The Computer Activity databases are a collection of computer systems
activity measures. The data was collected from a Sun Sparcstation 20/712 with
128 Mbytes of memory running in a multi-user university department. Users would
typically be doing a large variety of tasks ranging from accessing the
internet, editing files or running very cpu-bound programs. The data was
collected continuously on two separate occasions. On both occassions, system
activity was gathered every 5 seconds. The final dataset is taken from both
occasions with equal numbers of observations coming from each collection
epoch.
System measures used:
1. lread - Reads (transfers per second ) between system memory and user
memory.
2. lwrite - writes (transfers per second) between system memory
and user memory.
3. scall - Number of system calls of all types per
second.
4. sread - Number of system read calls per second.
5.
swrite - Number of system write calls per second .
6. fork - Number of
system fork calls per second.
7. exec - Number of system exec calls per
second.
8. rchar - Number of characters transferred per second by system
read calls.
9. wchar - Number of characters transfreed per second by
system write calls.
10. pgout - Number of page out requests per
second.
11. ppgout - Number of pages, paged out per second.
12.
pgfree - Number of pages per second placed on the free list.
13. pgscan -
Number of pages checked if they can be freed per second.
14. atch - Number
of page attaches (satisfying a page fault by reclaiming a page in memory) per
second.
15. pgin - Number of page-in requests per second.
16. ppgin -
Number of pages paged in per second.
17. pflt - Number of page faults
caused by protection errors (copy-on-writes).
18. vflt - Number of page
faults caused by address translation.
19. runqsz - Process run queue
size.
20. freemem - Number of memory pages available to user
processes.
21. freeswap - Number of disk blocks available for page
swapping.
22. usr - Portion of time (%) that cpus run in user mode.
23. sys - Portion of time (%) that cpus run in system mode.
24. wio -
Portion of time (%) that cpus are idle waiting for block IO.
25. idle -
Portion of time (%) that cpus are otherwise idle.
The two different regression tasks obtained from these databases
are:
CompAct
Predict usr, the portion of time that cpus run in
user mode from all attributes 1-21.
CompAct(s)
Predict usr using a restricted number (excluding the
paging information (10-18)