Re: EPICS Base Release-Candidate Double Feature!

[Keith Thorne <kthorne@ligo-la.caltech.edu>]

Dear Andrew (and others)

	At LIGO, we appreciate the changes for faster loading of databases.

Question: do any of these changes (and the use of dbPvdTableSize shown below) relevant to EPICS gateways?
We have some very busy gateways (> 100,000 PVs) at present.

	Thanks
		Keith Thorne

> On Nov 3, 2016, at 10:27 AM, Andrew Johnson <anj@aps.anl.gov> wrote:
> 
> Hi Murali,
> 
> On 11/02/2016 06:21 PM, Shankar, Murali wrote:
>>>> The 3.15 branch does contain a major performance improvement to the IOC
>>>> when loading large numbers of database records.
>> 
>> Awesome, I can load 100K PV's into a softIOC in a couple of seconds!
>> Thank you so much!
> 
> If you are loading large numbers of records also make sure that you are
> setting the size of the IOC's hash-table before dbLoadDatabase() or
> dbLoadRecords() in your startup script. The size argument must be a
> power of 2 up to 64K:
>    dbPvdTableSize(65536)
> The default size is 512, although we should probably increase that
> nowadays. More hash buckets means more efficient name searches both at
> load-time and by the CA name resolution task.
> 
> - Andrew
> 
> -- 
> Arguing for surveillance because you have nothing to hide is no
> different than making the claim, "I don't care about freedom of
> speech because I have nothing to say." -- Edward Snowdon

------
Keith Thorne <kthorne@ligo-la.caltech.edu>
CDS Software Engineer
LIGO Livingston Laboratory
Livingston, LA 70754
Phone: (225)686-3168 Fax: (225)686-7189