Re: [jdt-dev] Read access to enclosing field is emulated by a synthetic

[Simon Brenner <simon.brenner@xxxxxxx>]

Since you are using Windows, the timer precision is about 10msecs (at 
least in Win2k - could be fixed in XP). You should increase the number 
of iterations until you obtain a time difference where a 10msec 
deviation is insignificant.

Gary Gregory wrote:

> Hello All,
>
> In some code I get eclipse compiler warnings like:
>
> Read access to enclosing field GenericObjectPool._evictionCursor is 
> emulated by a synthetic accessor method. Increasing its visibility 
> will improve your performance    GenericObjectPool.java  Jakarta 
> Commons/pool/src/java/org/apache/commons/pool/impl      line 1005
>
> I have created the attached test in order to see what improvements we 
> are talking about. I tried to make the test as simple as possible. On 
> the JRE 1.4.1, sometimes but not always, using "a synthetic accessor 
> method" is slower, sometimes faster. Can you explain what is going on 
> here? On JRE 1.3.1, the synthetic version is always slower (good). Can 
> this be explained away by GC? Or some other internal process?
>
> Thank you,
> Gary
>
> Eclipse Platform
> Version: 2.1.0
> Build id: 200303071024
>
> Test results:
>
> Running Java 1.3.1_07-b02 on Windows XP 5.1 null
>
> iterations = 1000
> withWarningMsecs = 0
> noWarningMsecs = 0
> no difference
>
> iterations = 10000
> withWarningMsecs = 10
> noWarningMsecs = 0
> no warning class is faster by 10 msecs
>
> iterations = 100000
> withWarningMsecs = 10
> noWarningMsecs = 0
> no warning class is faster by 10 msecs
>
> iterations = 1000000
> withWarningMsecs = 30
> noWarningMsecs = 20
> no warning class is faster by 10 msecs
>
> iterations = 10000000
> withWarningMsecs = 290
> noWarningMsecs = 241
> no warning class is faster by 49 msecs
>
> iterations = 100000000
> withWarningMsecs = 2663
> noWarningMsecs = 2354
> no warning class is faster by 309 msecs
>
> Done.
>
> ----------------------------------------------------------
>
> Running Java 1.4.1_02-b06 on Windows XP 5.1 Service Pack 1
>
> iterations = 1000
> withWarningMsecs = 10
> noWarningMsecs = 0
> no warning class is faster by 10 msecs
>
> iterations = 10000
> withWarningMsecs = 0
> noWarningMsecs = 0
> no difference
>
> iterations = 100000
> withWarningMsecs = 10
> noWarningMsecs = 10
> no difference
>
> iterations = 1000000
> withWarningMsecs = 90
> noWarningMsecs = 90
> no difference
>
> iterations = 10000000
> withWarningMsecs = 811
> noWarningMsecs = 821
> no warning class is SLOWER by 10 msecs
>
> iterations = 100000000
> withWarningMsecs = 8152
> noWarningMsecs = 8092
> no warning class is faster by 60 msecs
>
> Done.