Question: Could hardware problems cause JIT deoptimization?

[Vladimir Kozlov]

You can use -Xlog:deoptimization=debug flag to see reasons for 
deoptimization.

Is hardware configuration the same? Or that server has more cores? Which 
could explain more deoptimized frames.

Regards,
Vladimir K

On 11/10/25 4:00 AM, Andrew Haley wrote:
> On 10/11/2025 08:12, 星晴 wrote:
>> We have deployed the same application (Gravitee Gateway 3.5.16) on 
>> multiple servers with the same software configuration. However, when 
>> capturing flame graphs, we observed significantly different levels of 
>> JIT deoptimization across machines. On one server, the percentage of 
>> deoptimized frames was as high as 40%.
> 
>> So my question is: the high deoptimization rate is caused by hardware 
>> problems?
> 
> Almost by definition, hardware problems can cause anything. But some 
> profiling can cause deoptimization when it rewrites bytecodes. For 
> example, async-profiler can do it if you use method tracing. So I'd 
> investigate this possibility first.
>