On 10/28/2016 08:44 AM, Warner, Gary, Jr wrote:
I've recently been blessed to move one of my databases onto a huge IBM P8
computer. Its a power PC architecture with 20 8-way cores (so postgres SHOULD
believe there are 160 cores available) and 1 TB of RAM.
I've always done my postgres tuning with a copy of "pgtune" which says in the
output:
# WARNING
# this tool not being optimal
# for very high memory systems
So . . . what would I want to do differently based on the fact that I have a "very
high memory system"?
The most obvious is that you are going to want to have (depending on
PostgreSQL version):
* A very high shared_buffers (in newer releases, it is not uncommon to
have many, many GB of)
* Use that work_mem baby. You have 1TB available? Take your average data
set return, and make work_mem at least that.
* IIRC (and this may be old advice), maintenance_work_mem up to 4GB. As
I recall it won't effectively use more than that but I could be wrong.
Lastly but most importantly, test test test.
JD
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