Safe Haskell	None
Language	Haskell2010

GHC.RTS.Flags

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

Synopsis

Documentation

type RtsTime = Word64 #

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

Since: 4.8.2.0

data RTSFlags #

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 parFlags :: ParFlags

Instances

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

data GiveGCStats #

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 #	Since: 4.8.0.0
Methods succ :: GiveGCStats -> GiveGCStats # pred :: GiveGCStats -> GiveGCStats # toEnum :: Int -> GiveGCStats # fromEnum :: GiveGCStats -> Int # enumFrom :: GiveGCStats -> [GiveGCStats] # enumFromThen :: GiveGCStats -> GiveGCStats -> [GiveGCStats] # enumFromTo :: GiveGCStats -> GiveGCStats -> [GiveGCStats] # enumFromThenTo :: GiveGCStats -> GiveGCStats -> GiveGCStats -> [GiveGCStats] #
Show GiveGCStats #
Methods showsPrec :: Int -> GiveGCStats -> ShowS # show :: GiveGCStats -> String # showList :: [GiveGCStats] -> ShowS #

data GCFlags #

Parameters of the garbage collector.

Since: 4.8.0.0

Constructors

GCFlags

Fields

statsFile :: Maybe FilePath
giveStats :: GiveGCStats
maxStkSize :: Word32
initialStkSize :: Word32
stkChunkSize :: Word32
stkChunkBufferSize :: Word32
maxHeapSize :: Word32
minAllocAreaSize :: Word32
largeAllocLim :: Word32
nurseryChunkSize :: Word32
minOldGenSize :: Word32
heapSizeSuggestion :: Word32
heapSizeSuggestionAuto :: Bool
oldGenFactor :: Double
pcFreeHeap :: Double
generations :: Word32
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
idleGCDelayTime :: RtsTime
doIdleGC :: Bool
heapBase :: Word
address to ask the OS for memory
allocLimitGrace :: Word
numa :: Bool
numaMask :: Word

Instances

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

data ConcFlags #

Parameters concerning context switching

Since: 4.8.0.0

Constructors

ConcFlags
Fields ctxtSwitchTime :: RtsTime ctxtSwitchTicks :: Int

Instances

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

data MiscFlags #

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 # show :: MiscFlags -> String # showList :: [MiscFlags] -> ShowS #

data DebugFlags #

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 # show :: DebugFlags -> String # showList :: [DebugFlags] -> ShowS #

data DoCostCentres #

Should the RTS produce a cost-center summary?

Since: 4.8.2.0

Constructors

CostCentresNone
CostCentresSummary
CostCentresVerbose
CostCentresAll
CostCentresJSON

Instances

Enum DoCostCentres #	Since: 4.8.0.0
Methods succ :: DoCostCentres -> DoCostCentres # pred :: DoCostCentres -> DoCostCentres # toEnum :: Int -> DoCostCentres # fromEnum :: DoCostCentres -> Int # enumFrom :: DoCostCentres -> [DoCostCentres] # enumFromThen :: DoCostCentres -> DoCostCentres -> [DoCostCentres] # enumFromTo :: DoCostCentres -> DoCostCentres -> [DoCostCentres] # enumFromThenTo :: DoCostCentres -> DoCostCentres -> DoCostCentres -> [DoCostCentres] #
Show DoCostCentres #
Methods showsPrec :: Int -> DoCostCentres -> ShowS # show :: DoCostCentres -> String # showList :: [DoCostCentres] -> ShowS #

data CCFlags #

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 # show :: CCFlags -> String # showList :: [CCFlags] -> ShowS #

data DoHeapProfile #

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 #	Since: 4.8.0.0
Methods succ :: DoHeapProfile -> DoHeapProfile # pred :: DoHeapProfile -> DoHeapProfile # toEnum :: Int -> DoHeapProfile # fromEnum :: DoHeapProfile -> Int # enumFrom :: DoHeapProfile -> [DoHeapProfile] # enumFromThen :: DoHeapProfile -> DoHeapProfile -> [DoHeapProfile] # enumFromTo :: DoHeapProfile -> DoHeapProfile -> [DoHeapProfile] # enumFromThenTo :: DoHeapProfile -> DoHeapProfile -> DoHeapProfile -> [DoHeapProfile] #
Show DoHeapProfile #
Methods showsPrec :: Int -> DoHeapProfile -> ShowS # show :: DoHeapProfile -> String # showList :: [DoHeapProfile] -> ShowS #

data ProfFlags #

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 # show :: ProfFlags -> String # showList :: [ProfFlags] -> ShowS #

data DoTrace #

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 #	Since: 4.8.0.0
Methods succ :: DoTrace -> DoTrace # pred :: DoTrace -> DoTrace # toEnum :: Int -> DoTrace # fromEnum :: DoTrace -> Int # enumFrom :: DoTrace -> [DoTrace] # enumFromThen :: DoTrace -> DoTrace -> [DoTrace] # enumFromTo :: DoTrace -> DoTrace -> [DoTrace] # enumFromThenTo :: DoTrace -> DoTrace -> DoTrace -> [DoTrace] #
Show DoTrace #
Methods showsPrec :: Int -> DoTrace -> ShowS # show :: DoTrace -> String # showList :: [DoTrace] -> ShowS #

data TraceFlags #

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)

Instances

Show TraceFlags #
Methods showsPrec :: Int -> TraceFlags -> ShowS # show :: TraceFlags -> String # showList :: [TraceFlags] -> ShowS #

data TickyFlags #

Parameters pertaining to ticky-ticky profiler

Since: 4.8.0.0

Constructors

TickyFlags
Fields showTickyStats :: Bool tickyFile :: Maybe FilePath

Instances

Show TickyFlags #
Methods showsPrec :: Int -> TickyFlags -> ShowS # show :: TickyFlags -> String # showList :: [TickyFlags] -> ShowS #

data ParFlags #

Parameters pertaining to parallelism

Since: 4.8.0.0

Constructors

ParFlags
Fields nCapabilities :: Word32 migrate :: Bool maxLocalSparks :: Word32 parGcEnabled :: Bool parGcGen :: Word32 parGcLoadBalancingEnabled :: Bool parGcLoadBalancingGen :: Word32 parGcNoSyncWithIdle :: Word32 parGcThreads :: Word32 setAffinity :: Bool

Instances

Show ParFlags #
Methods showsPrec :: Int -> ParFlags -> ShowS # show :: ParFlags -> String # showList :: [ParFlags] -> ShowS #

getRTSFlags :: IO RTSFlags #

getGCFlags :: IO GCFlags #

getConcFlags :: IO ConcFlags #

getMiscFlags :: IO MiscFlags #

getDebugFlags :: IO DebugFlags #

getCCFlags :: IO CCFlags #

getProfFlags :: IO ProfFlags #

getTraceFlags :: IO TraceFlags #

getTickyFlags :: IO TickyFlags #

getParFlags :: IO ParFlags #