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16
votes
4answers
31k views

System process (PID 4) constantly accessing the hard disk

Recently I noticed some of our machines are getting sluggish, mainly after boot-up. Using the Resource Monitor I detected excessive disk access from the system process with PID 4. Following some tips, ...
6
votes
2answers
3k views

Can you set a minimum linux disk buffer size?

I have a rather old Linux machine with 2GB of ram, no swap, and it's working very well, with the system using every unused piece of memory for caching with great effect. However, when I'm close to ...
0
votes
3answers
287 views

How do I figure out why my (Ubuntu 8.04) server is thrashing and becoming unresponsive?

I have a server running Ubuntu 8.04. It's a web server (mysql/php/apache2) and mail server (dovecot/postfix/spam assassin). Normally, memory usage is nominal and everything runs smoothly. Every once ...
8
votes
5answers
5k views

How do I measure disk thrashing on linux?

How do I accurately observe and measure the amount of virtual memory utilization and activity on Linux? I know there is vmstat, but how do I interpret the results? Or, what is better?