[Openmcl-devel] help on diagnosing an OpenMCL crash

[Gary Byers]

> Here is some memory data from a run without "forced" GC'ing:
>
> The lisp-heap-gc-threshold in openmcl is (ccl::lisp-heap-gc-threshold)
> => 16777216.  But watch what happens.  This behavior starts around
> :tick 2977 - openmcl appears to be operating below the gc threshold for
> several ticks, then gc'ing. After ~500 ticks of this it operates below
> the gc threshold until the freebytes bottom out a zero.  Then operates
> for a few more ticks until it finally performs (I think obviously) a gc
> at :tick 3782. From there it is all down hill.  I don't see another gc
> and openmcl operates below the lisp-heap-gc-threshold.

Off the top of my head, I'd say that it sounds like the EGC is on and
working, but it's hard to say what else this means.

>
> :tick 3713 :usedbytes 19136512  :freebytes 1179648 :heap-size(K) 726886
> :tick 3714 :usedbytes 19267584  :freebytes 1048576 :heap-size(K) 727071
> :tick 3715 :usedbytes 19464192  :freebytes 851968 :heap-size(K) 727256
> :tick 3716 :usedbytes 19660800  :freebytes 655360 :heap-size(K) 727442
> :tick 3717 :usedbytes 19857408  :freebytes 458752 :heap-size(K) 727639
> :tick 3718 :usedbytes 20054016  :freebytes 262144 :heap-size(K) 727831
> :tick 3719 :usedbytes 19202048  :freebytes 1114112 :heap-size(K) 728032
> :tick 3720 :usedbytes 19398656  :freebytes 917504 :heap-size(K) 728259
> :tick 3721 :usedbytes 19595264  :freebytes 720896 :heap-size(K) 728446
> :tick 3722 :usedbytes 19791872  :freebytes 524288 :heap-size(K) 728635
> :tick 3723 :usedbytes 19988480  :freebytes 327680 :heap-size(K) 728820
> :tick 3724 :usedbytes 19202048  :freebytes 1114112 :heap-size(K) 729046
> :tick 3725 :usedbytes 19398656  :freebytes 917504 :heap-size(K) 729243
> :tick 3726 :usedbytes 19595264  :freebytes 720896 :heap-size(K) 729424
> :tick 3727 :usedbytes 19791872  :freebytes 524288 :heap-size(K) 729600
> :tick 3728 :usedbytes 19988480  :freebytes 327680 :heap-size(K) 729785
> :tick 3729 :usedbytes 19267584  :freebytes 1048576 :heap-size(K) 729964
> :tick 3730 :usedbytes 19398656  :freebytes 917504 :heap-size(K) 730146
> :tick 3731 :usedbytes 19595264  :freebytes 720896 :heap-size(K) 730364
> :tick 3732 :usedbytes 19791872  :freebytes 524288 :heap-size(K) 730546
> :tick 3733 :usedbytes 19988480  :freebytes 327680 :heap-size(K) 730731
> :tick 3734 :usedbytes 20185088  :freebytes 131072 :heap-size(K) 730913
> :tick 3735 :usedbytes 19333120  :freebytes 983040 :heap-size(K) 731098
> :tick 3736 :usedbytes 19529728  :freebytes 786432 :heap-size(K) 731282
> :tick 3737 :usedbytes 19726336  :freebytes 589824 :heap-size(K) 731463
> :tick 3738 :usedbytes 19922944  :freebytes 393216 :heap-size(K) 731645
> :tick 3739 :usedbytes 20119552  :freebytes 196608 :heap-size(K) 731823
> :tick 3741 :usedbytes 19464192  :freebytes 851968 :heap-size(K) 732190
> :tick 3742 :usedbytes 19660800  :freebytes 655360 :heap-size(K) 732376
> :tick 3743 :usedbytes 19857408  :freebytes 458752 :heap-size(K) 732559
> :tick 3744 :usedbytes 20054016  :freebytes 262144 :heap-size(K) 732738
