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If at all possible, try to adjust the algorithms used by a "disk-I/O intensive" process. If not, look hard at cacheing. Hardware purchases are often called for ... caching controllers, faster drives, solid-state.
If at all possible, try to adjust the algorithms used by a "disk-I/O intensive" process.
That's what I am doing all I need is the metrics to prove it! accton looked a good candidate but no disk stats on linux.
Quote:
Originally Posted by sundialsvcs
purchases are often called for ... caching controllers, faster drives, solid-state.
I am on a virtual host, off-site, so it's easy to mess about, but can change only at weekends when it's off line, so then I have to sit on it for a week.
I've had some success, I split disk to a double SSD to spread the load and it keeps it generally below the red line but still revs a bit high on occasion for my taste. I will up the CPU this weekend see if more timeslices will help.
Then the boss wants things done and the bloody customers!
Well, starting from 2.6.20, Linux Kernel has built-in capability of doing per process I/O accounting. Although, it's not so much easy on other UNIX variants, you can take a look at /proc/PID/io file of a process to determine the I/O activity of that in Linux.
one of the tricks with collectl is to run it for awhile or better yet continously and then play back the data with '--top iokb'. to see all the top options try 'collectl --showtopopt' as there are lots of things you can sort by. you can also play back the overall diskio and/or plot it to correlate the two.
only gottcha is to see process i/o stats you need to run collectl as root OR with the processes's uid otherwise collectl can't read the io stats.
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