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0023949: OCC IncAllocator allocates second and further blocks with different size then first one

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NCollection_IncAllocator tuned to allocate blocks of equal size to reduce fragmentation and increase chances for block reuse
This commit is contained in:
pdn 2013-05-08 15:49:25 +04:00
parent 2a141d40f0
commit db56cc2d24
2 changed files with 27 additions and 6 deletions
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29
src/NCollection/NCollection_IncAllocator.cxx
View File

@ -185,10 +185,10 @@ NCollection_IncAllocator::NCollection_IncAllocator (const size_t theBlockSize)
Debug_Create(this);
#endif
const size_t aSize = IMEM_SIZE(sizeof(IBlock)) +
IMEM_SIZE((theBlockSize > 2*sizeof(IBlock)) ? theBlockSize : 24600);
IMEM_SIZE((theBlockSize > 2*sizeof(IBlock)) ? theBlockSize : DefaultBlockSize);
IBlock * const aBlock = (IBlock *) malloc (aSize * sizeof(aligned_t));
myFirstBlock = aBlock;
mySize = aSize;
mySize = aSize - IMEM_SIZE(sizeof(IBlock));
myMemSize = aSize * sizeof(aligned_t);
if (aBlock == NULL)
Standard_OutOfMemory::Raise("NCollection_IncAllocator: out of memory");
@ -229,6 +229,8 @@ void * NCollection_IncAllocator::Allocate (const size_t aSize)
aResult = (aligned_t *) allocateNewBlock (cSize+1);
if (aResult)
myFirstBlock -> p_free_space = myFirstBlock -> p_end_block;
else
Standard_OutOfMemory::Raise("NCollection_IncAllocator: out of memory");
} else
if (cSize <= IMEM_FREE(myFirstBlock)) {
/* If the requested size fits into the free space in the 1st block */
@ -250,6 +252,20 @@ void * NCollection_IncAllocator::Allocate (const size_t aSize)
aResult = (aligned_t *) allocateNewBlock (mySize);
if (aResult)
myFirstBlock -> p_free_space = aResult + cSize;
else
{
const size_t aDefault = IMEM_SIZE(DefaultBlockSize);
if (cSize > aDefault)
Standard_OutOfMemory::Raise("NCollection_IncAllocator: out of memory");
else
{
aResult = (aligned_t *) allocateNewBlock (aDefault);
if (aResult)
myFirstBlock -> p_free_space = aResult + cSize;
else
Standard_OutOfMemory::Raise("NCollection_IncAllocator: out of memory");
}
}
}
}
return aResult;
@ -299,12 +315,17 @@ void * NCollection_IncAllocator::Reallocate (void * theAddress,
// - extension of terminating allocation when the new size is too big
// In both cases create a new memory block, allocate memory and copy there
// the reallocated memory.
aligned_t * aResult = (aligned_t *) allocateNewBlock (mySize);
size_t cMaxSize = mySize > cNewSize ? mySize : cNewSize;
aligned_t * aResult = (aligned_t *) allocateNewBlock (cMaxSize);
if (aResult) {
myFirstBlock -> p_free_space = aResult + cNewSize;
for (unsigned i = 0; i < cOldSize; i++)
aResult[i] = anAddress[i];
}
else
{
Standard_OutOfMemory::Raise("NCollection_IncAllocator: out of memory");
}
return aResult;
}
@ -406,7 +427,5 @@ void * NCollection_IncAllocator::allocateNewBlock (const size_t cSize)
aResult = (aligned_t *) IMEM_ALIGN(&aBlock[1]);
myMemSize += aSz * sizeof(aligned_t);
}
else
Standard_OutOfMemory::Raise("NCollection_IncAllocator: out of memory");
return aResult;
}

4
src/NCollection/NCollection_IncAllocator.hxx
View File

@ -48,7 +48,7 @@ class NCollection_IncAllocator : public NCollection_BaseAllocator
// ---------- PUBLIC METHODS ----------
//! Constructor
Standard_EXPORT NCollection_IncAllocator (const size_t theBlockSize = 24600);
Standard_EXPORT NCollection_IncAllocator (const size_t theBlockSize = DefaultBlockSize);
//! Allocate memory with given size. Returns NULL on failure
Standard_EXPORT virtual void* Allocate (const size_t size);
@ -78,6 +78,8 @@ class NCollection_IncAllocator : public NCollection_BaseAllocator
Standard_EXPORT void Reset (const Standard_Boolean
doReleaseMem=Standard_True);
static const size_t DefaultBlockSize = 24600;
protected:
struct IBlock;