search

graalvm / graalvm-ten-things

Top 10 Things To Do With GraalVM
https://medium.com/graalvm/graalvm-ten-things-12d9111f307d
Apache License 2.0
234 stars 38 forks source link

I think, this command is correct. "time java -XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler TopTen large.txt" #6

Open Revolution2021 opened 2 years ago

Revolution2021 commented 2 years ago

Sorry, one more question. In the article(https://medium.com/graalvm/graalvm-ten-things-12d9111f307d ), the following is written.

＞To run without the GraalVM JIT compiler to compare, I can use the flag -XX:-UseJVMCICompiler. JVMCI is the interface between GraalVM and the JVM. You could also compare against your standard JVM as well.

However, in my environment, it doesn't work.

root@taro123:/opt/graalvm-ce-java11-21.3.0/graalvm-ten-things# time java -XX:-UseJVMCICompiler TopTen large.txt
Error: VM option 'UseJVMCICompiler' is experimental and must be enabled via -XX:+UnlockExperimentalVMOptions.
Error: The unlock option must precede 'UseJVMCICompiler'.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

real    0m0.008s
user    0m0.001s
sys     0m0.007s

I think, the below is correct. time java -XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler TopTen large.txt

The below is the successful result for your reference. Is that just a mistake or caused by my environment , GraalVM(CE) + Ubuntu20? 

root@taro123:/opt/graalvm-ce-java11-21.3.0/graalvm-ten-things# time java -XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler TopTen large.txt
sed = 502500
ut = 392500
in = 377500
et = 352500
id = 317500
eu = 317500
eget = 302500
vel = 300000
a = 287500
sit = 282500

real    0m26.024s
user    0m37.151s
sys     0m1.121s

Regards,

wirthi commented 2 years ago

Hi,

can this be the same $PATH problem as in your other ticket? What does java --version print? I guess you are using a stock JDK here instead of GraalVM (despite being inside the GraalVM folder).

While you are in the graalvm-ce-java11-21.3.0 folder, if your $PATH is not set up properly (containing /opt/graalvm-ce-java11-21.3.0/bin before all other java locations) then probably another (non-GraalVM) java is use. Stock JDK does support the UseJVMCICompiler option, but requires the UnlockExperimentalVMOptions flag in addition.

Christian