Re: High Load and Low CPU & Memory



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@xxxxxxxxxx [mailto:redhat-list-
bounces@xxxxxxxxxx] 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@xxxxxxxxxx [mailto:redhat-list-
bounces@xxxxxxxxxx] 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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