Hi
I am wondering if there is freely available code for a buddy memory
allocator. Specifically I am looking for code that will can break the
blocks across multiple levels and then merge them back together eg.
if the memory pools are 32k, 16k , 8k in size, then
a) if both 8K and 16K are exhausted and application asks for 8k block,
32 K should be broken into 16K fragments and then again into 8K(i.e.
the blocks are broken across multiple levels not just from 16K to 8K)
b) Whenever memory is released the blocks should be merged into 16K and
then back into 32K
Any suggestions will be appreciated.Tha nks
3  10661 
<bh******@gmail .com> wrote in message
news:11******** **************@ i39g2000cwa.goo glegroups.com.. . Hi
I am wondering if there is freely available code for a buddy memory
allocator. Specifically I am looking for code that will can break the
blocks across multiple levels and then merge them back together eg.
if the memory pools are 32k, 16k , 8k in size, then
a) if both 8K and 16K are exhausted and application asks for 8k block,
32 K should be broken into 16K fragments and then again into 8K(i.e.
the blocks are broken across multiple levels not just from 16K to 8K)
b) Whenever memory is released the blocks should be merged into 16K and
then back into 32K
I'm not sure if these will help. Doug Lea and John Walker have both written
respectable memory allocators. Although, recent information indicates
dlmalloc may perform better:
Doug Lea's dlmalloc http://gee.cs.oswego.edu/dl/html/malloc.html
John Walker's BGET http://www.fourmilab.ch/bget/
Rod Pemberton
I am working on this currently (for my physical memory manager), and
when it is done it will be merged into my subversion tree at http://sourceforge.net/projects/xarnos. License will be MIT.
If thats good enough for you would you like an email when it's done? As
this is free software I'm making no guarentees it will ever actually
happen, but I'm getting there slowly :-) .
HTH,
Paul Barker bh******@gmail. com wrote:
I am wondering if there is freely available code for a buddy memory
allocator. Specifically I am looking for code that will can break the
blocks across multiple levels and then merge them back together eg.
if the memory pools are 32k, 16k , 8k in size, then
a) if both 8K and 16K are exhausted and application asks for 8k block,
32 K should be broken into 16K fragments and then again into 8K(i.e.
the blocks are broken across multiple levels not just from 16K to 8K)
b) Whenever memory is released the blocks should be merged into 16K and
then back into 32K
It's not a buddy system, but has most of the characteristics you
specify. Take a look at nmalloc for DJGPP, available at:
<http://cbfalconer.home .att.net/download/nmalloc.zip>
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