Two options:

Easy and Simple run with compiled 64bit executable version :

Download at: ab-patched-for-mutiple-requests.tar

To build it by yourself:

• Download httpd-2.2.4.tar from here or Apache’s archive site
• Unpack the tar file and cd into it
• Copy and Paste the patch into the source folder and apply it.  (Download at: ab_append_requests)

• $ cd httpd-2.2.4/support/
  $ patch -p0 < ~/ab_append_requests.patch

• Run ./configure –with-included-apr –enable-static-ab –enable-ssl (the first option will ignore the more recent copy of apr that’ll be on your machine already, and the second will build a static binary—well, not completely static, but good enough to be independent)
• make (you can specify -jn where n is the number of processor cores you have; this will speed up the build a lot)

Instructions

use -R command with the URL file path and other parameters you want:

./ab -n 2 -R randomList.txt -c 2 -g /test/testgnu "http://api.wiki-health.org:55555/healthbook/v1/"

randomList.txt contains your URLs or parameters to be appended to the URL. For example:

max=10&start=1406224391
max=100&start=1406224391

The connections and requests will be sent to the URL one by one from the list.

Thanks to Chris, reference: http://chrismiles.livejournal.com/21720.html