T61p: Slow 2D performance

I have a new T61P with nVidia Quadro FX 570M, on XP with latest drivers (6.14.11.7471). Its all good except that just dragging windows (contents visible) the refresh is real slow so that I see multiple versions of the window I am dragging. I downgraded to XP as the factory build of vista had the same issue and I thought it was that. Via start, right click 'computer', properties, advanced, performance .. I have turned off everything (except all windows contents to be seen while dragging) and it still happens but to a lesser extent. I have also turned off the PowerMizer settings so that, I assume, the GPU runs are full speed. Plus the laptop power setting is on 'Maximum Performance'. 3D performance seems fine. CPU and disk are not busy. Any idea what the issue is? GPU or CPU clock, wrong drivers, config? Any help would be appreciated Thanks. Waste.
Solved!
Go to Solution.

Just in case I missed something, I did this again.
Via add/remove programs, uninstalled nvidia drivers, then restarted. XP selected default VGA. I then installed the nvidia drivers and restarted again.
Unfortunately the same.
Anyway, thanks for the suggestion.

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Resolution History
12-JUN-07 15:01:17 GMT
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UPDATE
=======
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/usr/bin/java
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STATUS
=======
@CUS -- Waiting for requested information

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Moderator Message : Duplicate post locked.
Edited by: Vinod Kumar on May 12, 2011 10:59 AM

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select p.master_id link, p.first_name||' '||p.middle_name||' '||p.last_name||' '||p.suffix personname,
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----------------------------------------   Waited ---------- ------------
db file scattered read                       1276        0.00          0.16
db file sequential read                       812        0.00          0.02
direct path read                             1552        0.00          0.61
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      1      NESTED LOOPS
      1       SORT (UNIQUE)
      1        TABLE ACCESS   MODE: ANALYZED (BY INDEX ROWID) OF
                   'PERSON_SYSTEMS' (TABLE)
      1         INDEX   MODE: ANALYZED (RANGE SCAN) OF
                    'IDX_PERSON_SYSTEMS_SOURCE_KEY' (INDEX)
      1       INDEX   MODE: ANALYZED (UNIQUE SCAN) OF 'PK_PERSONS'
                  (INDEX (UNIQUE))
      1      TABLE ACCESS   MODE: ANALYZED (BY INDEX ROWID) OF
                 'PERSONS' (TABLE)

Patrick, interesting insight. Thank you.
The optimizer must be peeking at my bind variables with it's eyes closed. I'm the only one testing and I've never passed %anything as a bind value. :)
Here's what I've learned since my last post:
I don't think that sqldeveloper is actually using the explain plan it says it is. When I run explain plan in sqldeveloper (with a bind variable) it shows me the exact same plan as Apex with a bind variable. However, when I run autotrace in sqldeveloper, it takes a path that matches the hard coded values, and returns results in half a second. That autotrace run is consistent with actually running the query outside of autotrace. So, I think either sqldeveloper isn't really using bind variables, OR it is using them in some other way that Apex does not, or maybe optimizer peeking works in sqldeveloper?
Using optimizer hints to tweak the plan helps. I've tried both /*+ FIRST_ROWS */ and /*+ index(ps pk_persons) */ and both drop the query to about a second. However, I'm loath to use hints because of the very dynamic nature of the query (and Tom Kyte doesn't like them either). The hints may end up hurting other variations on the query.
I also tested the query by wrapping it in a select count(1) from ([long query]) and testing the performance in sqldeveloper and in Apex. The performance in that case is identical with both bind variables and hard coded variables for both Apex and SqlDeveloper. That to me was very interesting and I went so far as to set up two bind variable report regions on the same page. One region wrapped the long query with select count(1) from (...) and the other didn't. The wrapped query ran in 0.01 seconds, the unwrapped took 15ish seconds with no other optimizations. Very strange.
To get performance up to acceptable levels I have changed my function returning query to:
1) Set the equality operator to "=" for values without wildcards and "like" for user input with wildcards. This makes a HUGE difference IF no wildcard is used.
2) Insert a /*+ FIRST_ROWS */ hint when users chose the column that requires the sub-query. This obviously changes the optimizer's plan and improves query speed from 15 seconds to 1.5 seconds even with wildcards.
I will NOT be hard coding any user supplied values in the query string. As you can probably tell by the query, this is an application where sql injection would be very bad.
Jeff, regarding your question about "like '%' || :P71_SEARCH_SOURCE1 || '%'". I've found that putting wildcards around values, particularly at the beginning will negate any indexing on the column in question and slows performance even more.
I'm still left wondering if there isn't something in Apex that is breaking the optimizer "peeking" that Patrick describes. Perhaps something in the way it switches contexts from apex_public_user to the workspace schema?

T61p: Slow 2D performance

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