jmiettinen

About PrintCompilation

This note tries to document the output of PrintCompilation flag in HotSpot VM. It was originally intended to be a reply to a blog post on PrintCompilation from Stephen Colebourne. It's kind of grown too big to fit as a reply, so I'm putting it here.

Written by: Kris Mok rednaxelafx@gmail.com

Most of the contents in this note are based on my reading of HotSpot source code from OpenJDK and experimenting with the VM flags; otheres come from HotSpot mailing lists and other reading materials listed in the "References" section.

This

jmiettinen

# BE CAREFUL WITH THE END TIMESTAMP SO THAT YOU DON'T GO TOO FAR INTO THE PAST
# IN CASE THERE'S NO MATCHING SNAPSHOT
def find_snapshot(start_timestamp, end_timestamp = start_timestamp - 1, &block);
    end_timestamp = end_timestamp > 0 ? end_timestamp : 0;
    earlier = nil;
    current_timestamp = start_timestamp;
    while current_timestamp > end_timestamp do;
        current_ss = FastormDb.database.get_snapshot(current_timestamp);
        if block.call(current_ss.begin_trx);
            return {:current => current_timestamp, :earlier => earlier };

jmiettinen

public class NestedExceptionTest {

    public void throwNestedExceptions(int n) {
        if (n > 0) {
            try {
              throwNestedExceptions(n-1);
            } catch (Exception e) {
                throw new RuntimeException("Exception on level " + n, e);
            }
        } else {