| 1 | |
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| 2 | The Hoard Multiprocessor Memory Allocator |
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| 3 | <http://www.hoard.org> |
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| 4 | |
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| 5 | Version Information |
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| 6 | ------------------- |
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| 7 | |
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| 8 | version 3.7.1: |
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| 9 | * Fixed a serious bug for Windows in thread reclamation. |
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| 10 | * Fixed a small memory leak in thread creation. |
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| 11 | * Initial port to Windows 64. |
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| 12 | |
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| 13 | version 3.7: |
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| 14 | * Streamlined fast path for allocation, speeding 32 and 64-bit code. |
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| 15 | * Use pthread_* based thread-specific data for x86-64, where it's faster. |
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| 16 | |
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| 17 | version 3.6.2: |
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| 18 | * Fixed build for Mac OS X (Darwin). |
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| 19 | * Fixed to support older versions of Sun compilers. |
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| 20 | * Added FreeBSD ("freebsd") as a target. |
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| 21 | |
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| 22 | version 3.6.1: |
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| 23 | * Added x86-64 target for Linux/gcc. |
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| 24 | * Added support for posix_memalign (for Unix systems). |
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| 25 | * Added static library build option for Linux. |
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| 26 | |
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| 27 | version 3.6: |
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| 28 | * Improved performance, especially from thread-specific heap allocation. |
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| 29 | * Revised algorithm for large objects to reduce mmap fragmentation. |
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| 30 | * Added support for Solaris x86 (32 and 64 bit). |
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| 31 | * Fixed a problem for 64-bit builds. |
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| 32 | * Removed support for Detours. |
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| 33 | * Restored to top-level status (moved heaplayers to a directory). |
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| 34 | * Changed thread-specific data for Windows to support use in DLLs. |
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| 35 | * Build now fully supports Mac OS X (Darwin). |
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| 36 | |
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| 37 | version 3.5.1: |
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| 38 | * Eliminated a (rare) memory error. |
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| 39 | |
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| 40 | version 3.5.0: |
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| 41 | * Resolved some cross-platform memory leaks, notably |
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| 42 | for Windows due to surprising VirtualFree API |
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| 43 | (which doesn't reclaim memory unless size argument is 0). |
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| 44 | |
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| 45 | version 3.4.0: |
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| 46 | |
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| 47 | * Added support for X86-64, Apple OS-X, |
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| 48 | and Microsoft's Visual Studio 2005. |
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| 49 | |
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| 50 | * Restored Detours version, but with thread-specific local heaps disabled. |
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| 51 | |
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| 52 | * Removed all dependencies on STL. |
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| 53 | |
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| 54 | version 3.3.0: |
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| 55 | |
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| 56 | * Added thread-specific local heaps, which substantially |
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| 57 | improve performance by eliminating most atomic operations. |
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| 58 | |
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| 59 | version 3.2.3: |
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| 60 | |
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| 61 | * Bug fix for Unix platforms, now allowing calls to |
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| 62 | pthread_create with a NULL attribute. |
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| 63 | |
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| 64 | * Added support for ARM architectures. |
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| 65 | |
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| 66 | version 3.2.2: |
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| 67 | |
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| 68 | * Reduces memory consumption for large objects (Windows). |
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| 69 | |
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| 70 | version 3.2.1: |
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| 71 | |
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| 72 | * Maintenance release: fixes a bug for 64-bit versions |
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| 73 | and changes the Windows build (for winhoard) slightly. |
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| 74 | |
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| 75 | version 3.2: |
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| 76 | |
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| 77 | * An improved Windows build (see NOTES.windows). |
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| 78 | * An algorithmic change (essentially a variant of thread-local |
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| 79 | allocation buffers) that boosts performance by avoiding atomic |
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| 80 | operations. |
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| 81 | |
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| 82 | version 3.1: |
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| 83 | |
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| 84 | * Several performance optimizations. |
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| 85 | * A minor bug fix for non-Windows platforms. |
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| 86 | |
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| 87 | version 3: |
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| 88 | |
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| 89 | * Switched over to Heap Layers-based implementation. |
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| 90 | * Added single-threaded optimization (if no threads spawned, no locks). |
