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GHC.RTS.Flags

Safe Haskell	None
Language	Haskell2010

Description

Accessors to GHC RTS flags. Descriptions of flags can be seen in GHC User's Guide, or by running RTS help message using +RTS --help.

Since: 4.8.0.0

type RtsTime = Word64 Source

Time is defined as a StgWord64 in stg/Types.h

Since: 4.8.2.0

type RtsNat = Word32 Source

nat defined in rts/Types.h

Since: 4.8.2.0

data RTSFlags Source

Parameters of the runtime system

Since: 4.8.0.0

Constructors

RTSFlags
Fields gcFlags :: GCFlags concurrentFlags :: ConcFlags miscFlags :: MiscFlags debugFlags :: DebugFlags costCentreFlags :: CCFlags profilingFlags :: ProfFlags traceFlags :: TraceFlags tickyFlags :: TickyFlags

Instances

Show RTSFlags
Methods showsPrec :: Int -> RTSFlags -> ShowS Source show :: RTSFlags -> String Source showList :: [RTSFlags] -> ShowS Source

data GiveGCStats Source

Should we produce a summary of the garbage collector statistics after the program has exited?

Since: 4.8.2.0

Constructors

NoGCStats
CollectGCStats
OneLineGCStats
SummaryGCStats
VerboseGCStats

Instances

Enum GiveGCStats
Methods succ :: GiveGCStats -> GiveGCStats Source pred :: GiveGCStats -> GiveGCStats Source toEnum :: Int -> GiveGCStats Source fromEnum :: GiveGCStats -> Int Source enumFrom :: GiveGCStats -> [GiveGCStats] Source enumFromThen :: GiveGCStats -> GiveGCStats -> [GiveGCStats] Source enumFromTo :: GiveGCStats -> GiveGCStats -> [GiveGCStats] Source enumFromThenTo :: GiveGCStats -> GiveGCStats -> GiveGCStats -> [GiveGCStats] Source
Show GiveGCStats
Methods showsPrec :: Int -> GiveGCStats -> ShowS Source show :: GiveGCStats -> String Source showList :: [GiveGCStats] -> ShowS Source

data GCFlags Source

Parameters of the garbage collector.

Since: 4.8.0.0

Constructors

GCFlags

Fields

statsFile :: Maybe FilePath
giveStats :: GiveGCStats
maxStkSize :: RtsNat
initialStkSize :: RtsNat
stkChunkSize :: RtsNat
stkChunkBufferSize :: RtsNat
maxHeapSize :: RtsNat
minAllocAreaSize :: RtsNat
minOldGenSize :: RtsNat
heapSizeSuggestion :: RtsNat
heapSizeSuggestionAuto :: Bool
oldGenFactor :: Double
pcFreeHeap :: Double
generations :: RtsNat
steps :: RtsNat
squeezeUpdFrames :: Bool
compact :: Bool
True = "compact all the time"
compactThreshold :: Double
sweep :: Bool
use "mostly mark-sweep" instead of copying for the oldest generation
ringBell :: Bool
frontpanel :: Bool
idleGCDelayTime :: RtsTime
doIdleGC :: Bool
heapBase :: Word
address to ask the OS for memory
allocLimitGrace :: Word

Instances

Show GCFlags
Methods showsPrec :: Int -> GCFlags -> ShowS Source show :: GCFlags -> String Source showList :: [GCFlags] -> ShowS Source

data ConcFlags Source

Parameters concerning context switching

Since: 4.8.0.0

Constructors

ConcFlags
Fields ctxtSwitchTime :: RtsTime ctxtSwitchTicks :: Int

Instances

Show ConcFlags
Methods showsPrec :: Int -> ConcFlags -> ShowS Source show :: ConcFlags -> String Source showList :: [ConcFlags] -> ShowS Source

data MiscFlags Source

Miscellaneous parameters

Since: 4.8.0.0

Constructors

MiscFlags
Fields tickInterval :: RtsTime installSignalHandlers :: Bool machineReadable :: Bool linkerMemBase :: Word address to ask the OS for memory for the linker, 0 ==> off

Instances

Show MiscFlags
Methods showsPrec :: Int -> MiscFlags -> ShowS Source show :: MiscFlags -> String Source showList :: [MiscFlags] -> ShowS Source

data DebugFlags Source

Flags to control debugging output & extra checking in various subsystems.

Since: 4.8.0.0

Constructors

DebugFlags
Fields scheduler :: Bool `s` interpreter :: Bool `i` weak :: Bool `w` gccafs :: Bool `G` gc :: Bool `g` block_alloc :: Bool `b` sanity :: Bool `S` stable :: Bool `t` prof :: Bool `p` linker :: Bool `l` the object linker apply :: Bool `a` stm :: Bool `m` squeeze :: Bool `z` stack squeezing & lazy blackholing hpc :: Bool `c` coverage sparks :: Bool `r`

Instances

Show DebugFlags
Methods showsPrec :: Int -> DebugFlags -> ShowS Source show :: DebugFlags -> String Source showList :: [DebugFlags] -> ShowS Source

data DoCostCentres Source

Should the RTS produce a cost-center summary?