> :tick 3745 :usedbytes 19333120  :freebytes 983040 :heap-size(K) 732924
> :tick 3746 :usedbytes 19464192  :freebytes 851968 :heap-size(K) 733142
> :tick 3747 :usedbytes 19660800  :freebytes 655360 :heap-size(K) 733320
> :tick 3748 :usedbytes 19857408  :freebytes 458752 :heap-size(K) 733502
> :tick 3749 :usedbytes 20054016  :freebytes 262144 :heap-size(K) 733683
> :tick 3750 :usedbytes 20185088  :freebytes 131072 :heap-size(K) 733860
> :tick 3751 :usedbytes 19398656  :freebytes 917504 :heap-size(K) 734046
> :tick 3752 :usedbytes 19595264  :freebytes 720896 :heap-size(K) 734239
> :tick 3753 :usedbytes 19791872  :freebytes 524288 :heap-size(K) 734426
> :tick 3754 :usedbytes 19988480  :freebytes 327680 :heap-size(K) 734613
> :tick 3755 :usedbytes 20185088  :freebytes 131072 :heap-size(K) 734808
> :tick 3756 :usedbytes 19333120  :freebytes 983040 :heap-size(K) 734997
> :tick 3757 :usedbytes 19595264  :freebytes 720896 :heap-size(K) 735220
> :tick 3758 :usedbytes 19791872  :freebytes 524288 :heap-size(K) 735408
> :tick 3759 :usedbytes 20054016  :freebytes 262144 :heap-size(K) 735653
> :tick 3760 :usedbytes 20250624  :freebytes 65536 :heap-size(K) 735891
> :tick 3761 :usedbytes 19398656  :freebytes 917504 :heap-size(K) 736068
> :tick 3762 :usedbytes 19595264  :freebytes 720896 :heap-size(K) 736246
> :tick 3763 :usedbytes 19791872  :freebytes 524288 :heap-size(K) 736468
> :tick 3764 :usedbytes 19988480  :freebytes 327680 :heap-size(K) 736648
> :tick 3765 :usedbytes 20250624  :freebytes 65536 :heap-size(K) 736860
> :tick 3766 :usedbytes 19398656  :freebytes 917504 :heap-size(K) 737028
> :tick 3767 :usedbytes 19595264  :freebytes 720896 :heap-size(K) 737227
> :tick 3768 :usedbytes 19791872  :freebytes 524288 :heap-size(K) 737392
> :tick 3769 :usedbytes 19922944  :freebytes 393216 :heap-size(K) 737555
> :tick 3770 :usedbytes 20119552  :freebytes 196608 :heap-size(K) 737722
> :tick 3771 :usedbytes 20250624  :freebytes 65536 :heap-size(K) 737883
> :tick 3772 :usedbytes 19398656  :freebytes 917504 :heap-size(K) 738047
> :tick 3773 :usedbytes 19529728  :freebytes 786432 :heap-size(K) 738216
> :tick 3774 :usedbytes 19726336  :freebytes 589824 :heap-size(K) 738385
> :tick 3775 :usedbytes 19922944  :freebytes 393216 :heap-size(K) 738586
> :tick 3776 :usedbytes 20119552  :freebytes 196608 :heap-size(K) 738760
> :tick 3777 :usedbytes 20316160  :freebytes 0 :heap-size(K) 738938
> :tick 3778 :usedbytes 19595264  :freebytes 720896 :heap-size(K) 739187
> :tick 3779 :usedbytes 19791872  :freebytes 524288 :heap-size(K) 739375
> :tick 3780 :usedbytes 19922944  :freebytes 393216 :heap-size(K) 739538
> :tick 3781 :usedbytes 20119552  :freebytes 196608 :heap-size(K) 739697
> :tick 3782 :usedbytes 20250624  :freebytes 65536 :heap-size(K) 739860
> :tick 3783 :usedbytes 12189696  :freebytes 16711680 :heap-size(K) 740025
> :tick 3784 :usedbytes 12386304  :freebytes 16515072 :heap-size(K) 740190
>
> HTH,
> --
> Gary Warren King, Lab Manager
> EKSL East, University of Massachusetts * 413 577 0176

How large is your application, and (without doing so until we figure out
the best way to do so) is it possible to send me a copy ?