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| 91 | |
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| 92 | version 2.1.2: |
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| 93 | |
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| 94 | * Made the code 64-bit clean. |
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| 95 | * Fixed a bug in recycling free memory on uniprocessors. |
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| 96 | |
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| 97 | version 2.1.1: |
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| 98 | |
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| 99 | * Added Debian distribution support. |
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| 100 | * Fixed a Linux compilation bug in a benchmark. |
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| 101 | * Added automake-produced Makefiles for all benchmarks. |
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| 102 | * Added pthread_atfork handlers to avoid deadlocks when |
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| 103 | using fork(). |
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| 104 | |
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| 105 | version 2.1.0: |
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| 106 | |
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| 107 | * Now ships as a DLL for Windows. |
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| 108 | * Reduced internal fragmentation for small objects. |
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| 109 | * A variety of performance improvements. |
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| 110 | * Patched to work on 64-bit Solaris. |
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| 111 | * Removed BeOS support. |
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| 112 | * Simplified user-level locking. |
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| 113 | * Incorporated Doug Lea's malloc as a faster backing store |
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| 114 | than mmap(), for non-Windows execution. |
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| 115 | |
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| 116 | version 2.0.6: |
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| 117 | |
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| 118 | * Fix to allow Hoard to work with MFC under Windows. |
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| 119 | |
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| 120 | version 2.0.5: |
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| 121 | |
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| 122 | * Fix to work with the new Sun WorkShop compiler. |
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| 123 | |
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| 124 | version 2.0.4: |
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| 125 | |
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| 126 | * Fix to allow Hoard to work with Debug builds under Windows. |
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| 127 | |
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| 128 | version 2.0.3: |
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| 129 | |
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| 130 | * Added a fix for better fragmentation on uniprocessors, |
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| 131 | added a "winprojects" directory for easier building on Windows |
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| 132 | under Visual Studio, improved realloc performance, and fixed a bug |
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| 133 | for out-of-memory conditions. |
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| 134 | |
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| 135 | version 2.0.2: |
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| 136 | |
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| 137 | * Fixed a memory leak for SGI. |
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| 138 | |
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| 139 | version 2.0.1: |
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| 140 | |
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| 141 | * Fixed compilation on AIX with xlC (IBM). |
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| 142 | |
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| 143 | version 2.0: |
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| 144 | |
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| 145 | * Added very aggressive superblock recycling. Now an empty |
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| 146 | superblock is immediately available for reuse for another size |
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| 147 | class. This can dramatically reduce fragmentation. |
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| 148 | |
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| 149 | * We now preferentially allocate from recently-touched |
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| 150 | superblocks to improve page locality. |
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| 151 | |
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| 152 | * Incorporated a protocol to guarantee swift superblock |
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| 153 | 'acquisition' by free(). |
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| 154 | |
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| 155 | version 1.5.3: (not generally released) |
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| 156 | |
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| 157 | * Miscellaneous bug fixes. |
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| 158 | |
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| 159 | version 1.5.2: |
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| 160 | |
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| 161 | * Fixed a problem on some Linux systems that caused |
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| 162 | many large allocations to fail. |
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| 163 | * Fixed a call to VirtualFree which didn't actually |
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| 164 | release memory back to the system. |
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| 165 | |
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| 166 | |
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| 167 | version 1.5.1: |
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| 168 | |
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| 169 | * Changed initialization of the process heap to fix |
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| 170 | a problem with Visual C++. |
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| 171 | |
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| 172 | version 1.5: |
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| 173 | |
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| 174 | * Large blocks (> 4K) are now immediately returned to |
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| 175 | the system when they are freed. |
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| 176 | |
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| 177 | * Made a number of improvements to the algorithm that ensure |
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| 178 | O(1) cost for malloc & free and guarantee low contention for |
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| 179 | free's. (These will be discussed in a paper currently in |
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| 180 | progress.) Also added a method that further reduces the number |
