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Bug 105536 - [ProfilingPoints] Fraction of time to take snapshot is included in method's execution time
Summary: [ProfilingPoints] Fraction of time to take snapshot is included in method's e...
Status: REOPENED
Alias: None
Product: profiler
Classification: Unclassified
Component: Base (show other bugs)
Version: 6.x
Hardware: PC Windows XP
: P3 blocker (vote)
Assignee: Tomas Hurka
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2007-06-04 10:31 UTC by Alexander Kouznetsov
Modified: 2011-11-02 20:22 UTC (History)
0 users

See Also:
Issue Type: DEFECT
Exception Reporter:

Attachments
Snapshot without PP (2.95 KB, application/octet-stream)
2007-08-24 13:03 UTC, Alexander Kouznetsov 		Details
Snapshot with Take Snapshot PP (2.94 KB, application/octet-stream)
2007-08-24 13:03 UTC, Alexander Kouznetsov 		Details
Snapshot with Take HeapDump PP (2.94 KB, application/octet-stream)
2007-08-24 13:04 UTC, Alexander Kouznetsov 		Details
Add an attachment (proposed patch, testcase, etc.)

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Description Alexander Kouznetsov 2007-06-04 10:31:52 UTC 
NetBeans IDE Dev (Build 200705311200)
1.6.0; Java HotSpot(TM) Client VM 1.6.0-b105
Windows XP version 5.1 running on x86
ru_RU (nb); Cp1251

Steps to reproduce:
- Run performance analysis to measure execution time of some particular method
- Insert Take Snapshot into that method
- Repeat performance analysis
- RESULT: A big amount of time that is needed for Profiler to take a snapshot is
added to method's execution time

This is another example of time inaccuracy introduced by profiling points (see
also issue 79210).
Comment 1 Tomas Hurka 2007-07-16 15:00:08 UTC 
Fixed in trunk.
Comment 2 Alexander Kouznetsov 2007-08-24 13:01:24 UTC 
Failed to verify with
Product Version: NetBeans IDE Dev (Build 200708211200) 
Java: 1.6.0; Java HotSpot(TM) Client VM 1.6.0-b105 
System: Windows XP version 5.1 running on x86; Cp1251; ru_RU (nb)

Method Time is increased by 63% with Take Snapshot PP, and by 155% with Take Heap Dump PP. See attached snapshots.
Comment 3 Alexander Kouznetsov 2007-08-24 13:03:15 UTC 
Created attachment 47298 [details]
Snapshot without PP
Comment 4 Alexander Kouznetsov 2007-08-24 13:03:43 UTC 
Created attachment 47300 [details]
Snapshot with Take Snapshot PP
Comment 5 Alexander Kouznetsov 2007-08-24 13:04:08 UTC 
Created attachment 47301 [details]
Snapshot with Take HeapDump PP
Comment 6 Tomas Hurka 2007-08-27 14:49:32 UTC 
Take snapshot still has some penalty, but current situation is a huge improvement against original state, when time in a range of seconds was added to the 
method execution time, currently this is around one milisecond. Lowering priority to P3.
Comment 7 Tomas Hurka 2007-09-20 15:01:34 UTC 
Not for 6.0
Comment 8 Alexander Kouznetsov 2007-09-20 15:19:30 UTC 
Please don't remove it070918 tags