Speed tradeoff of Java's -Xms and -Xmx options

Question

Given these two commands

A:

$ java -Xms10G -Xmx10G myjavacode input.txt

B:

$ java -Xms5G -Xmx5G myjavacode input.tx         


        

Answer 1

> C:\java -X

-Xmixed           mixed mode execution (default)
-Xint             interpreted mode execution only
-Xbootclasspath:
                  set search path for bootstrap classes and resources
-Xbootclasspath/a:
                  append to end of bootstrap class path
-Xbootclasspath/p:
                  prepend in front of bootstrap class path
-Xnoclassgc       disable class garbage collection
-Xincgc           enable incremental garbage collection
-Xloggc:    log GC status to a file with time stamps
-Xbatch           disable background compilation
-Xms        set initial Java heap size
-Xmx        set maximum Java heap size
-Xss        set java thread stack size
-Xprof            output cpu profiling data
-Xfuture          enable strictest checks, anticipating future default
-Xrs              reduce use of OS signals by Java/VM (see documentation)
-Xcheck:jni       perform additional checks for JNI functions
-Xshare:off       do not attempt to use shared class data
-Xshare:auto      use shared class data if possible (default)
-Xshare:on        require using shared class data, otherwise fail.

The -X options are non-standard and subject to change without notice.

(copy-paste)