Question

On a fairly brand new 4.2 installation (Apache, mod_perl) I was seeing fairly decent load times (<3s) for most pages and maybe <10s for TWikiVariables? .

• Possibly unrelated, but noteworthy: Today, I made the mistake of WYSIWIG editing the TWikiPreferences? pages, horking the icons, and then finally undoing that.

Anyway, as I was poking around to verify that everything is back and happy again, I naturally tried to hit the TWikiVariables? page.

Problems:

• After 2 minutes, the page still is not loading.
  • I can watch the httpd process suck down >70% of the 800MHz CPU.
  • No errors to speak of anywhere (Apache or TWiki). Just spinning death.
• Further regression:
  • I can append the ?raw=on and the page comes up almost instantly. Same for the print view
  • Forget the "History" of the page -- simply won't come up.
  • I can even Raw Edit the page..... also quick.
  • However, when I try to save from Raw Edit, it just hangs.
    • Yes, I checked r/w permissions
    • INTERESTING NOTE: Even though I have 664'd the file a few times, I notice that /data/TWiki/TWikiVariables.txt,v is stuck with -r--rw-r--- permissions<?>
    • INTERESTING NOTE 2: When I try to Save the Raw Edit, the permissions get changed (probably a lockout?) to -r--r--r-- (for the ",v") and -rw-r--r-- for the regular .txt file.
    • INTERESTING NOTE 3: After giving up on the save, the permissions (see I.N. 2) do not get fixed from what is noted. Not sure if this is standard behavior.

Questions:

• Has anyone seen this problem?
• Could I have corrupted something? answer: no
• Could the INCLUDE at the top be killing me? answer: no
• Is there some way to get better debugging info out of TWiki?

Workaround

Okay, after peeling away the onion one small bit at a time (and rolling back Plugins and minor edits), I think I found the workaround. Turns out that there is one variable that will truly mess you up. LINKTOOLTIPINFO is the culprit..... For large pages like TWikiVariables? and TWikiDocGraphics? , having this variable enabled will send the system into meltdown mode. Blech.

• Alternate 1: In the TWiki.TWikiPreferences you will must use: Set LINKTOOLTIPINFO = off . Turning the LINKTOOLTIPINFO on simply sends the TWikiVariables? page to endless chunk mode.
• Alternate 2: You can place_ Set LINKTOOLTIPINFO = off _at the top of your TWikiVariables page.
• Alternate 3: Leave it off for TWiki.TWikiPreferences but enable for your subwebs by setting nor WebPreferences to have the LINKTOOLTIPINFO variable.

NOTE: For serious performance gains, I made sure to Set LINKTOOLTIPINFO = off for the sub-web's WebLeftBar

I will go ahead and mark this question as answered and leave the workaround here for posterity. Hopefully, this is a performance-type issue that can be looked at in some level.

Environment

-- RedByer - 14 May 2008

Answer

-- RedByer - 15 May 2008

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