Experimental Physics and
Industrial Control System

[email protected] (Jeff Hill) · Mon, 12 Apr 1999 10:12:39 -0600

Dale,

Certain versions of the early Winsock II libraries under windows 95 had bugs that
resulted in symptoms of this nature, but to the best of my knowledge these versions 
are never installed into windows NT. NT supplies a version of the winsock II
DLL that includes the bug fix for this problem, and layered products installation should 
not replace this DLL with an earlier version.

Symptoms like this might also occur if you have a poorly terminated Ethernet, or
some other network hardware problem.

I do not see a problem of this nature here. However, I am not using SCA and the version
of the CA DLL's from Chris's web site may be based on a slightly different version
of EPICS than we are using here.

Jeff

On Friday, April 09, 1999 8:52 AM, Dale L. Brewe [SMTP:[email protected]] wrote:
> I've been using the Simple Channel Access libraries under NT, and have
> noticed that the time to make an initial connection is quite long. For
> example, using the routine cache_getbyname, it takes about 45sec to get 140
> values initially (~0.33sec/value). I've also tried the batch routines
> que_get and do_get, with a marginal improvement (to ~0.25sec/value), which
> is still pretty difficult to live with. Can anyone tell me if they have a
> similar experience? Is this an inherent limitation of these
> functions/library, or is it possible to improve the performance? My ioc
> uses epics 3.13beta11 and my client (based on LabVIEW) has used sca3.dll
> and ca.dll for 3.13.0 and previous versions.
> Thanks
> Dale Brewe
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  Dale L. Brewe     PNC-CAT/U. of Washington
>  ph: 630 252 0582         fax: 630 252 0580
>  Mail:
>  APS/Argonne National Laboratory
>  Bldg 435E sector 20
>  9700 S. Cass Ave.
>  Argonne, IL 60439
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System