Thanks for your support.
I have tried both approaches with OS threads and Coro.
As above started one OS thread per vendor (used limited functionality for 3 vendors) and serial loop for inside calls per thread.
With Coro started 3 threads and each doing inside calls asynchronously.
Even though Coro seems to fetch all results in parallel overall response time for Coro is much higher.
Is this because Coro is running in a single process while OS threads has 4.
I thought as my scripts waits for IO for larger amount of time compared to actually process the received data Coro should win.

I have logged request and response times for SOAP calls for both as below. 

Using OS threads total time 13 seconds

Start time Tue Sep 30 15:29:00 2014
Request 859 sent time Tue Sep 30 15:29:01 2014        #thread 1
Request 532 sent time Tue Sep 30 15:29:01 2014        #thread2    
Request 906 sent time Tue Sep 30 15:29:02 2014        #thread3
Response 859 receive time Tue Sep 30 15:29:03 2014    #thread 1 respon
+se
Request 155 sent time Tue Sep 30 15:29:03 2014
Response 532 receive time Tue Sep 30 15:29:03 2014    #thread 2 respon
+se
Request 232 sent time Tue Sep 30 15:29:04 2014
Response 906 receive time Tue Sep 30 15:29:04 2014    #thread 3 respon
+se
Request 870 sent time Tue Sep 30 15:29:04 2014
Response 870 receive time Tue Sep 30 15:29:06 2014
Request 570 sent time Tue Sep 30 15:29:06 2014
Response 232 receive time Tue Sep 30 15:29:07 2014
Response 155 receive time Tue Sep 30 15:29:07 2014
Request 461 sent time Tue Sep 30 15:29:07 2014
Response 570 receive time Tue Sep 30 15:29:09 2014
Request 585 sent time Tue Sep 30 15:29:09 2014
Response 585 receive time Tue Sep 30 15:29:10 2014
Response 461 receive time Tue Sep 30 15:29:10 2014
Request 479 sent time Tue Sep 30 15:29:10 2014
Response 479 receive time Tue Sep 30 15:29:13 2014

Using Coro's total time 31 sec
Coros 
Start time Tue Sep 30 16:03:53 2014
Request 812 sent time Tue Sep 30 16:03:53 2014        #thread1
Request 923 sent time Tue Sep 30 16:03:54 2014        #thread2
Request 942 sent time Tue Sep 30 16:03:57 2014        #thread3
Response 812 receive time Tue Sep 30 16:03:59 2014    #thread1 respons
+e
Response 923 receive time Tue Sep 30 16:04:00 2014    #thread2 respons
+e
Response 942 receive time Tue Sep 30 16:04:01 2014    #thread3 respons
+e
# individual threads starting sub threads async 
Request 312 sent time Tue Sep 30 16:04:01 2014
Request 607 sent time Tue Sep 30 16:04:02 2014
Request 578 sent time Tue Sep 30 16:04:03 2014
Request 675 sent time Tue Sep 30 16:04:04 2014
Request 310 sent time Tue Sep 30 16:04:05 2014
Request 720 sent time Tue Sep 30 16:04:06 2014
Request 502 sent time Tue Sep 30 16:04:07 2014
Request 867 sent time Tue Sep 30 16:04:08 2014
Response 312 receive time Tue Sep 30 16:04:11 2014
Response 607 receive time Tue Sep 30 16:04:13 2014
Response 578 receive time Tue Sep 30 16:04:16 2014
Response 675 receive time Tue Sep 30 16:04:18 2014
Response 310 receive time Tue Sep 30 16:04:21 2014
Response 720 receive time Tue Sep 30 16:04:22 2014
Response 502 receive time Tue Sep 30 16:04:24 2014
Response 867 receive time Tue Sep 30 16:04:26 2014

[download]

May be i am better of with BrowserUK suggested approach or have not understood Coro correctly.
please suggest.

In reply to Re^6: Do I need to use Coro instead of threads/forks by mohan2monks
in thread Do I need to use Coro instead of threads/forks by mohan2monks

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