer may created invoking allocatedirect factory method of class. buffers returned method typically have higher allocation , deallocation costs non-direct buffers. contents of direct buffers may reside outside of normal garbage-collected heap, , impact upon memory footprint of application might not obvious. therefore recommended direct buffers allocated large, long-lived buffers subject underlying system's native i/o operations. in general best allocate direct buffers when yield measureable gain in program performance.