Is it useful to remove comments & spaces from source code?

[howa]

will performance increae if I removed comments & space from source
code using php -w ...?

given that i don't need to modify the source code, & don't use any
cache?

[Erwin Moller]

Re: Is it useful to remove comments & spaces from source code?

howa wrote:

will performance increae if I removed comments & space from source
code using php -w ...?
>
given that i don't need to modify the source code, & don't use any
cache?

Hi

php -w will return the stripped sourcecode (whitespace and comment).
It will not run the script.

If you reduce your filesize by removing comments, you will get:
1) a slightly faster execution (don't expect too much).
2) A headache if you want to modify the code and the usefull comments are
stripped out.

My advise: Don't do it.

If your application is slow, find out why. I am quite sure it is NOT the
commentlines that makes the application slow.

Just do some simple profiling, using microtime() to store the time for each
thing that happens in your script.
In my experience, 9 out of 10 times the reason for slow webapps is a poorly
designed database, or poorly designed query logic.
for example: running 40 seperate queries to build 1 page.

Regards,
Erwin Moller

[howa]

Re: Is it useful to remove comments & spaces from source code?

we will keep an original codes in the SVN,...

the main point is: around 20-30% of file size are from comments &
white space, we think that when each time include_once is called,
dummy information need to be read by PHP interpreter, seems waste of
cpu time...

My advise: Don't do it.
>
If your application is slow, find out why. I am quite sure it is NOT the
commentlines that makes the application slow.
>
Just do some simple profiling, using microtime() to store the time for each
thing that happens in your script.
In my experience, 9 out of 10 times the reason for slow webapps is a poorly
designed database, or poorly designed query logic.
for example: running 40 seperate queries to build 1 page.
>
Regards,
Erwin Moller

[Erwin Moller]

Re: Is it useful to remove comments & spaces from source code?

howa wrote:

we will keep an original codes in the SVN,...
>
the main point is: around 20-30% of file size are from comments &
white space, we think that when each time include_once is called,
dummy information need to be read by PHP interpreter, seems waste of
cpu time...

Well, simply benchmark the execution time with and without comments.

But I don't think you will see a large increase in performance.
The IO needed to read a few K comments will not be impressive...

Remember that every modern OS caches files on disk in memory, even reducing
that overhead..

If your app is slow, find out why first, or you'll be wasting your time
shooting in the dark.

Regards,
Erwin Moller

>
>
>

>My advise: Don't do it.
>>
>If your application is slow, find out why. I am quite sure it is NOT the
>commentlines that makes the application slow.
>>
>Just do some simple profiling, using microtime() to store the time for
>each thing that happens in your script.
>In my experience, 9 out of 10 times the reason for slow webapps is a
>poorly designed database, or poorly designed query logic.
>for example: running 40 seperate queries to build 1 page.
>>
>Regards,
>Erwin Moller

[asdf]

Re: Is it useful to remove comments & spaces from source code?


"howa" <howachen@gmail .comwrote in message
news:1170168271 .039856.63210@m 58g2000cwm.goog legroups.com...

we will keep an original codes in the SVN,...
>
the main point is: around 20-30% of file size are from comments &
white space, we think that when each time include_once is called,
dummy information need to be read by PHP interpreter, seems waste of
cpu time...
>
>

CPU time is cheap. Developer time is expensive. Work it out.

[Michael Fesser]

Re: Is it useful to remove comments &amp; spaces from source code?

..oO(howa)

>the main point is: around 20-30% of file size are from comments &
>white space, we think that when each time include_once is called,
>dummy information need to be read by PHP interpreter, seems waste of
>cpu time...

The real bottlenecks are somewhere else. The xdebug extension contains a
profiler, which can show you where you're really wasting CPU time. It's
in your code, not the comments.

Micha