Times don't sum up to 100%

pat · Post by **pat** » Mon Nov 15, 2004 2:40 pm

Hi

I did a CPU profile using method tracing. When analyzing the statistics I saw that the sum of all times spent in the methods called from within a specific method is only 2% of the time spent in that specific method.

What am I doing wrong?

I heard rumors that this phenomenon occurs when a lot of time is spent within constructors. I heard other rumors that this can be prevented by setting a specific property.

Is any of these rumors true?

Cheers
pat

Post by **Vladimir Kondratyev** » Mon Nov 15, 2004 5:43 pm

The method itself can consume CPU (for example in some "for" loop)

Post by **Vladimir Kondratyev** » Mon Nov 15, 2004 5:46 pm

Hot Spot compiler could also inline some simple methods into the body of "caller" method.

pat · Post by **pat** » Tue Nov 16, 2004 7:35 am

Vladimir
thanks for your help

Vladimir Kondratyev wrote:The method itself can consume CPU (for example in some "for" loop)

sure, in my example this was obviously not the case (sorry forgot to mention that my "specific method" doesn't do any time consuming calculations, loops, or similar).

Vladimir Kondratyev wrote:Hot Spot compiler could also inline some simple methods into the body of "caller" method.

yeah, read about that. But I'm not using Hot Spot.

However, I found, that after removing all filters and taking the snapshot again...it worked. I now have to find which library I must remove from the filters such that I get the information needed AND good performance when tracing.

Thanks again & cheers
pat

BTW: ease of installation, integration with Idea, and use deserves an award!

Post by **Vladimir Kondratyev** » Tue Nov 16, 2004 7:54 am

But I'm not using Hot Spot.

Are you using -Xint mode?

I found, that after removing all filters and taking the snapshot again...it worked.

Actually it's strange, because filters are used by profiler UI only and should not affect gathering CPU information.