[omniORB] Scalability and maxStrands

06 Aug 1998 17:03:40 +0100

--Multipart_Thu_Aug__6_17:03:40_1998-1
Content-Type: text/plain; charset=US-ASCII

Hi Randy,

I have not been able to reproduce the bug you are seeing on Solaris 2.5.

Attached is the test program I used, could you try it with your set up to
see if it fails?

Sai-Lai

rshoup@tumbleweed.com (Randy Shoup) writes:

>   We have run into a scalability problem using omniORB2.5.0, and wanted
> some input.  It seems that the maximum number of strands per rope is
> hard-coded to 5 in tcpSocketMTfactory.cc(529).  This means that a single
> client can only have 5 simultaneous connections to any particular
> server.  I have several questions:
> 
> 1. Is there any reason why this value is hard-coded to 5?
> 2. Would there be any problem increasing this value?
> 3. Are there any plans to make this more configurable -- e.g., through
> an ORB command-line argument or compile-time parameter?
> 
> In addition, comments in rope.h(759) imply that for maxStrands of n, the
> (n+1)'th request will block until a strand is released.  When we exceed
> the number of strands, instead of blocking, omniORB throws an
> exception.  This occurs both on NT4 and Solaris2.6.
> 
> 4. Any chance this is fixed?
> 
> Thanks for your help,

--Multipart_Thu_Aug__6_17:03:40_1998-1
Content-Type: application/octet-stream
Content-Disposition: attachment; filename="conclt.cc"
Content-Transfer-Encoding: base64
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==

--Multipart_Thu_Aug__6_17:03:40_1998-1
Content-Type: application/octet-stream
Content-Disposition: attachment; filename="consrv.cc"
Content-Transfer-Encoding: base64
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--Multipart_Thu_Aug__6_17:03:40_1998-1
Content-Type: text/plain; charset=US-ASCII

-- 
Dr. Sai-Lai Lo                          |       Research Scientist
                                        |
E-mail:         S.Lo@orl.co.uk          |       Olivetti & Oracle Research Lab
                                        |       24a Trumpington Street
Tel:            +44 223 343000          |       Cambridge CB2 1QA
Fax:            +44 223 313542          |       ENGLAND

--Multipart_Thu_Aug__6_17:03:40_1998-1--