(2014/01/29 15:51), Tom Lane wrote:
> KONDO Mitsumasa <kondo.mitsumasa@lab.ntt.co.jp> writes:
>> By the way, latest pg_stat_statement might affect performance in Windows system.
>> Because it uses fflush() system call every creating new entry in
>> pg_stat_statements, and it calls many fread() to warm file cache.
> This statement doesn't seem to have much to do with the patch as
> committed. There are no fflush calls, and no notion of warming the
> file cache either.
Oh, all right.
> We do assume that the OS is smart enough to keep
> a frequently-read file in cache ... is Windows too stupid for that?
I don't know about it. But I think Windows cache feature is stupid.
It seems to always write/read data to/from disk, nevertheless having large memory...
I'd like to know test result on Windows, if we can...
Regards,
--
Mitsumasa KONDO
NTT Open Source Software Center