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FastMM4DataCollector.pas
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FastMM4DataCollector.pas
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unit FastMM4DataCollector;
{$I FastMM4Options.inc}
interface
type
TStaticCollector = record
strict private const
CDefaultPromoteGen1_sec = 1; // promote every second
CDefaultPromoteGen1Count = 1; // promote allocations with Count > 1
CGeneration1Size = 1024;
CGeneration2Size = 256;
CCollectedDataSize = CGeneration2Size;
CMaxPointers = 11; // same as in FastMM4
public type
TPointers = record
Pointers: array [1..CMaxPointers] of Pointer;
Count : integer;
class operator Equal(const a, b: TPointers): boolean;
end;
TDataInfo = record
Data : TPointers;
Count: integer;
end;
TCollectedData = array [1..CCollectedDataSize] of TDataInfo;
TGenerationOverflowCount = record
Generation1: integer;
Generation2: integer;
end;
strict private type
PDataInfo = ^TDataInfo;
TGenerationPlaceholder = array [1..1] of TDataInfo;
PGenerationPlaceholder = ^TGenerationPlaceholder;
TGenerationInfo = record
Data : PGenerationPlaceholder;
Size : integer;
Last : integer;
NextGeneration : integer;
PromoteEvery_sec: integer;
PromoteCountOver: integer;
OverflowCount : integer;
LastCheck_ms : int64;
end;
var
FGeneration1 : array [1..CGeneration1Size] of TDataInfo;
FGeneration2 : array [1..CGeneration2Size] of TDataInfo;
FGenerationInfo: array [0..2] of TGenerationInfo; //gen0 is used for merging
FLocked : ByteBool;
FPadding : array [1..3] of byte;
function GetGen1_PromoteCountOver: integer;
function GetGen1_PromoteEvery_sec: integer;
function GetOverflowCount: TGenerationOverflowCount;
procedure Lock;
function Now_ms: int64; inline;
procedure SetGen1_PromoteCountOver(const value: integer);
procedure SetGen1_PromoteEvery_sec(const value: integer);
private
procedure AddToGeneration(generation: integer; const aData: TPointers;
count: integer = 1);
procedure CheckPromoteGeneration(generation: integer); inline;
function FindInGeneration(generation: integer; const aData: TPointers): integer; inline;
function FindInsertionPoint(generation, count: integer): integer; inline;
procedure FlushAllGenerations;
function InsertIntoGeneration(generation: integer; const dataInfo: TDataInfo): boolean;
procedure PromoteGeneration(oldGen, newGen: integer);
procedure ResortGeneration(generation, idxData: integer);
public
procedure Initialize;
procedure Add(const pointers: pointer; count: integer);
procedure GetData(var data: TCollectedData; var count: integer);
procedure Merge(var mergedData: TCollectedData; var mergedCount: integer;
const newData: TCollectedData; newCount: integer);
property Gen1_PromoteCountOver: integer read GetGen1_PromoteCountOver
write SetGen1_PromoteCountOver;
property OverflowCount: TGenerationOverflowCount read GetOverflowCount;
property Gen1_PromoteEvery_sec: integer read GetGen1_PromoteEvery_sec write
SetGen1_PromoteEvery_sec;
end;
PStaticCollector = ^TStaticCollector;
implementation
uses
Winapi.Windows; //used in Now_ms
{$RANGECHECKS OFF}
type
PByteBool = ^ByteBool;
// Copied from FastMM4.pas
function LockCmpxchg8(CompareVal, NewVal: ByteBool; AAddress: PByteBool): ByteBool;
asm
{$if SizeOf(Pointer) = 4}
{On entry:
al = CompareVal,
dl = NewVal,
ecx = AAddress}
{$ifndef LINUX}
lock cmpxchg [ecx], dl
{$else}
{Workaround for Kylix compiler bug}
db $F0, $0F, $B0, $11
{$endif}
{$else}
{On entry:
cl = CompareVal
dl = NewVal
r8 = AAddress}
.noframe
mov rax, rcx
lock cmpxchg [r8], dl
{$ifend}
end;
{ TStaticCollector.TPointers }
class operator TStaticCollector.TPointers.Equal(const a, b: TPointers): boolean;
