On 4/21/16 11:07 , Gabriele Bulfon wrote: > Hi, > I had a strange situation on a server starting to respond very slow on almost > any deamon (tomcat/apache/ssh/cyrus). > While prstat/top did not show any high cpu usage (under 5%) and prstat -Z > didn't show any very high memory usage, and > swap look there unused...I tried running netstat -a to see how many sockets > where there serving. > The result was a very fast output of all the normal sockets, and then hanging > for 10-30 seconds before the output of active UNIX domain sockets. > I repeated the command some times, but didn't think about saving the output > somewhere, so I don't know what the domain sockets state was (which files, > where). > I can say the machine runs amavis / spamd / lmtpd /saslauthd / cyrus / > postfix / apache / tomcat / postgres for more than 600 users. > Is there anything I should look deeper about the domain socket usage? Is it > possible that they were so much busy slowing down > every socket (even ssh took 1 to 2 minutes to take me to the bash).
In general, you should use the -n option to netstat whenever you're debugging so you're not generating a lot of dns resolutions. But when you're looking at that kind of thing, you should start with your CPU microstates for processes (usually the -mL options to prstat) and tools like mpstat and vmstat. Robert ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
