Re: [CentOS] Measuring memory bandwidth utilization

2016-02-10 Thread Tomasz Kantecki
Benjamin Smith writes: > So far, searching has found intel-cmt-cat-master which isn't supported on our > CPU and oprofile which *sounds* like it does what I want from their website but > I can't seem to get output that, in any way, tells me what the bandwidth usage > is. > >

Re: [CentOS] Measuring memory bandwidth utilization

2016-02-10 Thread Oscar Osta Pueyo
Hello, Try to install collectd and check the metrics for ram. Best regards, El dia 03/02/2016 2:51 a. m., "John R Pierce" va escriure: > On 2/2/2016 5:34 PM, Benjamin Smith wrote: > >> I'd like to know what the cause of a particular DB server's slowdown >> might be. >>

Re: [CentOS] Measuring memory bandwidth utilization

2016-02-10 Thread Chris Murphy
On Tue, Feb 2, 2016 at 7:34 PM, Gordon Messmer wrote: > On 02/02/2016 05:34 PM, Benjamin Smith wrote: >> >> We've ruled out IOPs for the disks (~ 20%) > > > How did you measure that? What filesystem are you using? What is the disk > / array configuration? > Which

[CentOS] Measuring memory bandwidth utilization

2016-02-02 Thread Benjamin Smith
I'd like to know what the cause of a particular DB server's slowdown might be. We've ruled out IOPs for the disks (~ 20%) and raw CPU load (top shows perhaps 1/2 of cores busy, but the system slows to a crawl. We're suspecting that we're simply running out of memory bandwidth but have no way

Re: [CentOS] Measuring memory bandwidth utilization

2016-02-02 Thread John R Pierce
On 2/2/2016 5:34 PM, Benjamin Smith wrote: I'd like to know what the cause of a particular DB server's slowdown might be. We've ruled out IOPs for the disks (~ 20%) and raw CPU load (top shows perhaps 1/2 of cores busy, but the system slows to a crawl. We're suspecting that we're simply running

Re: [CentOS] Measuring memory bandwidth utilization

2016-02-02 Thread Gordon Messmer
On 02/02/2016 05:34 PM, Benjamin Smith wrote: We've ruled out IOPs for the disks (~ 20%) How did you measure that? What filesystem are you using? What is the disk / array configuration? Which database? If you run "iostat -x 2" what does a representative summary look like? and raw CPU

Re: [CentOS] Measuring memory bandwidth utilization

2016-02-02 Thread Stuart Barkley
On Tue, 2 Feb 2016 at 20:34 -, Benjamin Smith wrote: > Any idea? Wild guessing...How old a system? ~5 year old Nehalem? If so try: echo 0 > /proc/sys/vm/zone_reclaim_mode For some memory performance diagnosing try 'sar': sar -B 10 There are lots of other sar options which might