question of ParNewGeneration::real_forwardee_slow

[Thomas Schatzl]

Hi,

On 12.09.19 11:38, Yan Gang wrote:
> Thomas:
> 
> I modify Java option :

   I really recommend only doing one thing at a time: i.e. not change 
options *and* the environment at the same time, or try to find new 
causes for the issues. That will most likely only confuse or scare you, 
and often these are connected in some way, so fixing one may solve the 
other (or may obviate the need to "fix" them).

The environment exhibits very long sys times in your log output which I 
recommend to investigate. They also seem to be causing most of the 
slowdown. I.e. it seems wise to understand and fix these first.

In addition to simply trying the fixes for the most common issues 
presented in the tuning guide, you can use system tools like 
iostat/vmstat/* to get to understand your environment behavior more.

Thanks,
   Thomas