High Load and Low CPU & Memory
Troy Knabe
knabe at 4j.lane.edu
Mon Mar 2 23:06:35 UTC 2009
Yes. 143 in the r column
vmstat 1
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in cs us
sy id wa st
0 0 0 33337076 615864 4990876 0 0 0 29 5 3
1 1 98 0 0
0 0 0 33337092 615864 4990888 0 0 0 220 1642 6956
3 1 97 0 0
0 0 0 33335844 615864 4990888 0 0 0 1856 1631 7090
4 10 86 0 0
0 0 0 33335604 615864 4990916 0 0 0 64 1824 5811
1 1 98 0 0
1 0 0 33330652 615864 4990916 0 0 0 420 1745 5547
4 1 95 0 0
0 0 0 33332156 615864 4990952 0 0 0 0 1451 7076
2 1 97 0 0
0 0 0 33332420 615864 4990952 0 0 0 1468 1411 6049
2 1 98 0 0
0 0 0 33341000 615864 4990908 0 0 0 596 1879 6981
4 4 92 0 0
0 0 0 33341264 615864 4990908 0 0 0 16 2060 7652
4 1 95 0 0
0 0 0 33342908 615864 4990936 0 0 0 16 1256 6413
3 0 96 0 0
0 0 0 33342924 615864 4990936 0 0 0 672 2263 6586
2 1 98 0 0
0 0 0 33342932 615864 4990960 0 0 0 216 1209 4650
2 0 98 0 0
0 0 0 33342328 615864 4990960 0 0 0 692 1445 5685
3 1 97 0 0
1 0 0 33341096 615864 4991000 0 0 0 0 1571 5542
1 0 98 0 0
143 0 0 33371968 615864 4991000 0 0 0 20 1510 5516
2 5 93 0 0
0 0 0 33380952 615864 4991028 0 0 0 1068 1655
10354 3 6 91 0 0
0 0 0 33382332 615864 4991028 0 0 0 316 1200 6029
1 0 99 0 0
0 0 0 33382364 615864 4990988 0 0 0 652 1374 4964
3 3 95 0 0
0 0 0 33383736 615864 4990988 0 0 0 0 1171 5549
1 0 99 0 0
1 0 0 33382800 615864 4991036 0 0 0 0 1272 6309
4 5 91 0 0
procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
r b swpd free buff cache si so bi bo in cs us
sy id wa st
1 0 0 33382816 615864 4991036 0 0 0 956 1379 5441
2 3 95 0 0
2 0 0 33380948 615864 4991084 0 0 0 232 2410 8702
3 1 96 1 0
0 0 0 33382064 615864 4991084 0 0 0 172 1646 9199
3 2 94 0 0
0 0 0 33381204 615864 4991116 0 0 0 0 1458 6948
3 0 97 0 0
0 0 0 33381592 615864 4991116 0 0 0 0 1453 6442
2 1 97 0 0
0 0 0 33381600 615864 4991140 0 0 0 0 1342 5266
3 1 96 0 0
0 0 0 33382104 615864 4991140 0 0 0 752 1185 4534
1 0 99 0 0
1 0 0 33383112 615864 4991160 0 0 0 60 1188 4629
1 0 99 0 0
0 0 0 33383244 615864 4991160 0 0 0 0 1369 8562
3 1 97 0 0
0 0 0 33382764 615864 4991184 0 0 0 0 1289 4830
1 0 98 0 0
0 0 0 33394136 615864 4991184 0 0 0 0 1343 5320
3 3 94 0 0
0 0 0 33392780 615864 4991228 0 0 0 188 1410 4751
2 1 97 0 0
0 0 0 33392796 615864 4991228 0 0 0 124 1254 4594
0 0 99 0 0
2 0 0 33393648 615864 4991240 0 0 0 0 1690 6993
4 2 94 0 0
1 0 0 33390920 615864 4991240 0 0 0 0 1185 6143
8 17 74 0 0
1 0 0 33387340 615864 4991260 0 0 0 0 1713 8093
12 18 71 0 0
1 0 0 33388100 615864 4991260 0 0 0 280 1453 8055
9 18 73 0 0
1 0 0 33387860 615864 4991280 0 0 0 2092 1541 7539
8 26 66 0 0
1 0 0 33387248 615864 4991280 0 0 0 0 2355 6456
10 17 73 0 0
On Mar 2, 2009, at 2:49 PM, Furnish, Trever G wrote:
>> sysstat is installed, but the spikes seem to be happening so
>> quickly I
>> can't get a read on it. For instance, "top" is running and all of
>> the
>> sudden load average was 20, but cpu is 95% idle.
>
> Hmmm. The RHEL install of sar defaults to collection every 10
> minutes,
> which isn't frequent enough for my tastes. Smoothes out the spikes
> too
> much.
>
> If you let 'vmstat 1' or 'vmstat 5' run, do you see spikes in the
> 'r' or
> 'b' columns?
>
>
>> -----Original Message-----
>> From: redhat-list-bounces at redhat.com [mailto:redhat-list-
>> bounces at redhat.com] On Behalf Of Troy Knabe
>> Sent: Monday, March 02, 2009 4:51 PM
>> To: General Red Hat Linux discussion list
>> Subject: Re: High Load and Low CPU & Memory
>>
>>
>> On Mar 2, 2009, at 1:24 PM, Furnish, Trever G wrote:
>>
>>> Do your iowait percentages go up in top? Perhaps you have an
>>> i/o-related problem.
>>
>> No, %wa is 0%
>>
>>>
>>> Are your network cards running at the same duplex as your connected
>>> switch ports?
>>
>> Yes they are 1000 Full Duplex
>>
>>>
>>> Is kswapd busy (ie your system's thrashing) during the spikes?
>>
>> No.
>>
>>>
>>> You might get useful records by installing the sysstat package and
>>> then
>>> configuring sar to run every minute, then using sar to report on the
>>> collected data.
>>>
>>
>> sysstat is installed, but the spikes seem to be happening so
>> quickly I
>> can't get a read on it. For instance, "top" is running and all of
>> the
>> sudden load average was 20, but cpu is 95% idle.
>>
>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: redhat-list-bounces at redhat.com [mailto:redhat-list-
>>>> bounces at redhat.com] On Behalf Of Troy Knabe
>>>> Sent: Monday, March 02, 2009 4:05 PM
>>>> To: Red Hat
>>>> Subject: High Load and Low CPU & Memory
>>>>
>>>> I have some brand new servers with 2 - Dual Core Xeons 3.33 Ghz and
>>>> 48Gb of RAM. Intermittently they are spiking to high load averages
>>>> 5+
>>>> or sometimes even 10+ and the application (oracle application
>> server)
>>>> becomes unresponsive. We are moving them from 2 - Dual Core
>> Opterons
>>>> 2.4 Ghz and 12GB of RAM, and never experienced this type of
>>>> situation. Can anyone give me some suggestions on where to start
>>>> looking?
>>>>
>>>> I am using Kerberos/LDAP authentication/authorization for the new
>>>> ones, but the ldap servers do not appear to be the issue. The
>> oracle
>>>> user is local to each server.
>>>>
>>>> Thanks
>>>> -Troy
>>>>
>>>>
>>>> --
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