Re: [simspark-devel] Fwd: about multi-thread implementation

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<style type="text/css">blockquote {color: navy !important; background-color: RGB(245,245,245) !important; padding: 0 15 10 15 !important; margin: 15 0 0 0; border-left: #1010ff 2px solid;}  blockquote blockquote {color: maroon !important; background-color: RGB(235,235,235) !important; border-left-color:maroon !important}  blockquote blockquote blockquote {color: green !important; background-color: RGB(225,225,225) !important; border-left-color:teal !important}  blockquote blockquote blockquote blockquote {color: purple !important; background-color: RGB(215,215,215) !important; border-left-color: purple !important}  blockquote blockquote blockquote blockquote blockquote {color: teal !important; background-color: RGB(205,205,205) !important; border-left-color: green !important}</style><i><b>"Yuan
Xu" <a class="moz-txt-link-rfc2396E" href="mailto:xuy...@gm...">&lt;xuy...@gm...&gt;</a></b></i> wrote on 03/09/2008 12:19:22 PM:</span><br>
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  <pre wrap="">Hi Hedayat and all,

</pre>
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Hi! 
 
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 <pre wrap="">
The rcssserver3d-0.5.6 can run multi-threads in my computer, it does
 not need to call opengl in the main thread. but the cvs head code
 can't.
 It is very strange, so I decide to look into this problem.

Because there are too many differences between cvs head and 0.5.6,
 I copy the barrier implementation to the rcssserver3d-0.5.6,
 then it works! while calling opengl in a new thread.
 I attached the testing server to this mail, could you test it in your system?
 </pre>
</blockquote>
OK, I'll test it ASAP. Interesting! 
 
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 <pre wrap=""> There is another issue should be in mind is that
 the multi-threads increase the sense act latency,
 it makes agent behavior unlike in the singled-thread.
 I think this will make teams in trouble while changing from
 singled-thread to multi-threads.
 What do you think about it?
 </pre>
</blockquote>
Sorry, would you please explain more about the reason of this increased
latency? In both single threaded and multi-threaded modes StartCycle()
is called immediately after EndCycle(). What increases the latency? 
 
And another question: it seems that it is enough to call
SceneServer::Pre/PostPhysicsUpdate() functions once in a cycle. So, we
can apply the same change in Step() for single threaded mode (to call
PhysicsUpdate() function inside it's while loop instead of Update()
function and calling Pre/PostPhysicsUpdate() functions (and
GameControlServer::Update()) outside the while loop); right? It should
benefit performance a little. 
 
Thanks a lot, 
Hedayat 
 
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