IBM java: Turning on SMP seems more and more likely the key
billfink at mindspring.com
Wed May 29 10:54:28 EST 2002
On Tue May 28 2002, Graham Leggett wrote:
> James Gunning wrote:
> > Have just verified that toggling SMP *on* is the critical
> > switch to get the IBM java to go.
> Had the same result here: SMP kernel + java = works.
> Trouble is the SMP kernel is noticably slower than the non SMP kernel on
> non SMP systems.
My best guess is that the bug is somewhere in /usr/src/linux/mm/slab.c
since that is the only part of the MM code that's dependent on CONFIG_SMP.
One difference I see is that the SMP code uses kmem_cache_alloc_batch
which is a real function, whereas the non-SMP code uses kmem_cache_alloc_one
which is a macro. Also the SMP code writes something to the /proc file
system while the non-SMP code does not. But I don't see anything obviously
wrong, although I'm certainly no expert in this area.
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