Runtime statistics

Fields

• gcs :: Word32

  Total number of GCs

• major_gcs :: Word32

  Total number of major (oldest generation) GCs

• allocated_bytes :: Word64

  Total bytes allocated

• max_live_bytes :: Word64

  Maximum live data (including large objects + compact regions) in the heap. Updated after a major GC.

• max_large_objects_bytes :: Word64

  Maximum live data in large objects

• max_compact_bytes :: Word64

  Maximum live data in compact regions

• max_slop_bytes :: Word64

  Maximum slop

• max_mem_in_use_bytes :: Word64

  Maximum memory in use by the RTS

• cumulative_live_bytes :: Word64

  Sum of live bytes across all major GCs. Divided by major_gcs gives the average live data over the lifetime of the program.

• copied_bytes :: Word64

  Sum of copied_bytes across all GCs

• par_copied_bytes :: Word64

  Sum of copied_bytes across all parallel GCs

• cumulative_par_max_copied_bytes :: Word64

  Sum of par_max_copied_bytes across all parallel GCs. Deprecated.

• cumulative_par_balanced_copied_bytes :: Word64

  Sum of par_balanced_copied bytes across all parallel GCs

• init_cpu_ns :: RtsTime

  Total CPU time used by the init phase @since base-4.12.0.0

• init_elapsed_ns :: RtsTime

  Total elapsed time used by the init phase @since base-4.12.0.0

• mutator_cpu_ns :: RtsTime

  Total CPU time used by the mutator

• mutator_elapsed_ns :: RtsTime

  Total elapsed time used by the mutator

• gc_cpu_ns :: RtsTime

  Total CPU time used by the GC

• gc_elapsed_ns :: RtsTime

  Total elapsed time used by the GC

• cpu_ns :: RtsTime

  Total CPU time (at the previous GC)

• elapsed_ns :: RtsTime

  Total elapsed time (at the previous GC)

• nonmoving_gc_sync_cpu_ns :: RtsTime

  The total CPU time used during the post-mark pause phase of the concurrent nonmoving GC.

• nonmoving_gc_sync_elapsed_ns :: RtsTime

  The total time elapsed during the post-mark pause phase of the concurrent nonmoving GC.

• nonmoving_gc_sync_max_elapsed_ns :: RtsTime

  The maximum elapsed length of any post-mark pause phase of the concurrent nonmoving GC.

• nonmoving_gc_cpu_ns :: RtsTime

  The total CPU time used by the nonmoving GC.

• nonmoving_gc_elapsed_ns :: RtsTime

  The total time elapsed during which there is a nonmoving GC active.

• nonmoving_gc_max_elapsed_ns :: RtsTime

  The maximum time elapsed during any nonmoving GC cycle.

• gc :: GCDetails

  Details about the most recent GC

Fields

• gcdetails_gen :: Word32

  The generation number of this GC

• gcdetails_threads :: Word32

  Number of threads used in this GC

• gcdetails_allocated_bytes :: Word64

  Number of bytes allocated since the previous GC

• gcdetails_live_bytes :: Word64

  Total amount of live data in the heap (includes large + compact data). Updated after every GC. Data in uncollected generations (in minor GCs) are considered live.

• gcdetails_large_objects_bytes :: Word64

  Total amount of live data in large objects

• gcdetails_compact_bytes :: Word64

  Total amount of live data in compact regions

• gcdetails_slop_bytes :: Word64

  Total amount of slop (wasted memory)

• gcdetails_mem_in_use_bytes :: Word64

  Total amount of memory in use by the RTS

• gcdetails_copied_bytes :: Word64

  Total amount of data copied during this GC

• gcdetails_par_max_copied_bytes :: Word64

  In parallel GC, the max amount of data copied by any one thread. Deprecated.

• gcdetails_par_balanced_copied_bytes :: Word64

  In parallel GC, the amount of balanced data copied by all threads

• gcdetails_block_fragmentation_bytes :: Word64

  The amount of memory lost due to block fragmentation in bytes. Block fragmentation is the difference between the amount of blocks retained by the RTS and the blocks that are in use. This occurs when megablocks are only sparsely used, eg, when data that cannot be moved retains a megablock.

  @since base-4.18.0.0

• gcdetails_sync_elapsed_ns :: RtsTime

  The time elapsed during synchronisation before GC

• gcdetails_cpu_ns :: RtsTime

  The CPU time used during GC itself

• gcdetails_elapsed_ns :: RtsTime

  The time elapsed during GC itself

• gcdetails_nonmoving_gc_sync_cpu_ns :: RtsTime

  The CPU time used during the post-mark pause phase of the concurrent nonmoving GC.

• gcdetails_nonmoving_gc_sync_elapsed_ns :: RtsTime

  The time elapsed during the post-mark pause phase of the concurrent nonmoving GC.