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From "Bremser, Kurt (AMOS Austria GmbH)" <Kurt.Brem...@allianz.at>
Subject Re: [users@httpd] Memory mapping in Apache question [wd-vc]
Date Mon, 14 Sep 2015 05:17:54 GMT
On any serious operating system, accessing the same content will be memory-mapped after the
first request, since from then on the file(s) in question will be cached.
Reducing the complexity inside apache may even give a benefit.

Kurt Bremser
AMOS Austria

Newton was wrong. There is no gravity. The Earth sucks.
________________________________
Von: Rose, John B [jbrose@utk.edu]
Gesendet: Freitag, 11. September 2015 22:28
An: users@httpd.apache.org
Betreff: **SPAM?** [users@httpd] Memory mapping in Apache question [wd-vc]

Apache 2.2
Prefork
Red Hat 6

We did a small test with a single image to compare results of it as memory mapped content
and not memory mapped. I expected the memory mapped image to be quicker to load. But in our
testing that did not seem to be the case. Should accessing a memory mapped image be quicker
than non-memory mapped?

I'm doing the below ab test to compare the performance, each 3 times:

ab -n 100000 -c 20 http://abc.com/


If we disable MMAP,

It takes 14.555 seconds, 12.775 seconds, 10.698 seconds.

Average: 12.675s.


If we enable MMAP,
It takes 18.468 seconds, 13.882 seconds, 16.532 seconds

Average: 16.294s.


Thanks

AMOS Austria GmbH 
1130 Wien, Hietzinger Kai 101-105 
FN 365014k, Handelsgericht Wien 
UID: ATU 66614737 

http://www.allianz.at 

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