[clamav-users] About clamav's requirements for system resources

Vladislav Kurz vladislav.kurz at webstep.net
Mon Nov 5 13:38:31 UTC 2018

On 11/3/18 5:23 PM, Matus UHLAR - fantomas wrote:
>> zhuangxiaohui wrote:
>>> I have some servers(Centos6/7). Most of them have 1GB memory, 600M
>>> available.
>>> But also servers with low memory. For example 512M memory, 200M
>>> available.
>>> When I install the "clamav" on server which have 600M available
>>> memory and
>>> start the "clamd" service,
>>> I find that clamd's resident memory is about 500M. But on servers
>>> that have
>>> only 200M of available memory,
>>> the resident memory is about 100M. So I doubt if clamd will work
>>> properly on
>>> these servers, although both
>>> scan and database's updates are normally.
>>> Would you please tell me the lowest clamav's requirements for system
>>> resources especially the memory?
>>> I've searched on your website but got nothing about this :(
> On 02.11.18 15:43, Kris Deugau wrote:
>> I wouldn't run ClamAV with stock signatures on anything less than 1G,
>> and I wouldn't run much else on that machine.  If you're running a
>> very light workload with a dedicated machine, you might get away with
>> 512M.
> I run clamav with 3rd party signatures from Debian package
> clamav-unofficial-sigs everywhere.  In this case, clamav eats nearly 1G of
> RAM.
> I can't tell you how much of it eats clamav without those signatures, but I
> wouldn't run clamav on machines with less than 1GB either.

The unofficial signatures do not eat much extra memory. I think it is
not more than 10% extra, virtually for free. I agree that 1 GB is
minimum, and as you would most probably have a mail server as well, I
recommend 2 GB.

Best regards
        Vladislav Kurz

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