[OpenJDK 2D-Dev] [14] RFR JDK-8232634: [TEST_BUG] ICMColorDataTest runs for a long time

[Alexey Ivanov]

Hi Sergey,

On 21/10/2019 20:47, Sergey Bylokhov wrote:
> Hi, Alexey.
>
> On 10/21/19 12:11 pm, Alexey Ivanov wrote:
>> I was running this test in different configurations and found that 
>> the expected exception is thrown at 20-25 thousand iterations 
>> (32-bit). It usually takes 3-4 minutes.
>>
>> If a Garbage Collector cycle is triggered, Java objects 
>> (BufferedImage) are disposed of, and native resources are freed. If 
>> it happens, the test will not throw the expected exceptions. When 
>> using 64-bit JRE, a GC is triggered after 65 thousand iterations, 
>> which takes about 30-40 minutes. I had to use SerialGC because the 
>> default G1 reclaims Java objects too fast, so that the error 
>> condition is never reached.
>
> I am not sure that these exceptions are really "expected", the test 
> just passes if some of them are thrown, but when I run this test on 
> macOSx64 it is completed in 3 minutes w/o any exception(300_000 
> iterations were completed successfully). Why it is so slow in your 
> environment?

Yes, I noticed that the test is pretty fast both on Linux and Mac but 
it's not as fast on Windows. In fact, I reproduced the bug only on 
Windows and only on 32 bit. The bug was in shared code, that's why the 
test is not Windows-specific.

-- 
Regards,
Alexey