| Posted: 10:55pm 07 Mar 2025 |
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Maybe someone has an explanation? (MMBasic Pico 2 V60002b14)
Clear
Print "Clear."
Print MM.Info(Heap),"Dim test0$"
Dim test0$
Print MM.Info(Heap)
Clear
Print "Clear."
Print MM.Info(Heap),"Dim test0$"
Dim test0$
Print MM.Info(Heap)
Clear
Print
Print "Clear. Heap: ";
Print MM.Info(Heap)
Print
Clear
Print "Clear. Heap: ";MM.Info(Heap)
Clear
Print
Print "Clear. Heap: ";
Print MM.Info(Heap)
Print
Print
Dim test1$ length 1
Print MM.Info(Heap),"Dim test0$ length 1"
test1$="A"
Print
Dim test2$ length 2
Print MM.Info(Heap),"Dim test2$ length 2"
test2$="AB"
Print
Dim test3$ length 3
Print MM.Info(Heap),"Dim test3$ length 3"
test3$="ABC"
Print
Dim test4$ length 4
Print MM.Info(Heap),"Dim test4$ length 4"
test4$="ABCD"
Print
Dim test5$ length 5
Print MM.Info(Heap),"Dim test5$ length 5"
test5$="ABCDE"
Print
Dim test6$ length 6
Print MM.Info(Heap),"Dim test6$ length 6"
Print
Dim test7$ length 7
Print MM.Info(Heap),"Dim test7$ length 7"
Print
Dim test8$ length 8
Print MM.Info(Heap),"Dim test8$ length 8"
Print
Dim test9$ length 9
Print MM.Info(Heap),"Dim test9$ length 9"
End
Output:Clear.
183808 Dim test0$
183552
Clear.
183808 Dim test0$
183552
Clear. Heap: 183808
Clear. Heap: 183552
Clear. Heap: 183808
183808 Dim test0$ length 1
183808 Dim test2$ length 2
183808 Dim test3$ length 3
183808 Dim test4$ length 4
183808 Dim test5$ length 5
183808 Dim test6$ length 6
183808 Dim test7$ length 7
183552 Dim test8$ length 8
183296 Dim test9$ length 9
If I interpret this correctly, then normal strings always "cost" 256 bytes of heap memory. While strings dimensioned with LENGTH <8 appear to be 'free'  , above LENGTH 7, however, they cost the full price = 256 bytes.
This part almost surprises me more. I would not have expected the heap to be affected by the position of the print output.
Clear
Print
Print "Clear. Heap: ";
Print MM.Info(Heap)
Print
Clear
Print "Clear. Heap: ";MM.Info(Heap)
Clear
Print
Print "Clear. Heap: ";
Print MM.Info(Heap)
Print
Output:
Clear. Heap: 183808
Clear. Heap: 183552
Clear. Heap: 183808
Michael
causality ≠ correlation ≠ coincidence |
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