Hi, Well to wrap this up for me at least. I tested with a very simple benchmark on Linux and I see the expected behavior.
JDK 8 CRC32 is fast, but slows down with -XX:-UseCLMUL -XX:-UseCRC32Intrinsics. JDK 7 both implementations perform similarly The JDK 8 non-intrinsic may have gotten slower. I didn't repeat enough to confirm. I repeated the same test on OS X and -XX:-UseCLMUL -XX:-UseCRC32Intrinsics have no effect on JDK 8. The performance remains high. JDK 7 had the same high performance as JDK 8 and this is with me invoking javac/java from the CLI with an absolute path. The benchmark also prints out the java.version property which confirms that JDK 7 is really going that fast. Regards, Ariel On Wed, Jan 21, 2015, at 03:15 PM, Ariel Weisberg wrote: > Hi, > > I cleaned up the results and converted to bytes and megabytes/second by > multiplying byteSize with ops/sec. > > https://docs.google.com/spreadsheets/d/1SirRnW7JOqUvAZhx0b2HjJug8lQGHAUiDU8-6Zcb9Os/edit?usp=sharing > > Thanks, > Ariel > > On Wed, Jan 21, 2015, at 12:40 PM, Andrew Haley wrote: > > On 01/21/2015 05:34 PM, Ariel Weisberg wrote: > > > If you could shed any light on what the performance should be it would > > > help when choosing whether to use the JDK CRC32 implementation or > > > another depending on the currently runtime. > > > > Please normalize the output to bytes/s; it's very confusing. > > > > Andrew. > >
