Re: [gentoo-user] High load, idle CPU?
Florian Philipp schrieb: Hi list! My virtual server seems to have a problem and I don't know how to find it. Today, while trying to create a new postgresql database I noticed that certain system operations seem to take ages. Normal work on the shell works just fine but for example accessing the postgresql server through psql, restarting tomcat, postgresql or zope all show the very same behavior: Execution freezes, the load average climbs to 1-1.9 and after a few minutes (maybe longer) the task finishes correctly. During all this time, top reports that the CPUs are 100% idle. Other services, for example rsyncd or openvpn, work normally. I also tried restarting the VM. Shutdown took maybe 10 or 15 minutes. Booting was much faster with only a few minutes until all services were up and running. However, it didn't solve the problem. So, my question is: How can I find out what is causing this? Can I somehow trace it? Find out why a process waits? Keep in mind that this is a virtual server. I have no control over the kernel. Oh, and before you ask: The only recent update was rkhunter from 1.2.9-r1 to 1.3.4-r2. I also enabled the chkrootkit weekly cronjob. Thanks in advance! Florian Philipp Thanks everyone for the suggestions! I was just starting to try it out when I noticed that the problem was gone. Maybe some other VM hogged the system or something. signature.asc Description: OpenPGP digital signature
[gentoo-user] High load, idle CPU?
Hi list! My virtual server seems to have a problem and I don't know how to find it. Today, while trying to create a new postgresql database I noticed that certain system operations seem to take ages. Normal work on the shell works just fine but for example accessing the postgresql server through psql, restarting tomcat, postgresql or zope all show the very same behavior: Execution freezes, the load average climbs to 1-1.9 and after a few minutes (maybe longer) the task finishes correctly. During all this time, top reports that the CPUs are 100% idle. Other services, for example rsyncd or openvpn, work normally. I also tried restarting the VM. Shutdown took maybe 10 or 15 minutes. Booting was much faster with only a few minutes until all services were up and running. However, it didn't solve the problem. So, my question is: How can I find out what is causing this? Can I somehow trace it? Find out why a process waits? Keep in mind that this is a virtual server. I have no control over the kernel. Oh, and before you ask: The only recent update was rkhunter from 1.2.9-r1 to 1.3.4-r2. I also enabled the chkrootkit weekly cronjob. Thanks in advance! Florian Philipp signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] High load, idle CPU?
On Fri, Dec 18, 2009 at 1:38 PM, Florian Philipp li...@f_philipp.fastmail.net wrote: Hi list! My virtual server seems to have a problem and I don't know how to find it. Today, while trying to create a new postgresql database I noticed that certain system operations seem to take ages. Normal work on the shell works just fine but for example accessing the postgresql server through psql, restarting tomcat, postgresql or zope all show the very same behavior: Execution freezes, the load average climbs to 1-1.9 and after a few minutes (maybe longer) the task finishes correctly. During all this time, top reports that the CPUs are 100% idle. Other services, for example rsyncd or openvpn, work normally. I also tried restarting the VM. Shutdown took maybe 10 or 15 minutes. Booting was much faster with only a few minutes until all services were up and running. However, it didn't solve the problem. So, my question is: How can I find out what is causing this? Can I somehow trace it? Find out why a process waits? top, iotop, latencytop, powertop
Re: [gentoo-user] High load, idle CPU?
On Fri, Dec 18, 2009 at 2:38 PM, Florian Philipp li...@f_philipp.fastmail.net wrote: Hi list! My virtual server seems to have a problem and I don't know how to find it. Today, while trying to create a new postgresql database I noticed that certain system operations seem to take ages. Normal work on the shell works just fine but for example accessing the postgresql server through psql, restarting tomcat, postgresql or zope all show the very same behavior: Execution freezes, the load average climbs to 1-1.9 and after a few minutes (maybe longer) the task finishes correctly. During all this time, top reports that the CPUs are 100% idle. Other services, for example rsyncd or openvpn, work normally. I also tried restarting the VM. Shutdown took maybe 10 or 15 minutes. Booting was much faster with only a few minutes until all services were up and running. However, it didn't solve the problem. So, my question is: How can I find out what is causing this? Can I somehow trace it? Find out why a process waits? Keep in mind that this is a virtual server. I have no control over the kernel. Oh, and before you ask: The only recent update was rkhunter from 1.2.9-r1 to 1.3.4-r2. I also enabled the chkrootkit weekly cronjob. Thanks in advance! Florian Philipp Well... it'll cause a MASS of output to sift through .. but strace is likely the most powerful tool for the job of simply seeing what a process is calling and when (notably, what call is left waiting to return as the whole process blocks). I'd also take a look at iotop, though the fact that top shows the cpu as idle rather than sitting in iowait makes me doubt that iotop would tell you too much. -- Poison [BLX] Joshua M. Murphy
Re: [gentoo-user] High load, idle CPU?
Ps auxr On 12/18/09, Paul Hartman paul.hartman+gen...@gmail.com wrote: On Fri, Dec 18, 2009 at 1:38 PM, Florian Philipp li...@f_philipp.fastmail.net wrote: Hi list! My virtual server seems to have a problem and I don't know how to find it. Today, while trying to create a new postgresql database I noticed that certain system operations seem to take ages. Normal work on the shell works just fine but for example accessing the postgresql server through psql, restarting tomcat, postgresql or zope all show the very same behavior: Execution freezes, the load average climbs to 1-1.9 and after a few minutes (maybe longer) the task finishes correctly. During all this time, top reports that the CPUs are 100% idle. Other services, for example rsyncd or openvpn, work normally. I also tried restarting the VM. Shutdown took maybe 10 or 15 minutes. Booting was much faster with only a few minutes until all services were up and running. However, it didn't solve the problem. So, my question is: How can I find out what is causing this? Can I somehow trace it? Find out why a process waits? top, iotop, latencytop, powertop -- Sent from my mobile device Kyle