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| 181 | of system calls when allocating memory. |
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| 182 | |
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| 183 | * Added superblock recycling to reduce fragmentation. |
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| 184 | |
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| 185 | * Hoard now compiles with Sun's Workshop compilers (version 5.0) |
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| 186 | on SPARCs. (Thanks to Ganesan Rajagopal of Novell for the |
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| 187 | undocumented .il trick for inlining assembly.) |
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| 188 | |
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| 189 | * Ported to AIX (IBM, PowerPC-based). |
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| 190 | |
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| 191 | version 1.4.2: |
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| 192 | |
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| 193 | * A bug fix -- corrects a subtle problem with memalign. |
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| 194 | Hoard now successfully passes Wolfram Gloger's |
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| 195 | malloc-test (included with the distribution). |
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| 196 | |
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| 197 | version 1.4.1: |
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| 198 | |
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| 199 | * A few fixes for backward compatibility with Solaris 2.6. |
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| 200 | |
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| 201 | version 1.4: |
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| 202 | |
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| 203 | * Doubled the speed of calls to free(). |
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| 204 | * Further improved scalability, especially on Solaris. |
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| 205 | * Reduced memory consumption and improved performance on |
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| 206 | uniprocessors. |
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| 207 | * Changed the lock implementation for Windows from spin to |
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| 208 | spin-yield, as in the UNIX implementations (thanks to Paul |
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| 209 | Larson of Microsoft Research for pointing out how to do this). |
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| 210 | * Removed the shbench benchmark from the distribution, per |
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| 211 | request from MicroQuill, Inc. |
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| 212 | |
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| 213 | version 1.3.3: |
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| 214 | |
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| 215 | * Changed some casts of pointers to unsigned longs |
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| 216 | to allow Hoard to work on 64-bit machines (read: SGI O2K). |
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| 217 | |
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| 218 | version 1.3.2: |
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| 219 | |
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| 220 | * Minor modifications for the Windows NT port, |
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| 221 | along with workspace and project files for Visual C++ |
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| 222 | (thanks to Arnd Bohm). |
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| 223 | |
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| 224 | version 1.3.1: |
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| 225 | |
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| 226 | * Included a customized version of 'atexit' for Linux, |
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| 227 | since the newest version of libc (2.1.2) caused Hoard to |
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| 228 | deadlock (it called malloc internally). |
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| 229 | |
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| 230 | version 1.3: |
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| 231 | |
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| 232 | * Ported to the BeOS (thanks to Trey Boudreau of Be). |
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| 233 | * Replaced the per-sizeclass locks with per-heap locks, |
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| 234 | since this has no impact on scalability and reduces Hoard's |
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| 235 | static footprint. |
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| 236 | |
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| 237 | version 1.2: |
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| 238 | |
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| 239 | * Dramatically improved performance with fast user-level locks |
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| 240 | for SPARC, x86, and the SGI. |
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| 241 | * Added sproc support (for the SGI). |
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| 242 | * Hoard can now be built under Visual C++ (thanks to John |
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| 243 | Hickin). |
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| 244 | |
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| 245 | version 1.1: |
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| 246 | |
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| 247 | * Added autoconf and automake scripts to facilitate compilation |
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| 248 | and installation (including shared libraries). |
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| 249 | (thanks to Ganesan Rajagopal of Novell for submitting the scripts) |
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| 250 | |
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| 251 | version 1.0.3: |
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| 252 | |
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| 253 | * Hoard now scales on OS's besides Linux and Solaris. |
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| 254 | (the thread ID hash function was pathological for other OS's) |
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| 255 | |
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| 256 | version 1.0.2: |
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| 257 | |
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| 258 | * Ported to Windows NT. |
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| 259 | * Added in the benchmark suite (larson, linux-scalability, shbench). |
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| 260 | |
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| 261 | version 1.0.1: |
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| 262 | |
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| 263 | * Fixed a build problem. |
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| 264 | |
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| 265 | version 1.0: |
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| 266 | |
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| 267 | * Initial release. |
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| 268 | |
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