var
i: integer;
begin
Result := a.Count = b.Count;
if Result then
for i := 1 to a.Count do
if a.Pointers[i] <> b.Pointers[i] then
Exit(false);
end;
{ TStaticCollector }
procedure TStaticCollector.Add(const pointers: pointer; count: integer);
var
ptrData: TPointers;
begin
Lock;
ptrData.Count := CMaxPointers;
if count < CMaxPointers then
ptrData.Count := count;
Move(pointers^, ptrData.Pointers[1], ptrData.Count * SizeOf(pointer));
AddToGeneration(1, ptrData);
FLocked := false;
end;
procedure TStaticCollector.AddToGeneration(generation: integer; const aData: TPointers;
count: integer = 1);
var
dataInfo: TDataInfo;
idxData : integer;
begin
CheckPromoteGeneration(generation);
with FGenerationInfo[generation] do begin
idxData := FindInGeneration(generation, aData);
if idxData >= 1 then begin
Data^[idxData].Count := Data^[idxData].Count + count;
ResortGeneration(generation, idxData);
end
else begin
dataInfo.Data := aData;
dataInfo.Count := count;
InsertIntoGeneration(generation, dataInfo);
end;
end;
end; { TStaticCollector.AddToGeneration }
procedure TStaticCollector.CheckPromoteGeneration(generation: integer);
begin
with FGenerationInfo[generation] do begin
if NextGeneration > 0 then begin
if LastCheck_ms = 0 then
LastCheck_ms := Now_ms
else if ((Now_ms - LastCheck_ms) div 1000) >= PromoteEvery_sec then begin
PromoteGeneration(generation, NextGeneration);
LastCheck_ms := Now_ms;
end;
end;
end;
end;
function TStaticCollector.FindInGeneration(generation: integer; const aData: TPointers):
integer;
begin
with FGenerationInfo[generation] do begin
for Result := 1 to Last do
if Data^[Result].Data = aData then
Exit;
end;
Result := 0;
end;
function TStaticCollector.FindInsertionPoint(generation, count: integer): integer;
var
insert: integer;
begin
with FGenerationInfo[generation] do begin
for insert := Last downto 1 do begin
if Data^[insert].Count > count then
Exit(insert+1);
end;
Result := 1;
end;
end;
procedure TStaticCollector.FlushAllGenerations;
var
generation: integer;
nextGen : integer;
begin
generation := 1;
while generation <> 0 do begin
nextGen := FGenerationInfo[generation].NextGeneration;
if nextGen > 0 then
PromoteGeneration(generation, nextGen);
generation := nextGen;
end;
end;
procedure TStaticCollector.GetData(var data: TCollectedData; var count: integer);
begin
Lock;
FlushAllGenerations;
Assert(Length(data) = Length(FGeneration2));
count := FGenerationInfo[2].Last;
Move(FGeneration2[1], data[1], count * SizeOf(data[1]));
FLocked := false;
end;
function TStaticCollector.GetGen1_PromoteCountOver: integer;
begin
Result := FGenerationInfo[1].PromoteCountOver;
end;
function TStaticCollector.GetGen1_PromoteEvery_sec: integer;
begin
Result := FGenerationInfo[1].PromoteEvery_sec;
end;
function TStaticCollector.GetOverflowCount: TGenerationOverflowCount;
begin
Result.Generation1 := FGenerationInfo[1].OverflowCount;
Result.Generation2 := FGenerationInfo[2].OverflowCount;
end;
procedure TStaticCollector.Initialize;
begin
Assert(SizeOf(TStaticCollector) mod SizeOf(pointer) = 0);
with FGenerationInfo[1] do begin
Data := PGenerationPlaceholder(@FGeneration1);
Size := CGeneration1Size;
Last := 0;
NextGeneration := 2;
PromoteEvery_sec := CDefaultPromoteGen1_sec;
PromoteCountOver := CDefaultPromoteGen1Count;
LastCheck_ms := 0;
end;
with FGenerationInfo[2] do begin
Data := PGenerationPlaceholder(@FGeneration2);
Size := CGeneration2Size;
NextGeneration := 0;
end;
end;
function TStaticCollector.InsertIntoGeneration(generation: integer; const dataInfo:
TDataInfo): boolean;
var
idx: integer;
begin
// We already know that this element does not exist in the generation.
