Hi,
I wrote a C program that can be called through postgres via stored procedures. It allows you to change the current postmaster process priority.
Essentially it's intended purpose would be to allow a highly resource intensive postmaster process to run at a lower priority, allowing other postmaster processes more cpu time. For example admin/reporting backend sql's that impact the system. I guess this is the same as renice, however it can be accessed programatically from the postgres box via any client.
The three stored procs are as follows:
get_pid()
get_priority()
set_priority(int) <!--- setting a negative number(high priority) requires root access, typical usage would be to set a lower priority, i.e. of 20.
I would not use this as a alternative to setting up a replication slave for reporting on a large production system.
I have attached the source code, it has already been compiled for redhat Linux ES3. There is a README file to get you started. This was my first attempt at writing a c function for postgres.
<<priority.rar>>
Theo Galanakis
Database Administrator
Lonely Planet Publications
90 Maribyrnong St, Footscray
Melbourne, Vic 3011
Australia
tel +61 3 8379 8000 ext 8395
fax + 61 3 8379 8111
theo_galanakis@lonelyplanet.com.au
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