using -XX:-UseCompilerSafepoints

[Aleksey Shipilev]

-jvmPrependArgs only affects forked runs.
-f 0 run needs the JVM option right for the host VM (e.g. before -jar).

-Aleksey.

On 11/10/2014 10:45 PM, Deneau, Tom wrote:
> I noticed using -f 0 with -XX:-UseCompilerSafepoints does not hang.
> 
> -- Tom
> 
> 
> -----Original Message-----
> From: Aleksey Shipilev [mailto:aleksey.shipilev at oracle.com] 
> Sent: Monday, November 10, 2014 1:13 PM
> To: Deneau, Tom; jmh-dev at openjdk.java.net
> Subject: Re: using -XX:-UseCompilerSafepoints
> 
> On 11/10/2014 10:05 PM, Deneau, Tom wrote:
>> I wanted to test the effect of the CompilerSafepoints poll instruction 
>> on a doNothing loop.  But when I tried this, the first warmup 
>> iteration (supposed to be 1 second) never returned.  I am using 
>> forking.  so something like -f 1 -jvmPrependArgs 
>> "-XX:-UseCompilerSafepoints"
>>
>> Is this combination legal?
> 
> JMH usage seems legal.
> 
> I wonder if your code is stuck in the infinite loop somewhere with -XX:-UseCompilerSafepoints.
> 
> -Aleksey.
> 
>