Result := true;
with FGenerationInfo[generation] do begin
idx := FindInsertionPoint(generation, dataInfo.Count);
if idx > Last then begin
if Last = Size then begin
Inc(OverflowCount);
Result := false;
end
else begin
Inc(Last);
Data^[Last] := dataInfo;
end;
end
else begin
if Last < Size then begin
Move(Data^[idx], Data^[idx+1], (Last-idx+1) * SizeOf(Data^[idx]));
Inc(Last);
end
else begin
if Last > idx then
Move(Data^[idx], Data^[idx+1], (Last-idx) * SizeOf(Data^[idx]));
Inc(OverflowCount);
end;
Data^[idx] := dataInfo;
end;
end;
end;
procedure TStaticCollector.Lock;
begin
{$ifndef AssumeMultiThreaded}
if IsMultiThread then
{$endif}
begin
while LockCmpxchg8(False, True, @FLocked) <> False do
begin
{$ifdef NeverSleepOnThreadContention}
{$ifdef UseSwitchToThread}
SwitchToThread;
{$endif}
{$else}
Sleep(0);
if LockCmpxchg8(False, True, @FLocked) = False then
Break;
Sleep(1);
{$endif}
end;
end;
end;
procedure TStaticCollector.Merge(var mergedData: TCollectedData;
var mergedCount: integer; const newData: TCollectedData; newCount: integer);
var
iNew: integer;
begin
// Merges two sorted arrays.
FGenerationInfo[0].Data := PGenerationPlaceholder(@mergedData);
FGenerationInfo[0].Last := mergedCount;
FGenerationInfo[0].Size := CCollectedDataSize;
FGenerationInfo[0].NextGeneration := 0;
for iNew := 1 to newCount do
AddToGeneration(0, newData[iNew].Data, newData[iNew].Count);
mergedCount := FGenerationInfo[0].Last;
end;
function TStaticCollector.Now_ms: int64;
var
st: TSystemTime;
begin
// We cannot use SysUtils as that gets memory allocator called before FastMM is initialized.
GetSystemTime(st);
SystemTimeToFileTime(st, TFileTime(Result));
Result := Result div 10000;
end;
procedure TStaticCollector.PromoteGeneration(oldGen, newGen: integer);
var
canInsert : boolean;
idxNew : integer;
idxOld : integer;
newGenData: PGenerationPlaceholder;
pOldData : PDataInfo;
begin
canInsert := true;
newGenData := FGenerationInfo[newGen].Data;
with FGenerationInfo[oldGen] do begin
for idxOld := 1 to Last do begin
pOldData := @Data^[idxOld];
if pOldData^.Count <= PromoteCountOver then
break; //for idxOld
idxNew := FindInGeneration(newGen, pOldData^.Data);
if idxNew > 0 then begin
newGenData^[idxNew].Count := newGenData^[idxNew].Count + pOldData^.Count;
ResortGeneration(newGen, idxNew);
end
else if canInsert then
canInsert := InsertIntoGeneration(newGen, pOldData^)
else with FGenerationInfo[newGen] do
Inc(OverflowCount);
end; //for idxOld
Last := 0;
end;
end;
procedure TStaticCollector.ResortGeneration(generation, idxData: integer);
var
dataInfo: TDataInfo;
idx : integer;
begin
// Data^[idxData].Count was just updated, resort the generation.
with FGenerationInfo[generation] do begin
idx := FindInsertionPoint(generation, Data^[idxData].Count);
if idx < idxData then begin
dataInfo := Data^[idxData];
Move(Data^[idx], Data^[idx+1], (idxData-idx) * SizeOf(Data^[idx]));
Data^[idx] := dataInfo;
end;
end;
end;
procedure TStaticCollector.SetGen1_PromoteCountOver(const value: integer);
begin
FGenerationInfo[1].PromoteCountOver := value;
end;
procedure TStaticCollector.SetGen1_PromoteEvery_sec(const value: integer);
begin
FGenerationInfo[1].PromoteEvery_sec := value;
end;
end.