coder at ibm.net
coder at ibm.net
Sun Apr 13 09:16:01 New Zealand Standard Time 1997
On 12/04/97 at 12:55 PM, "Jon A. Lambert" <jlsysinc at ix.netcom.com> said:
>> From: coder at ibm.net
>> On 12/04/97 at 12:51 AM, "Jon A. Lambert" <jlsysinc at ix.netcom.com> said:
>> There's no problem if two ObjectID's contain the same timestamp. It
>> doesn't matter at all. What has to be unique is the combination of
>> record# and timestamp -- and that combo must be unique for the entire life
>> of the database. Happily this is not a problem until April 2038, longer
>> if you chose a different timestamp format.
>Ahh your ID has two parts. I use something called a CriticalSection
>object to block the ' id++; ' function. Its very similar to a mutex,
>except the reset occurs automatically upon leaving the code section.
>Its supposed be slightly more efficient, but I believe its really a mutex
>under the covers. I use it alot, all over the place. :-)
Check into the base code for your CriticalSection. I've seen far to many
such blobs whose definition of a critical section is that it is the ONLY
thread in the application allowed to execute for the duration. <shudder>
(This how OS/2 and Windows handle their "critical section" API's, and I've
seen something similar in a library that shall remain nameless for SunOS).
>> I'm rather pleased actually -- the last time I had the server in a shape
>> it would actually run, I had it creating and destroying about 100,000
>> objects per hour while mobiles wandered about the game going in and out of
>> spoof/watcher areas, and breeding like crazy.
>> Figure, that's what, about 40+ million objects being created and
>> destroyed... Certainly not enough to cause a 32bit wrap, but a good
>> enough test to demonstrate that the idea works.
>Whoa Nelly! I don't expect to reach anything approaching this rate of
>creation and destruction.
Neither do I for actual production databases. It was a contrived stress
test of the area. I tend to do a lot of those sorts of things.
Okay, we'll create two rooms linked by a single door.
Now lets create a simple mobile that just bounces back and
forth between those rooms thru that door.
Now lets clone that puppy a few thousand times.
Turn on the box and see what happens!
>Have you checked your machine for viruses lately? ;-)
Heck. I am the virus.
J C Lawrence Internet: claw at null.net
----------(*) Internet: coder at ibm.net
...Honourary Member of Clan McFud -- Teamer's Avenging Monolith...
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