base-4.16.0.0: Basic libraries
Safe HaskellTrustworthy
LanguageHaskell2010

GHC.Stats

Description

This module provides access to internal garbage collection and memory usage statistics. These statistics are not available unless a program is run with the -T RTS flag.

This module is GHC-only and should not be considered portable.

Since: base-4.5.0.0

Synopsis

Runtime statistics

data RTSStats Source #

Statistics about runtime activity since the start of the program. This is a mirror of the C struct RTSStats in RtsAPI.h

Since: base-4.10.0.0

Constructors

RTSStats 

Fields

Instances

Instances details
Read RTSStats #

Since: base-4.10.0.0

Instance details

Defined in GHC.Stats

Show RTSStats #

Since: base-4.10.0.0

Instance details

Defined in GHC.Stats

Generic RTSStats # 
Instance details

Defined in GHC.Stats

Associated Types

type Rep RTSStats :: Type -> Type Source #

type Rep RTSStats #

Since: base-4.15.0.0

Instance details

Defined in GHC.Stats

type Rep RTSStats = D1 ('MetaData "RTSStats" "GHC.Stats" "base" 'False) (C1 ('MetaCons "RTSStats" 'PrefixI 'True) ((((S1 ('MetaSel ('Just "gcs") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word32) :*: (S1 ('MetaSel ('Just "major_gcs") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word32) :*: S1 ('MetaSel ('Just "allocated_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64))) :*: ((S1 ('MetaSel ('Just "max_live_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "max_large_objects_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64)) :*: (S1 ('MetaSel ('Just "max_compact_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "max_slop_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64)))) :*: ((S1 ('MetaSel ('Just "max_mem_in_use_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: (S1 ('MetaSel ('Just "cumulative_live_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "copied_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64))) :*: ((S1 ('MetaSel ('Just "par_copied_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "cumulative_par_max_copied_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64)) :*: (S1 ('MetaSel ('Just "cumulative_par_balanced_copied_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "init_cpu_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime))))) :*: (((S1 ('MetaSel ('Just "init_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: (S1 ('MetaSel ('Just "mutator_cpu_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: S1 ('MetaSel ('Just "mutator_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime))) :*: ((S1 ('MetaSel ('Just "gc_cpu_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: S1 ('MetaSel ('Just "gc_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime)) :*: (S1 ('MetaSel ('Just "cpu_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: S1 ('MetaSel ('Just "elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime)))) :*: ((S1 ('MetaSel ('Just "nonmoving_gc_sync_cpu_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: (S1 ('MetaSel ('Just "nonmoving_gc_sync_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: S1 ('MetaSel ('Just "nonmoving_gc_sync_max_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime))) :*: ((S1 ('MetaSel ('Just "nonmoving_gc_cpu_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: S1 ('MetaSel ('Just "nonmoving_gc_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime)) :*: (S1 ('MetaSel ('Just "nonmoving_gc_max_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: S1 ('MetaSel ('Just "gc") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 GCDetails)))))))

data GCDetails Source #

Statistics about a single GC. This is a mirror of the C struct GCDetails in RtsAPI.h, with the field prefixed with gc_ to avoid collisions with RTSStats.

Constructors

GCDetails 

Fields

Instances

Instances details
Read GCDetails #

Since: base-4.10.0.0

Instance details

Defined in GHC.Stats

Show GCDetails #

Since: base-4.10.0.0

Instance details

Defined in GHC.Stats

Generic GCDetails # 
Instance details

Defined in GHC.Stats

Associated Types

type Rep GCDetails :: Type -> Type Source #

type Rep GCDetails #

Since: base-4.15.0.0

Instance details

Defined in GHC.Stats

type Rep GCDetails = D1 ('MetaData "GCDetails" "GHC.Stats" "base" 'False) (C1 ('MetaCons "GCDetails" 'PrefixI 'True) ((((S1 ('MetaSel ('Just "gcdetails_gen") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word32) :*: S1 ('MetaSel ('Just "gcdetails_threads") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word32)) :*: (S1 ('MetaSel ('Just "gcdetails_allocated_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "gcdetails_live_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64))) :*: ((S1 ('MetaSel ('Just "gcdetails_large_objects_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "gcdetails_compact_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64)) :*: (S1 ('MetaSel ('Just "gcdetails_slop_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "gcdetails_mem_in_use_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64)))) :*: (((S1 ('MetaSel ('Just "gcdetails_copied_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "gcdetails_par_max_copied_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64)) :*: (S1 ('MetaSel ('Just "gcdetails_par_balanced_copied_bytes") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Word64) :*: S1 ('MetaSel ('Just "gcdetails_sync_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime))) :*: ((S1 ('MetaSel ('Just "gcdetails_cpu_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: S1 ('MetaSel ('Just "gcdetails_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime)) :*: (S1 ('MetaSel ('Just "gcdetails_nonmoving_gc_sync_cpu_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime) :*: S1 ('MetaSel ('Just "gcdetails_nonmoving_gc_sync_elapsed_ns") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RtsTime))))))

type RtsTime = Int64 Source #

Time values from the RTS, using a fixed resolution of nanoseconds.

getRTSStats :: IO RTSStats Source #

Get current runtime system statistics.

Since: base-4.10.0.0

getRTSStatsEnabled :: IO Bool Source #

Returns whether GC stats have been enabled (with +RTS -T, for example).

Since: base-4.10.0.0