[squid-users] Why Squid on CentOS is faster than Debian ?

[David Touzeau]

Le 31/03/2019 à 05:50, Amos Jeffries a écrit :
> On 31/03/19 3:41 am, David Touzeau wrote:
>> On 30.03.19 10:22, David Touzeau wrote:
>>
>>>> Did you have perform squid stress on Debian against CentOS ?
>>>>
>>>> I have installed:
>>>>
>>>> * Debian 9 net install + Squid compiled
>>>> * CentOS 7 minimal  + Squid compiled
>>>>
>>>> Same version, same compilation parameters, same Squid settings.
>>>> It seems that Squid on CentOS is 10 times faster than squid on Debian
>>> faster in what? Response time? number of parallel connections?
>>> single or multiple connection data transfers?
>>> HTTP or HTTPS?
>>>
>>>> What are kernel differences that made this huge performance changes?
>>> no kernel differences should cause 10x speed difference.
>>>
> If you still have the config.log files from the build you may be able to
> track down something being detected (or not) in one of the builds.
>
> The -march=native or -O level options for compile would be the first
> place I look for a major difference like that. Either on Squid or on one
> of the system libraries it uses. The *FLAGS summary at the end of the
> build can be a good starting point for comparison.
>
> Compiler version can also have an effect as newer compilers use more
> performance related tricks than older ones (YMMV on which tricks are
> actually better).
>
>
>> Faster in what? Response time?
>>
>> 1. response time, MISS and HIT are faster
>>
>> Example:
>>
>> on Centos MEM_HIT are about  0-1 msec against Debian about 3-4 msec
>>
> On the same test traffic?
>
>
> Amos

Thanks Amos, we will take care during the compilation.

But to be sure of tests:

Using same settings, same cache, same hardware and same destination 
websites.