Re: [PERFORM] Ever Increasing IOWAIT

2007-05-20 Thread Ralph Mason
"Ralph Mason" <[EMAIL PROTECTED]> writes: > Ralph Mason wrote: >> We have a database running on a 4 processor machine. As time goes by >> the IO gets worse and worse peeking at about 200% as the machine loads up. >> >> The weird thing is that if we restart postgres it's fine for hours but >> ov

Re: [PERFORM] Ever Increasing IOWAIT

2007-05-20 Thread Tom Lane
"Ralph Mason" <[EMAIL PROTECTED]> writes: > Ralph Mason wrote: >> We have a database running on a 4 processor machine. As time goes by >> the IO gets worse and worse peeking at about 200% as the machine loads up. >> >> The weird thing is that if we restart postgres it's fine for hours but >> ov

Re: [PERFORM] Ever Increasing IOWAIT

2007-05-20 Thread Ralph Mason
>You're not swapping are you? One explanation could be that PG is >configured to think it has access to a little more memory than the box >can really provide, which forces it to swap once it's been running for >long enough to fill up its shared buffers or after a certain number of >concurrent co

Re: [PERFORM] Ever Increasing IOWAIT

2007-05-20 Thread Ralph Mason
Ralph Mason wrote: > We have a database running on a 4 processor machine. As time goes by > the IO gets worse and worse peeking at about 200% as the machine loads up. > > The weird thing is that if we restart postgres it’s fine for hours but > over time it goes bad again. > > (CPU usage graph

Re: [PERFORM] Ever Increasing IOWAIT

2007-05-18 Thread Mark Lewis
You're not swapping are you? One explanation could be that PG is configured to think it has access to a little more memory than the box can really provide, which forces it to swap once it's been running for long enough to fill up its shared buffers or after a certain number of concurrent connectio

Re: [PERFORM] Ever Increasing IOWAIT

2007-05-18 Thread Richard Huxton
Ralph Mason wrote: We have a database running on a 4 processor machine. As time goes by the IO gets worse and worse peeking at about 200% as the machine loads up. The weird thing is that if we restart postgres it’s fine for hours but over time it goes bad again. (CPU usage graph here HYPERLINK

Re: [PERFORM] Ever Increasing IOWAIT

2007-05-17 Thread Ralph Mason
Hi Josh - thanks for thoughts. > > This is Postgres 8.1.4 64bit. >1. Upgrade to 8.1.9. There is a bug with autovac that is fixed that is >pretty important. We don't use pg_autovac - we have our own process that runs very often vacuuming tables that are dirty. It works well and vacuums when ac

Re: [PERFORM] Ever Increasing IOWAIT

2007-05-17 Thread Joshua D. Drake
Ralph Mason wrote: We have a database running on a 4 processor machine. As time goes by the IO gets worse and worse peeking at about 200% as the machine loads up. The weird thing is that if we restart postgres it’s fine for hours but over time it goes bad again. (CPU usage graph here

[PERFORM] Ever Increasing IOWAIT

2007-05-17 Thread Ralph Mason
We have a database running on a 4 processor machine. As time goes by the IO gets worse and worse peeking at about 200% as the machine loads up. The weird thing is that if we restart postgres it’s fine for hours but over time it goes bad again. (CPU usage graph here HYPERLINK "http://www.fl