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Solve a VMWare/Parallels and Sophos Anti-virus slowdown
Authored by: jelockwood on Mar 20, '09 08:52:35AM

We have used Sophos for many years, several years ago we had a similar problem when using Virtual PC. When the disk image grew bigger than 4GB the performance fell off a cliff. At that time Sophos did fix the problem (I seem to recall by changing the amount of memory they allocated).

However I am seeing a similar problem currently with Disk Utility. Even under normal circumstances, Disk Utility under Mac OS X 10.5 (Leopard) takes much longer than Tiger (it is working in a different manner). Under Leopard, there appear to be two main parts to the Repair Permissions process, the first it to read a database (presumably defining what the permissions should be), and the second is to check and if needed adjust the permissions on all the listed files.

When doing the first part (reading the database), this is done by a process called installdb and it uses a fair amount of CPU but Sophos (InterCheck) uses hardly any, however when it moves on to the second part which is done by a process called repair_packages then at that point the InterCheck process from Sophos goes from almost zero to 80-90% CPU utilisation. As a result the amount of time that the Repair Permissions process will need increase by almost 100 times!

It is ridiculous that a simple virus scan should use so much CPU processing. I have reported this to Sophos and I am going to continue trying to persue them over this.

Currently I am using Sophos 4.9.20.



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Solve a VMWare/Parallels and Sophos Anti-virus slowdown
Authored by: gerritdewitt on Mar 23, '09 10:39:01AM

Yes, I can confirm that the problem persists with 4.9.20.

--Gerrit



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