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Interesting little problem. [message #12830]

Mon, 08 September 2003 23:00

JamesS

Messages: 275
Registered: July 2002
Location: Atlanta, GA

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Senior Member

In an effort to make FUDforum a little more integrated with my site I use an object tag to embed the forum in a certain page. This works except for one thing: the online users list is flaky. Some times it will show who is logged in and other times it will not. To see what I mean vist http://ug.dyndns.org/forum.php (not an advertisment - just the easiest way to show you what I am talking about)

I know that it is not a problem with FUDforum but with the way I am using it. I am just wondering if anyone might know a way to fix this.

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Re: Interesting little problem. [message #12925 is a reply to message #12830]

Thu, 18 September 2003 14:53

Ilia

Messages: 13241
Registered: January 2002

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Administrator
Core Developer

Online status on the front page is cached. You can control for how long (by default 5 minutes) via admin control panel. The 'show what people are doing' on the other hand shows the 'live' data.

FUDforum Core Developer

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Re: Interesting little problem. [message #12943 is a reply to message #12830] Thu, 18 September 2003 15:32

JamesS

Messages: 275
Registered: July 2002
Location: Atlanta, GA

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Senior Member

I kind of thought that might be it. But when I read in the admin control panel it did not sound like that was covered in the cached material. I thought maybe you were doing something like the following for the online users list:


<?php
$five_ago = time() - 300;
$tmp = mysql_query("SELECT uname FROM users WHERE last_access >= $five_ago");

for ( $i = 0; $row = mysql_fetch_assoc($tmp); $i++ ) {
     $ar[$i] = $row['uname'];
}

$list = implode(" ", $ar);
?>

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Re: Interesting little problem. [message #12960 is a reply to message #12943]

Thu, 18 September 2003 16:49

Ilia

Messages: 13241
Registered: January 2002

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Administrator
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The logic is far more complex then your example indicates. Basically there is a special table containing the cached values. If the data in that table is older then what your cache limit it set to, the values in that table are rebuilt. If the cached data is not too old, then the values from the cache table are used.

FUDforum Core Developer

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Re: Interesting little problem. [message #12964 is a reply to message #12830]

Thu, 18 September 2003 17:01

JamesS

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Registered: July 2002
Location: Atlanta, GA

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But which way is more expensive?

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Re: Interesting little problem. [message #12969 is a reply to message #12964]

Thu, 18 September 2003 17:14

Ilia

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Registered: January 2002

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What do you mean more expensive?

FUDforum Core Developer

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Re: Interesting little problem. [message #12984 is a reply to message #12830]

Thu, 18 September 2003 18:17

JamesS

Messages: 275
Registered: July 2002
Location: Atlanta, GA

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Senior Member

In the admin panel you note that the forum info cache build is fairly CPU intensive. By expensive I mean which way do you think takes more processing power? The way I propose in my post or the way things are truly done by the forum software?

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Re: Interesting little problem. [message #12985 is a reply to message #12984]

Thu, 18 September 2003 18:22

Ilia

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Registered: January 2002

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Your way is much slower. Because 1) range query are do not get optimized 2) you end up doing a lot of work realtime, which in current approach is cached. That said, you can safely tune the cache down to 1 minute or so.

FUDforum Core Developer

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Re: Interesting little problem. [message #12987 is a reply to message #12830]

Thu, 18 September 2003 18:31

JamesS

Messages: 275
Registered: July 2002
Location: Atlanta, GA

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Senior Member

I have turned it down to two minutes. I was just curious about the different approaches.

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