Since: 4.8.2.0

Constructors

CostCentresNone
CostCentresSummary
CostCentresVerbose
CostCentresAll
CostCentresXML

Instances

Enum DoCostCentres
Methods succ :: DoCostCentres -> DoCostCentres Source pred :: DoCostCentres -> DoCostCentres Source toEnum :: Int -> DoCostCentres Source fromEnum :: DoCostCentres -> Int Source enumFrom :: DoCostCentres -> [DoCostCentres] Source enumFromThen :: DoCostCentres -> DoCostCentres -> [DoCostCentres] Source enumFromTo :: DoCostCentres -> DoCostCentres -> [DoCostCentres] Source enumFromThenTo :: DoCostCentres -> DoCostCentres -> DoCostCentres -> [DoCostCentres] Source
Show DoCostCentres
Methods showsPrec :: Int -> DoCostCentres -> ShowS Source show :: DoCostCentres -> String Source showList :: [DoCostCentres] -> ShowS Source

data CCFlags Source

Parameters pertaining to the cost-center profiler.

Since: 4.8.0.0

Constructors

CCFlags
Fields doCostCentres :: DoCostCentres profilerTicks :: Int msecsPerTick :: Int

Instances

Show CCFlags
Methods showsPrec :: Int -> CCFlags -> ShowS Source show :: CCFlags -> String Source showList :: [CCFlags] -> ShowS Source

data DoHeapProfile Source

What sort of heap profile are we collecting?

Since: 4.8.2.0

Constructors

NoHeapProfiling
HeapByCCS
HeapByMod
HeapByDescr
HeapByType
HeapByRetainer
HeapByLDV
HeapByClosureType

Instances

Enum DoHeapProfile
Methods succ :: DoHeapProfile -> DoHeapProfile Source pred :: DoHeapProfile -> DoHeapProfile Source toEnum :: Int -> DoHeapProfile Source fromEnum :: DoHeapProfile -> Int Source enumFrom :: DoHeapProfile -> [DoHeapProfile] Source enumFromThen :: DoHeapProfile -> DoHeapProfile -> [DoHeapProfile] Source enumFromTo :: DoHeapProfile -> DoHeapProfile -> [DoHeapProfile] Source enumFromThenTo :: DoHeapProfile -> DoHeapProfile -> DoHeapProfile -> [DoHeapProfile] Source
Show DoHeapProfile
Methods showsPrec :: Int -> DoHeapProfile -> ShowS Source show :: DoHeapProfile -> String Source showList :: [DoHeapProfile] -> ShowS Source

data ProfFlags Source

Parameters of the cost-center profiler

Since: 4.8.0.0

Constructors

ProfFlags

Fields

doHeapProfile :: DoHeapProfile
heapProfileInterval :: RtsTime
time between samples
heapProfileIntervalTicks :: Word
ticks between samples (derived)
includeTSOs :: Bool
showCCSOnException :: Bool
maxRetainerSetSize :: Word
ccsLength :: Word
modSelector :: Maybe String
descrSelector :: Maybe String
typeSelector :: Maybe String
ccSelector :: Maybe String
ccsSelector :: Maybe String
retainerSelector :: Maybe String
bioSelector :: Maybe String

Instances

Show ProfFlags
Methods showsPrec :: Int -> ProfFlags -> ShowS Source show :: ProfFlags -> String Source showList :: [ProfFlags] -> ShowS Source

data DoTrace Source

Is event tracing enabled?

Since: 4.8.2.0

Constructors

TraceNone	no tracing
TraceEventLog	send tracing events to the event log
TraceStderr	send tracing events to `stderr`

Instances

Enum DoTrace
Methods succ :: DoTrace -> DoTrace Source pred :: DoTrace -> DoTrace Source toEnum :: Int -> DoTrace Source fromEnum :: DoTrace -> Int Source enumFrom :: DoTrace -> [DoTrace] Source enumFromThen :: DoTrace -> DoTrace -> [DoTrace] Source enumFromTo :: DoTrace -> DoTrace -> [DoTrace] Source enumFromThenTo :: DoTrace -> DoTrace -> DoTrace -> [DoTrace] Source
Show DoTrace
Methods showsPrec :: Int -> DoTrace -> ShowS Source show :: DoTrace -> String Source showList :: [DoTrace] -> ShowS Source

data TraceFlags Source

Parameters pertaining to event tracing

Since: 4.8.0.0

Constructors

TraceFlags
Fields tracing :: DoTrace timestamp :: Bool show timestamp in stderr output traceScheduler :: Bool trace scheduler events traceGc :: Bool trace GC events sparksSampled :: Bool trace spark events by a sampled method sparksFull :: Bool trace spark events 100% accurately user :: Bool trace user events (emitted from Haskell code)