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location Raleigh, NC
age 35
visits member for 5 years
seen Jul 16 at 19:36

Developer and system architect.


Jul
8
comment Growing OS cache in RAM causing high system CPU usage
Also, numactl --hardware reports just a single node "0", so I doubt it's NUMA memory balancing problems.
Jul
8
comment Growing OS cache in RAM causing high system CPU usage
Thanks for the leads, although I'm not sure they are panning out. I updated the question with the fact that it's a pretty standard Apache/PHP application. And I'm not sure about the zone reclaim problem because it seems that NUMA is off (grep -i 'numa' /var/log/dmesg gives [0.000000] NUMA turned off. It's a virtual machine running on AWS if that helps.
Jul
8
comment Growing OS cache in RAM causing high system CPU usage
I don't believe it's a zone reload problem. cat /proc/sys/vm/zone_reclaim_mode shows 0. Would it still make sense to capture the output of /proc/zoneinfo during a problem?
Jul
7
comment Growing OS cache in RAM causing high system CPU usage
Answers above. But as for the JVM GC issue, wouldn't that show up as a similar pattern with actual memory used? Unfortunately my monitoring system doesn't make it easy to see, but the actual application memory is the difference between the top 2 lines, which is pretty steady. The drastic cliffs are caused by the OS-cache, not the application memory.
Jul
7
revised Growing OS cache in RAM causing high system CPU usage
added 127 characters in body
Jul
7
asked Growing OS cache in RAM causing high system CPU usage
May
25
awarded  Teacher
Apr
11
accepted Send an email from exim to another SMTP server strippping the local envelope
Apr
10
answered Send an email from exim to another SMTP server strippping the local envelope
Apr
9
revised Send an email from exim to another SMTP server strippping the local envelope
added 198 characters in body
Apr
9
comment Send an email from exim to another SMTP server strippping the local envelope
Yes, it's going to the right smarthost. We see that in the logs on both the satellite and the smarthost and in the received lines.
Apr
9
asked Send an email from exim to another SMTP server strippping the local envelope
Apr
5
comment How do I disable MEDIUM and WEAK/LOW strength ciphers in Apache + mod_ssl?
Marking your own answer as correct when there were correct answers to your question is really bad form.
Oct
14
awarded  Scholar
Oct
14
accepted MySQL's innodb_file_per_table and “too many tables”
Oct
14
awarded  Editor
Oct
14
revised Restarting Apache hangs SSH session
added 5 characters in body
Oct
14
asked Restarting Apache hangs SSH session
Jul
30
awarded  Student
Jul
30
asked MySQL's innodb_file_per_table and “too many tables”