On Fri, 2006-05-19 at 13:41 -0300, [EMAIL PROTECTED] wrote: > On Thu, 2006-05-18 at 17:39 -0700, Marc Munro wrote: > > > For Postgres 8.2 I would like Veil to be a better citizen and use > only > > what shared memory has been reserved for postgres add-ins. > > How would Postgres ask the add-in how much memory it needs? How would > the add-in know how much has been reserved for it? How would an add-in > know whether it was the only add-in and whether it could take all of > the > allocation?
Postgres would not ask any add-ins how much they need, it would simply
allocate the extra amount defined in a GUC and not make that available
through the normal shared memory allocation mechanism.
The add-in would not "know" how much had been allocated to it, but could
be told through it's own config file. I envisage something like:
in postgresql.conf
# add_in_shmem = 0 # Amount of shared mem to set aside for add-ins
# in KBytes
add_in_shem = 64
in veil.conf
veil_shmem = 32 # Amount of shared memory we can use from
# the postgres add-ins shared memory pool
I think this is better than add-ins simply stealing from, and contending
for, postgres shared memory which is the only real alternative right
now.
__
Marc
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