[Pvfs2-developers] patch: alternate AIO implementation

[Rob Ross]

I think that lio_listio() is supposed to do operations in-order, so 
Phil's implementation, while perfect for us, doesn't behave as it should 
for POSIX. This is probably also why the glibc code only posts one 
operation on a FD at a time.

Rob

Phil Carns wrote:
> Sam Lang wrote:

[snip]

>> Does it make sense to  factor that out so that it could be used as a 
>> separate implementation  for others (LD_PRELOAD=libfastaio.so :-))?  I 
>> guess the only  advantage pvfs would gain from that would be the 
>> performance  comparisons of the two different lio_listio 
>> implementations from all  the aio tests out already out there.  A 
>> disadvantage might be that  you can't switch between one and the other 
>> dynamically at runtime.
> 
> I would imagine this is possible, but probably more work than I have 
> time to tinker with :)  You could probably even play some trick to make 
> it controllable at runtime (looking at the value of a global variable if 
> defined, or maybe latching hold of the aio_init() function to control it).