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Re: [MacPerl] DB_File and odd behaivor
At 09:16 +0200 98/06/16, Matthias Ulrich Neeracher wrote:
> Hmm, in that case, I think I know what's wrong with DB_File: It won't work
> reliably on file systems where the logical block size is not a power of
>2.
> That the size, written as a binary number, contains exactly one "1".
Herewith the HFS (minus? :-) disk block allocation table for disk volume
sizes from 32 MB to 1 GB (if yours is bigger, I trust you can work it
out...)
If I understand Matthias arightly, the rows with nothing in the "power of 2"
column will be problematic (I didn't compute the ones where the exponent
has a fraction)
volume alloc. block power of 2
size (MB) size
32 512 2^9
64 1024 2^10
96 1536 -
128 2048 2^11
160 2560 -
192 3072 -
224 3584 -
256 4096 2^12
288 4608 -
320 5120 -
352 5632 -
384 6144 -
416 6656 -
448 7168 -
480 7680 -
512 8192 2^13
544 8704 -
576 9216 -
608 9728 -
640 10240 -
672 10752 -
704 11264 -
736 11776 -
768 12288 -
800 12800 -
832 13312 -
864 13824 -
896 14336 -
928 14848 -
960 15360 -
992 15872 -
1024 16384 2^14
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