1
vote
0answers
139 views

How to find which cron job is hogging CPU?

I am getting a spike in network utilisation on my ec2 micro instance at a specific time each day. Using atop, I found that it is the daily cron that causes the problem: PID RDDSK WRDSK WCANCL DSK ...
1
vote
1answer
105 views

How to find cause of EC2 micro instance regular read/write surge?

Every day without fail, sometime between 06:20 and 07:00 UTC, I get two email alerts from EC2 warning me that my "High VolumeWriteBytes" and "High VolumeReadBytes" have exceeded my set threshold. I ...
1
vote
3answers
1k views

No apparent reason for high load average

We have several web servers running on Amazon (ec2) c1.xlarge, over Amazon AMI. The servers are duplicates of each other, running the exact same hardware and software. Each server spec is: 7 GB of ...
1
vote
2answers
399 views

No clue for high load average on top

We have several machines on Amazon (ec2) of the type c1.xlarge with 16 cpus, running the Amazon AMI. Details on the machine: 7 GB of memory 20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute ...
3
votes
2answers
2k views

Why does ec2 monitoring show 100% cpu and top only 20%?

I am running an python script on an ec2 instance that inserts rows in an database on another instance. In ec2's monitoring I saw a 100% cpu utilization, whereas top only shows 20% for the python ...
5
votes
1answer
318 views

Mysterious swap usage on EC2

We're in the middle of a project to move our infrastructure from a co-lo situation into Amazon EC2 and we've noticed some weird memory characteristics of the processes in our setup. Without going into ...
2
votes
1answer
524 views

top, w, ps showing wrong CPU times

I've spotted this trait recently on some of my Ubuntu servers (10.04.2) on Amazon EC2 (not noticed this on any physical boxes), and can't quite comprehend how it's getting these figures. They can't be ...
2
votes
1answer
216 views

EC2 instance CPU in thousands

I started a new instance (c1.medium) and top show some crazy cpu usage PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 9561 ubuntu 20 0 84888 ...
11
votes
3answers
6k views

What does %st mean in top?

Here is an example from my top: Cpu(s): 6.0%us, 3.0%sy, 0.0%ni, 78.7%id, 0.0%wa, 0.0%hi, 0.3%si, 12.0%st I am trying to figure out the significance of the %st field. I read that it means ...
3
votes
2answers
7k views

is CPU actually occupied during iowait (%wa in top) on Linux / EC2?

On an 8-way Amazon EC2 instance (running Linux 2.6.21) with 8 EBS volumes and a lot of disk traffic, we see high %wa in top (30-40%), and high load average (8-9). My understanding is that processes ...
2
votes
1answer
1k views

What could be causing load spikes on this EC2 instance?

I have an Amazon EC2 instance (c1.medium, ami-ed46a784) that experiences short spikes in load average every 32 hours or so. The average load is normally around 0.15 but rises to 3+ for about 15 ...