I was recently running some tests with huge page tables. I ran them on two
different architectures: x86 and PPC64.

I saw some discussion going on over here so thought of sharing.
I was using 3 Cores, 8GB RAM, 2 LUN for filesystem (1 for dbfiles and 1 for
logfiles) for these tests...

I had dedicated
(shared_buffers + 400bytes*max_connection + wal_buffers)/Pagesize [from
/proc/meminfo] for huge pages. I kept some overcommit_hugepages to be used
by work_mem (max_connection*work_mem)/Pagesize

x86_64 bit gave me a benefit of 2-5% for TPC-C workload( I scaled from 1 to
100 users). PPC64 which uses 16MB and 64MB did not give me any benefits in
fact the performance degraded as the concurrency of system increased.

my 2 cents, hope it helps.

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