SHM_HUGETLB on Linux 2.6.
Hi,
Has anyone tried to use the huge tlb support of the Linux 2.6 kernel?
If you compile the kernel with support for it (CONFIG_HUGETLBFS), you
can call shmget() with a SHM_HUGETLB parameter so that it will use
larger pages.
Has anyone tried to use it? Is it worth trying to set it up?
Kurt
Kurt Roeckx wrote:
Hi,
Has anyone tried to use the huge tlb support of the Linux 2.6 kernel?
If you compile the kernel with support for it (CONFIG_HUGETLBFS), you
can call shmget() with a SHM_HUGETLB parameter so that it will use
larger pages.Has anyone tried to use it? Is it worth trying to set it up?
I tried to apply HugeTlb on shared memory segment, but it does not
provide us statistically-meaningful difference on PostgreSQL.
pgbench gave us the following result, with shared_buffer_size=160mb
and Core2Duo E6400, total system memory=512MB.
Unfortunatelly, any other detailed parameters were lost.
Transaction per sec Average STD
-----------------------------------------------
pgsql-8.2.5 (normal) : 656.6118 17.5006
pgsql-8.2.5 (hugetlb) : 655.3389 20.2623
A similar topic was also posted at Mar 2007.
http://archives.postgresql.org/pgsql-hackers/2007-03/msg00232.php
Regard,
--
OSS Platform Development Division, NEC
KaiGai Kohei <kaigai@ak.jp.nec.com>