Re: #1650: Empty program will sometimes do a major GC, sometimes not - figure out why

[Chicken Trac]

#1650: Empty program will sometimes do a major GC, sometimes not - figure out 
why
---------------------------------------+----------------------
            Reporter:  sjamaan         |      Owner:  sjamaan
                Type:  task            |     Status:  assigned
            Priority:  major           |  Milestone:  5.3
           Component:  core libraries  |    Version:  5.1.0
          Resolution:                  |   Keywords:
Estimated difficulty:  medium          |
---------------------------------------+----------------------

Comment (by megane):

 This randomness can be fixed by changing the line
 {{{srand(C_fix(time(NULL)));}}} in {{{runtime.c}}} to
 - {{{srand(C_fix(42));}}} for no GC, or
 - {{{srand(C_fix(424242));}}} for always GC.

 You can test with this:
 {{{
 for i in `seq 30`; do
     echo "---------------- $i"
     sleep 1
     for j in `seq 5`; do
         ./empty -:g |& grep resized || true
     done
 done

 A run without the "fixes":
 ---------------- 1
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 ---------------- 2
 ---------------- 3
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 ---------------- 4
 ---------------- 5
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 ---------------- 6
 ---------------- 7
 ---------------- 8
 ---------------- 9
 ---------------- 10
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 [GC] resized heap to 3145728 bytes
 }}}

-- 
Ticket URL: <https://bugs.call-cc.org/ticket/1650#comment:8>
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