using -XX:-UseCompilerSafepoints

[Deneau, Tom]

Ah, right.  I forgot that.
With that in mind, the hang also happens with -f0
So the simplest way to reproduce the problem is  (I used JDK8 for this)

java  -server -XX:-UseCompilerSafepoints -jar target/benchmarks.jar 'JMHSample_01_.*' -t 1 -wi 5 -i 5 -f 0

-- Tom

-----Original Message-----
From: Aleksey Shipilev [mailto:aleksey.shipilev at oracle.com] 
Sent: Monday, November 10, 2014 2:10 PM
To: Deneau, Tom; jmh-dev at openjdk.java.net
Subject: Re: using -XX:-UseCompilerSafepoints

-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.
> 
>