非常有用，大概长这样
Histogram Over Method Invocation Counters (cutoff = 100):
____Count_(I+C)____Method________________________Module_________________
static jdk.internal.org.objectweb.asm.Frame::merge(Ljdk/internal/org/objectweb/asm/SymbolTable;I[II)Z
interpreter_invocation_count: 130053
invocation_counter: 130053
backedge_counter: 0
decompile_count: 2
compiled_invocation_count: 140114
java.lang.String::charAt(I)C
interpreter_invocation_count: 128425
invocation_counter: 128425
backedge_counter: 0
decompile_count: 1
compiled_invocation_count: 92917
java.lang.Object::<init>()V
interpreter_invocation_count: 172834
invocation_counter: 172834
backedge_counter: 0
decompile_count: 2
compiled_invocation_count: 42821
java.lang.String::isLatin1()Z
interpreter_invocation_count: 149989
invocation_counter: 149989
backedge_counter: 0
decompile_count: 1
compiled_invocation_count: 2538
........
compiled_invocation_count: 0
Invocations summary for 5852 methods:
5642814 (100%) total
4344381 (77.0%) |- interpreted
1298433 (23.0%) |- compiled
2245855 (39.8%) |- special methods (interpreted and compiled)
180710 ( 3.2%) |- synchronized
534792 ( 9.5%) |- final
1477526 (26.2%) |- static
16522 ( 0.3%) |- native
36305 ( 0.6%) |- accessor
Calls from compiled code:
2681 (100%) total non-inlined
2256 (84.1%) |- virtual calls
862271 (38221%) | |- inlined
0 ( 0%) | |- optimized
-239611 (-10621%) | |- monomorphic
241867 (10721%) | |- megamorphic
0 ( 0.0%) |- interface calls
159683 (15968300%) | |- inlined
0 ( 0%) | |- optimized
0 ( 0%) | |- monomorphic
0 ( 0%) | |- megamorphic
425 (15.9%) |- static/special calls
760136 (178856%) | |- inlined
Note 1: counter updates are not MT-safe.
Note 2: % in major categories are relative to total non-inlined calls;
% in nested categories are relative to their category
(and thus add up to more than 100% with inlining)
Histogram of call arity (incl. rcvr, calls to compiled methods only):
0: 10441 ( 0.3%)
1: 1679932 ( 41.7%)
2: 1628808 ( 40.4%)
3: 100806 ( 2.5%)
4: 582562 ( 14.5%)
5: 12904 ( 0.3%)
6: 425 ( 0.0%)
7: 15468 ( 0.4%)
8: 0 ( 0.0%)
9: 0 ( 0.0%)
rest: 0 ( 0.0%)
(avg. arity = 1.9, max = 12)
(total # of compiled calls = 4031346)
(max # of compiled calls = 140114)
Histogram of parameter block size (in words, incl. rcvr):
0: 10441 ( 0.3%)
1: 1678757 ( 41.6%)
2: 1629541 ( 40.4%)
3: 101248 ( 2.5%)
4: 582562 ( 14.5%)
5: 12904 ( 0.3%)
6: 425 ( 0.0%)
7: 0 ( 0.0%)
8: 15468 ( 0.4%)
9: 0 ( 0.0%)
rest: 0 ( 0.0%)
(avg. size = 1.9, max = 12)
(total # of compiled calls = 4031346)
(max # of compiled calls = 140114)