[Seaside] TTFB, Apache, Seaside Performance Problem

Thu Jan 5 12:07:52 UTC 2017

Mariano, no, there is no difference in the response time between localhost
and 127.0.0.1
I entered now the ip of the server there.

Don't you think that this should be written in the book?
http://book.seaside.st/book/advanced/deployment/deployment-apache/configure-apache

2017-01-05 12:58 GMT+01:00 Mariano Martinez Peck [via Smalltalk] <
ml-node+s1294792n4928845h90 at n4.nabble.com>:

> Wow, that's what I call to nail it! hahahaha.
>
> Norbert, do you have some explanation we could all learn from it? It's
> something concrete about Apache or is it something as general as resolving
> localhost could take longer than 127.0.0.1?
>
> Sabine, do you see a difference in the response time  when ping to
> localhost and 127.0.0.1 ?
>
> Thanks in advance,
>
> On Thu, Jan 5, 2017 at 8:47 AM, Sabine Manaa <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=4928845&i=0>> wrote:
>
>> The problem is solved: I had to replace localhost by 127.0.0.1
>> Thanks a lot Norbert Hartl for your advice!
>>
>> 2017-01-05 12:25 GMT+01:00 Sabine Manaa [via Smalltalk] <[hidden email]
>> <http:///user/SendEmail.jtp?type=node&node=4928844&i=0>>:
>>
>>> Hi,
>>>
>>> I need the help of the community.
>>>
>>> I am not succeding in making our app faster.
>>> The problem is the Time to first Byte (TTFB). It is always more than one
>>> second which is much to much.
>>> We reduced the problem to a problem between apache and pharo/seaside.
>>>
>>> For this, I have a test application which only renders "hello World". So
>>> I am sure it is not my code, my database, my css, my js, my ssl.... :-)
>>>
>>> I optimized and learned a lot for my app, but it did not solve the TTFB
>>> problem, which costs 1 additional sec for each click of the user which is
>>> inaceptable.
>>>
>>> Please follow this tests to see the problem:
>>>
>>> ===>>> Test 1: test.html without Pharo/seaside
>>> https://tools.keycdn.com/performance?url=http://app.spesenfu
>>> chs.de/test.html
>>> TTFB in Frankfurt below 10 ms -> this proves that the server and
>>> configuration is fast.
>>>
>>> ===>>> Test 2: hello world, simple seaside page
>>> https://tools.keycdn.com/performance?url=app.spesenfuchs.de/hello
>>> TTFB in Frankfurt more than 1 second! -> this proves that it is not my
>>> application :-) it is only a hello world seaside page...
>>>
>>> ===>>> Test 3: my login page
>>> https://tools.keycdn.com/performance?url=app.spesenfuchs.de/rka
>>> TTFB in Frankfurt more than 1 second!
>>>
>>> (alternative: enter the urls into https://gtmetrix.com/)
>>>
>>> In Apache, we enabled tracing of the rewrite and this tells me (i
>>> assume), that apache makes the rewrite very fast, within the same
>>> millisecond :-)
>>> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace2] [pid 1288:tid 1692]
>>> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
>>> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
>>> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] init
>>> rewrite engine with requested uri /hello
>>> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace3] [pid 1288:tid 1692]
>>> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
>>> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
>>> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] applying
>>> pattern '^/rka(.*)$' to uri '/hello'
>>> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace3] [pid 1288:tid 1692]
>>> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
>>> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
>>> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] applying
>>> pattern '^/hello(.*)$' to uri '/hello'
>>> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace2] [pid 1288:tid 1692]
>>> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
>>> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
>>> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] rewrite
>>> '/hello' -> 'http://localhost:8085/HelloWorld/'
>>> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace2] [pid 1288:tid 1692]
>>> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
>>> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
>>> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] forcing
>>> proxy-throughput with http://localhost:8085/HelloWorld/
>>> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace1] [pid 1288:tid 1692]
>>> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
>>> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
>>> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] go-ahead
>>> with proxy request proxy:http://localhost:8085/HelloWorld/ [OK]
>>>
>>> So, I assume that there is problem between Apache and Seaside....
>>>
>>> My questiond are:
>>> what can I do to find the bottleneck?
>>> what is the reason that is so slow?
>>> your help is very appreciated because I have run out of ideas what it
>>> could be and I was investigating it several days now.
>>>
>>> Concerning the system:
>>> The server is at Amazon ec2 windows Server 2009 R2 SP1
>>> The Apache version is 2.4.23
>>> The configuration of the apache is like this (as described in the
>>> seaside book http://book.seaside.st/book/ad
>>> vanced/deployment/deployment-apache/configure-apache)
>>>
>>> <VirtualHost *:80>
>>>       ProxyPreserveHost On
>>>       ServerName app.spesenfuchs.de
>>>       RewriteEngine On
>>> <Directory "C:\xampp\htdocs">
>>>         Require all granted
>>> </Directory>
>>>      DocumentRoot "C:\xampp\htdocs"
>>>      RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
>>>
>>>     RewriteRule ^/rka(.*)$ http://localhost:8085/RKA/$1 [proxy,last]
>>>    RewriteRule ^/hello(.*)$ http://localhost:8085/HelloWorld/$1 [proxy,last]
>>>
>>> </VirtualHost>
>>>
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>>
>>
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>> Problem
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>
>
> --
> Mariano
> http://marianopeck.wordpress.com
>
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