I get: 
>c:\progs\perl580\bin\perl test.pl
SIZE : 268

>c:\progs\perl588\bin\perl test.pl
SIZE : 268

>c:\progs\perl5100\bin\perl test.pl
SIZE : 312

[download]

4.4 bytes per element.

Or I loop 100 times: 

>c:\progs\perl580\bin\perl test.pl
SIZE : 2156

>c:\progs\perl588\bin\perl test.pl
SIZE : 2156

>c:\progs\perl5100\bin\perl test.pl
SIZE : 2200

[download]

Still only 44 extra bytes. So they're tied to the array, not the elements. Adding Devel::Peek to the mix: 

>c:\progs\perl588\bin\perl test.pl
SIZE : 2156
SV = RV(0x185d34c) at 0x1820714
  REFCNT = 1
  FLAGS = (TEMP,ROK)
  RV = 0x236da4
  SV = PVAV(0x23bfcc) at 0x236da4
    REFCNT = 2
    FLAGS = (PADBUSY,PADMY)
    IV = 0
    NV = 0
    ARRAY = 0x18799ac
    FILL = 99
    MAX = 123
    ARYLEN = 0x0
    FLAGS = (REAL)

>c:\progs\perl5100\bin\perl test.pl
SIZE : 2200
SV = RV(0x1950668) at 0x195065c
  REFCNT = 1
  FLAGS = (TEMP,ROK)
  RV = 0x1829944
  SV = PVAV(0x23a120) at 0x1829944
    REFCNT = 2
    FLAGS = (PADMY,RMG)
    MAGIC = 0x1823f0c
      MG_VIRTUAL = &PL_vtbl_arylen_p
      MG_TYPE = PERL_MAGIC_arylen_p(@)
      MG_FLAGS = 0x02
        REFCOUNTED
    ARRAY = 0x183502c
    FILL = 99
    MAX = 123
    ARYLEN = 0x0
    FLAGS = (REAL)

[download]

I wonder why the array comes with magic attached!

Update: Added Devel::Peek dump.

In reply to Re: perl5.10 Devel::Size behaviour changed? by ikegami
in thread perl5.10 Devel::Size behaviour changed? by sang1986

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