I have some virtual hosts with well over 100 redirects and I have not seen a user perceptible performance difference. I am sure there will be a machine measurable different between the time it takes for the first redirect versus the last but it doesn't affect the user experience.
Darryl Baker, GSEC (he/him/his)
Sr. System Administrator
Distributed Application Platform Services
Northwestern University
1800 Sherman Ave.
Suite 6-600 – Box #39
Evanston, IL 60201-3715
darryl.baker@xxxxxxxxxxxxxxxx
(847) 467-6674 <tel:+18474676674>
On 9/21/21, 2:52 PM, "Christophe JAILLET" <christophe.jaillet@xxxxxxxxxx> wrote:
Hi,
Le 20/09/2021 à 18:29, Dave Wreski a écrit :
> Hi,
>
> At what point does it begin to affect performance with the number of
> redirects and rewrites being used on a website? Have there been any
> performance studies on this?
I've never seen such benchmark up to now.
>
> We have a website (linuxsecurity.com) that's been around for decades,
> through many migrations, and have collected many (~10k) redirects along
> the way.
>
> We've also gone through a Joomla migration from the old
> /content/view/33/45 style links to the SEF/title alias format, and have
> a script that translates those dynamically as requested.
>
> Of course it depends on server load and other factors, but when does it
> become a point where searching through thousands of links that Apache
> has stored in memory results in some significant additional delay?
>
> Are there other methods of doing these redirects?
Have a look at RewriteMap with dbm files [1], [2].
It looks like what you are looking for.
Your conf file will be much smaller using an indexed file format should
highly reduce the overhead of thousands of redirections to check.
> Would implementing
> them in Joomla directly make any difference, or only add another layer
> of abstraction?
I think that it would add another layer of abstraction.
>
> Here's one example of a rewrite we're currently using:
> RewriteRule
> ^/features/features/verifying-linux-server-security-what-every-admin-needs-to-know$
> /features/features/verifying-linux-server-security [L,R=301]
>
> RewriteRule
> ^/advisories/fedora/fedora-25-rubygem-rmagick-security-update$
> /advisories/fedora/fedora-25-rubygem-rmagick-security-update-15-25-00-217101
> [L,R=301]
If all your rules are like that (i.e. if you don't have regex), the
above RewriteMap dbm should be just fine.
> Also, is there a way to trace a specific redirect? I've somehow created
> a redirect loop with one of our articles, but enabling tracing on the
> whole site will create a significant amount of data that makes it very
> difficult to focus on just the one I'm interested in.
I don't think it is possible.
CJ
> LogLevel warn ssl:error auth_digest:error socache_shmcb:warn
> mpm_worker:warn fcgid:info cache_disk:debug log_config:debug rewrite:trace3
>
> Thanks,
> Dave
[1]: https://urldefense.com/v3/__https://httpd.apache.org/docs/2.4/en/mod/mod_rewrite.html*rewritemap__;Iw!!Dq0X2DkFhyF93HkjWTBQKhk!H15NUmaqyz0QLEZUAATg9MxjKtmyxmho9SiQu1pzWSG6M2_fa1PFADcddd24gDngUhKjOD9KVw$
[2]: https://urldefense.com/v3/__https://httpd.apache.org/docs/2.4/en/rewrite/rewritemap.html*dbm__;Iw!!Dq0X2DkFhyF93HkjWTBQKhk!H15NUmaqyz0QLEZUAATg9MxjKtmyxmho9SiQu1pzWSG6M2_fa1PFADcddd24gDngUhKC89x46Q$
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