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21
votes
3answers
16k views

Linux - How can I see what's waiting for disk IO

I have a server that has a really high load. Nothing is jumping out at me in terms of CPU usage, and it's not swapping. I think it's cause some processes are waiting for disk IO, and I want to see ...
4
votes
1answer
539 views

How is load average related to CPU utilization?

I am facing a load average of > 3 since past 2 days. The CPU utilization is never above 40 % in all cases. Here are some screenshots of Server Density monitoring tool that I use. The process ...
4
votes
7answers
6k views

Acceptable load average

We deployed our new Linux/Exim/Spamassassin mail server on Friday (always a good idea to deploy the day before a long weekend when no admins are around). The load has been hovering around 1.3 on the ...
5
votes
8answers
3k views

Apache gets “clogged” with certain requests

I have a very odd intermittent issue. It occurs on a shared hosting server running CentOS and Apache/2.2.8, serving mostly PHP based websites at a rate of between 10 - 30 requests/sec. 3.5 GB RAM, ...
3
votes
1answer
425 views

Measuring load - %CPU in top is different than %us

When I run TOP on a remote server, I see a very small system utilization (3.8%us). However, for the actual process I am seeing 29.6% of the CPU. Since this server has 8 CPU cores, is the %CPU the ...
17
votes
6answers
13k views

Optimize apache/php/mysql running on VPS for heavy load

Question about optimizing an apache/mysql server on a VPS with 512m of RAM. Under normal load everything runs fast, no connection lag. However when we get our heavy traffic days (50k+ visits) the ...
7
votes
3answers
11k views

Linux disk IO load breakdown, by filesystem path and/or process?

Does anyone have experience with a tool that can provide an indication of disk IO load by filesystem path. I use to 'iostat' utility, frequently, to learn how much disk activity is taking place on a ...
3
votes
3answers
434 views

Is the system load tied directly to CPU usage?

It's a dual-core machine and the load is around 24 but CPU usage is bouncing around from 60-80% and never reaching 100% so how can there be that many processes waiting? I/O is pretty much nill since ...
1
vote
6answers
691 views

How can I figure out which site on my server is getting swamped with traffic?

I'm running a linux server with about 60 websites on it that is crashing under heavy load. Is there an easy way to see which Apache virtual host is getting the most traffic?
5
votes
2answers
345 views

explain server load

I have got a managed server with a AMD Phenom QuadCore 3000 + 8 GB RAM I heard that s.th beetween 1-2 server load is 100% workload. My current results there are: 1.27 | 0.8 | 0.78 and in the overal ...
2
votes
4answers
669 views

Why my server has high load despite mere 1.5% CPU usage

In this is what whm apache status says: Current Time: Sunday, 23-Dec-2012 05:13:40 CST Restart Time: Saturday, 22-Dec-2012 13:38:12 CST Parent Server Generation: 9 Server uptime: 15 hours 35 minutes ...
1
vote
1answer
784 views

Can I use only 2 servers for nginx load balancing?

If I have only 2 servers, can I make each as a backend and also front end? Server 1: master load balancer / backend server1 Server 2: slave load balancer / backend server2 is it possible?
2
votes
4answers
2k views

High load without explanation

I have a very high load on my machine and don't know what is responsible or how to find out. On the machine runs a jboss appserver and mysql. Here is a top from the user at peak time: top - 16:23:01 ...
8
votes
6answers
3k views

How to find the cause for growing server load

I'm having load problems with my server and even though I'm a somewhat experienced Linux admin I'm out of ideas now. The problem is a slowly but steadily increasing load on the server without any ...
8
votes
6answers
2k views

How high can system load go?

Every time I login to my servers via SSH it flashes me a bit of server info. IE IP Address, Swap Usage, Memory Usage, etc. One of the other things it flashes me is System Load. Now most of the time ...
6
votes
6answers
900 views

Site Goes Offline Every Day At Midnight - No One Knows Why

Seems every day a website I manage has been going online and offline between 12a and 12:25a. I have no idea what is causing the issue so I am seeking guidance on where to start. It is a Wordpress ...
5
votes
2answers
618 views

Load Average above 20 for single core vps on debian

OS: Debian 6.0 RAM:3072 M, CPU:single core. top: top - 08:56:43 up 21 days, 12:37, 1 user, load average: 28.38, 22.48, 15.95 Tasks: 8 total, 1 running, 7 sleeping, 0 stopped, 0 zombie ...
3
votes
3answers
110 views

Running a process within a limited amount of resources, in Linux

Is there a way to run a process (e.g. ls, du, find .. etc) within a strictly limited amount of resources (i.e. cpu, memory, I/O) aside from using nice & ionice, as I didn't find them effective ...
3
votes
2answers
3k views

Load Balancing long running TCP connections

I'm trying to research the best way to load balance long running TCP connections for the following scenario: We have multiple servers behind a redundant set of firewalls and clients establish long ...
0
votes
1answer
7k views

Haproxy ACL for balance on URL request

I'm usung Ubuntu with haproxy 1.4.13 version. Its load balancing two subdomains: app1.domain.com app2.domain.com now i want to be able to use ACL to send based on url request to the right ...
2
votes
4answers
486 views

Tracking down load average

The "load average" on a *nix machine is the "average length of the run queue", or in other words, the average number of processes that are doing something (or waiting to do something). While the ...
0
votes
3answers
260 views

Apache stops serving requests when connections increase [duplicate]

Possible Duplicate: Apache performance issue, after “1000 total children” Apache no longer responds to HTTP requests. Not MaxClients issue? The values for MaxClients, ...
0
votes
2answers
245 views

Lots of Apache processes but low pageviews

I have a question that maybe you can help me to answer. When I execute ps -aux from 00:00 to 00:03 I get about 30-40 apache processes but visits in such period of time are only 2 (Google Analytics). ...
0
votes
3answers
226 views

Does this top look healthy to you?

I run a server with the following specs: Intel i7 920 8 GB RAM Linux 2.6.32-25-server #44-Ubuntu 10.04 SMP Fri Sep 17 21:13:39 UTC 2010 x86_64 GNU/Linux 75 Apache processes Low-end hardware RAID-1 ...