I've installed ClamAV 0.98.5 using "brew" on OSX (Yosemite) and I schedule
a daily freshclam followed by clamscan using Jenkins-CI.

I've noticed a worrying trend in the scan times over the past couple of
weeks:

June 20

----------- SCAN SUMMARY -----------
Known viruses: 3849353
Engine version: 0.98.5
Scanned directories: 199102
Scanned files: 1559603
Infected files: 0
Data scanned: 69081.70 MB
Data read: 191713.22 MB (ratio 0.36:1)
Time: 27714.616 sec (461 m 54 s)
Finished: SUCCESS


July 8

----------- SCAN SUMMARY -----------
Known viruses: 3885885
Engine version: 0.98.5
Scanned directories: 199602
Scanned files: 2465935
Infected files: 0
Data scanned: 72968.66 MB
Data read: 206279.09 MB (ratio 0.35:1)
Time: 54119.966 sec (901 m 59 s)


so that's a ~100% increase in time for a ~10% increase in data
read/scanned. The intervening times look pretty much linear between
these two points. The full graph is available here:

https://www.dropbox.com/s/hyxi9bmpy5uzlsp/ClamAV.png?dl=0


At this rate I won't be able to do daily scans in another 2 weeks or
so - they'll take longer than 24 hours.


Will an upgrade to 0.98.7 (currently unsupported by "brew") solve this
or am I doing something wrong?


Thanks,

Chris
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