How to change compilation policy to trigger C2 compilation ASAP?

[Tangwei (Euler)]

My goal is just to reach peak performance quickly. Following is one tier threshold combination I tried:

-XX:Tier0ProfilingStartPercentage=0
-XX:Tier3InvocationThreshold=3
-XX:Tier3MinInvocationThreshold=2
-XX:Tier3CompileThreshold=2
-XX:Tier4InvocationThreshold=4
-XX:Tier4MinInvocationThreshold=3
-XX:Tier4CompileThreshold=2

Regards!
wei


From: Vitaly Davidovich [mailto:vitalyd at gmail.com]
Sent: Tuesday, May 19, 2015 9:33 PM
To: Tangwei (Euler)
Cc: hotspot compiler
Subject: Re: How to change compilation policy to trigger C2 compilation ASAP?


Is your goal specifically to have C2 compile or just to reach peak performance quickly? It sounds like the latter.  What values did you specify for the tier thresholds? Also, it may help you to -XX:+PrintCompilation to tune the flags as this will show you which methods are being compiled, when, and at what tier.

sent from my phone
On May 19, 2015 9:01 AM, "Tangwei (Euler)" <tangwei6 at huawei.com<mailto:tangwei6 at huawei.com>> wrote:
Hi All,
  I want to run a JAVA application on a performance simulator, and do a profiling on a hot function JITTed with C2 compiler.
In order to make C2 compiler compile hot function as early as possible, I hope to reduce the threshold of function invocation
count in interpreter and C1 to drive the JIT compiler transitioned to Level 4 (C2) ASAP. Following is the option list I try, but
failed to find a right combination to meet my requirement. Anyone can help to figure out what options I can use?
Thanks in advance.

-XX:Tier0ProfilingStartPercentage=0
-XX:Tier3InvocationThreshold
-XX:Tier3MinInvocationThreshold
-XX:Tier3CompileThreshold
-XX:Tier4InvocationThreshold
-XX:CompileThreshold
-XX:Tier4MinInvocationThreshold
-XX:Tier4CompileThreshold

Regards!
wei
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