使用ghc RTS分析程序时运行时统计信息的强烈变化

Question

我正试图介绍我的程序。我用

编译了它

stack build --executable-profiling --library-profiling --ghc-options=" -fprof-auto -rtsopts=all -caf-all"

运行程序时，运行时统计信息中存在很大差异：

./example +RTS -s -sstderr

      68,183,336 bytes allocated in the heap
       7,520,984 bytes copied during GC
         573,296 bytes maximum residency (5 sample(s))
          34,728 bytes maximum slop
               3 MB total memory in use (0 MB lost due to fragmentation)

                                 Tot time (elapsed)  Avg pause  Max pause
  Gen  0       127 colls,     0 par    0.020s   0.007s     0.0001s    0.0004s
  Gen  1         5 colls,     0 par    0.000s   0.002s     0.0005s    0.0007s

  TASKS: 4 (1 bound, 3 peak workers (3 total), using -N1)

  SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled)

  INIT    time    0.000s  (  0.002s elapsed)
  MUT     time    0.012s  (  0.026s elapsed)
  GC      time    0.020s  (  0.010s elapsed)
  RP      time    0.000s  (  0.000s elapsed)
  PROF    time    0.000s  (  0.000s elapsed)
  EXIT    time    0.000s  (  0.000s elapsed)
  Total   time    0.032s  (  0.038s elapsed)

Alloc rate    5,681,944,666 bytes per MUT second

Productivity  37.5% of total user, 31.8% of total elapsed

gc_alloc_block_sync: 0
whitehole_spin: 0
gen[0].sync: 0
gen[1].sync: 0

接下来的运行给出了：

$ ./example +RTS -s -sstderr

     68,183,336 bytes allocated in the heap
      7,520,984 bytes copied during GC
        573,296 bytes maximum residency (5 sample(s))
         34,728 bytes maximum slop
              3 MB total memory in use (0 MB lost due to fragmentation)

                                 Tot time (elapsed)  Avg pause  Max pause
  Gen  0       127 colls,     0 par    0.000s   0.007s     0.0001s    0.0002s
  Gen  1         5 colls,     0 par    0.004s   0.002s     0.0004s    0.0006s

  TASKS: 4 (1 bound, 3 peak workers (3 total), using -N1)

  SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled)

  INIT    time    0.000s  (  0.002s elapsed)
  MUT     time    0.024s  (  0.025s elapsed)
  GC      time    0.004s  (  0.009s elapsed)
  RP      time    0.000s  (  0.000s elapsed)
  PROF    time    0.000s  (  0.000s elapsed)
  EXIT    time    0.000s  (  0.000s elapsed)
  Total   time    0.028s  (  0.036s elapsed)

Alloc rate    2,840,972,333 bytes per MUT second

Productivity  85.7% of total user, 67.5% of total elapsed

gc_alloc_block_sync: 0
whitehole_spin: 0
gen[0].sync: 0
gen[1].sync: 0

该程序的调用方式完全相同（当然没有重新编译）;然而Productivity从38％变为85％以上，其他值也完全不同。 此外，字段GC time和total memory use缺失 ...我做错了什么？

非常感谢提前！