Re: [squid-users] Squid Processes

Hi Amos,
> On 22.02.2012 03:15, Steve Tatlow wrote:
>> Hi,
>>
>> We are running squid as a transparent proxy, with dansguardian doing the
>> content filtering. All traffic will be coming from localhost and no
>> authentication is required. Can someone tell me how I ensure there are
>> enough squid processes to support a large number of users (maybe 250
>> concurrent users)
>
> None of us can tell you specific numbers. It is dependent on your
> hardware and client traffic.
>
> The thing to be aware of is that measuring in users is meaningless.
> One user can flood the proxy, or some thousands could leave it idle
> waiting for more work. Capacities are reliably measured only in
> requests per second.
>
>
> To get the details you seek measure and get some idea of how many
> requests per second those users make at peak times, and how many the
> whole structure is capable of handling.
> Each Squid series has a theoretical limit which is hardware dependant
> (3.1 can do about 800 req/sec on a dual core 2.2GHz CPU etc). The
> configuration specifics you create and type of requests the clients
> will reduce the capacity limit from there.
>
You mean to say that single squid instance can handle 800 req/sec on a
dual core 2.2 GHz CPU ? Can you elaborate it in details means how many
hdd have you used and is there any specific configuration do you want to
highlight....

As i tested single squid instance with 400-450 req / sec and it is
performing fine.Currently i deployed squid with 175 Mbps bandwidth
load.Now we plan to use it for 400 Mbps so it suppose be 800 or 900 http
req / sec , Does single squid process handle such heavy load or ?

And what kind of h/w specification you suggest for such kind of load ?

Kindly suggest us.

> With content filtering you can usually expect only to reach 30% of
> Squids regular throughput due to the content processing overheads.
>
>
>
>
> 250 users is not large for Squid. Any of the production releases
> should be able to handle that many without causing much of a CPU bump
> on modern hardware. I think you can start with one Squid process and
> expand to more if you find it stressing the machines. More likely you
> will need more DansGuardian proxy processes though, that is where the
> heavy CPU consumption will occur.
>
> Amos
>
Regards,
Ben
Received on Sat Feb 25 2012 - 17:57:15 MST