Huge pages

[Tiago Stürmer Daitx]

On Thu, 2013-04-11 at 16:26 +0200, Volker Simonis wrote:



> Unfortunately I found out the patch is far from stable (it breaks
> '-XX:-UseHugeTLBFS -XX:+UseLargePages -XX:+UseSHM'). So please use it
> with caution.
> I think it will be not trivial to get this working with all the
> combinations of different GCs and +/- compressed oops on all Linux
> architectures.

Hmm, it seems I'm (sometimes) unable to run 2+ patched JVMs concurrently
as well. I haven't yet understood why or when exactly that happens but
one command that does makes cause a fatal error in one of the JVM's is:


diff -u <(java -XX:+UseLargePages -XX:+UseHugeTLBFS -Xms1984m -Xmx1984m
-Xmn1536m -version) <(java -XX:+UseLargePages -XX:+UseHugeTLBFS
-Xms1984m -Xmx1984m -Xmn1536m -version)

Where "java" is a patched binary. I usually run the above with
PrintFlagsFinal and then set some other flags on the second redirect to
check what else also changes.

I have attached the error report for one of the diff runs.

Regargs,
Tiago

-- 
Tiago Stürmer Daitx
tdaitx at linux.vnet.ibm.com
IBM - Linux Technology Center
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