Re: BUG #5767: Memory Leak

On 11/25/2010 12:28 PM, Darryl Pye wrote:

> PostgreSQL version: 9.01

32-bit or 64-bit ?

> A single postgres process appears to be constantly growing in memory usage
> until it reaches 100% of memory on the machine.

How are you watching it? Task manager?

You need to use something that can differentiate between the shared
memory block and the per-task private memory. Process Explorer can do
that, IIRC.

> I have rebooted the server and the problem goes away but then a single
> postgres.exe process continues to eat memory until it uses all available
> ram then i have to restart again.

Are you able to identify which postgres process it is? Is it shown in
"SELECT * from pg_stat_activity;" ?

Is it one of the postgres processes that appears when PostgreSQL is
first started, before any connections are made to the database server?

Are you sure you're not looking at totals for all postgres.exe instances?

> I have made the following configuration changes from default
> shared_buffers = 1GB
> wal_buffers = 1MB
> effective_cache_size = 2GB

With those settings, you should expect PostgreSQL to appear to use a bit
over 1GB of RAM per postgres.exe, though the vast majority of that 1GB
should be shared between all the postgres.exe processes so the total
memory of all postgres.exe instances will appear to vastly exceed your
machine's RAM. That's just because of the bad accounting for shared
memory in most OSes, including windows, and doesn't affect how it runs.

--
Craig Ringer