Re: [PERFORM] High load average in 64-core server , no I/O wait and CPU is idle

2012-05-23 Thread Rajesh Kumar. Mallah
| | Load avg is the number of processes in the running queue, which can | be either waiting to be run or actually running. | | So if you had 100% CPU usage, then you'd most definitely have a load | avg of 64, which is neither good or bad. It may simply mean that | you're using your hardware's ful

Re: [PERFORM] High load average in 64-core server , no I/O wait and CPU is idle

2012-05-23 Thread Claudio Freire
On Thu, May 24, 2012 at 2:26 AM, Rajesh Kumar. Mallah wrote: > | > | Load can easily get to 64 (1 per core) without reaching its capacity. > | So, unless you're experiencing decreased performance I wouldn't think > | much of it. > > I far as i understand , > Load Avg is the average number of proce

Re: [PERFORM] High load average in 64-core server , no I/O wait and CPU is idle

2012-05-23 Thread Rajesh Kumar. Mallah
- "Claudio Freire" wrote: | From: "Claudio Freire" | To: "Rajesh Kumar. Mallah" | Cc: pgsql-performance@postgresql.org | Sent: Thursday, May 24, 2012 9:23:43 AM | Subject: Re: [PERFORM] High load average in 64-core server , no I/O wait and CPU is idle | | On Thu, May 24, 2012 at 12:39 AM,

Re: [PERFORM] Configuration Recommendations

2012-05-23 Thread Mark Kirkwood
On 20/05/12 03:47, Jan Nielsen wrote: In this test, the local mount's buffered reads perform best around RA~10k @ 150MB/sec then starts a steady decline. The SAN mount has a similar but more subtle decline with a maximum around RA~5k @ 80MB/sec but with much greater variance. I was surprised at t

Re: [PERFORM] High load average in 64-core server , no I/O wait and CPU is idle

2012-05-23 Thread Claudio Freire
On Thu, May 24, 2012 at 12:39 AM, Rajesh Kumar. Mallah wrote: > The problem is that  sometimes there are spikes of load avg which > jumps to > 50 very rapidly ( ie from 0.5 to 50  within 10 secs) and > it remains there for sometime and slowly reduces to normal value. > > During such times of high

[PERFORM] High load average in 64-core server , no I/O wait and CPU is idle

2012-05-23 Thread Rajesh Kumar. Mallah
Dear List , We are having scalability issues with a high end hardware The hardware is CPU = 4 * opteron 6272 with 16 cores ie Total = 64 cores. RAM = 128 GB DDR3 Disk = High performance RAID10 with lots of 15K spindles and a working BBU Cache. normally the 1 min load average of the system