slides

!
"
#
%
&'
(
$
$
,- *
$
" )* *
*
+
.
$
"
§ .
0
§ !
"
0 2
0 2
4
§
0 #
.
0 2
0 #
/
"$-
#
&/
1 $/
/
&
5/
&
$
&& & $
&# &#
/.
&
#
3
$
6
$
-
/
#
$
8
&
3
"
&
$
7"
&
&
/!
9§ (
0
8
-
§ 9
8 /
§
"
/
$
§
&- "
3
§
*
0
;$ & (
.
% // -
:
"
' "
#
8
.
.
&
#
&
$
§
0
;
<
"-
0
<
0
&
.
+
$
$1
"
<
&
= '9 /
&
§
0
.
0
0
& <
&<
;
8
$
"
$
&<
"
"$
&
&!
.
&
$
;
$
%
'
>
&&
&
>&"
$
;
&
. &
§
0
(
;
0
; &
<
<
<
§
&/
5
(
/
/
& $
?
-
"
/&
+
&
&
@
0
>3
<
<
0
%
%
/
/
; &
<
<
5
$
%
+
$
&
?
&
"-
8
/8
+
- 4 /"
6
% // -
:
"
§ 9 $
;
§
;
&
&
&
$
§
.
8 #/
7- § ; 8&
;
A
§
&
#
;
&
/
"* @
0
0
0
§ @
<
;
$
#
-
&
&&
$
$
8
#= '9
8
"
"
7-
+
&&
&<
1
' '9
$
& AAA
/
&A
1
</
-
&
= '9
; 8
$
-&
-
A
§ ' 8
0
2'
""
0
#=
/ "
0
#=
8 1
0
2
0
#' "
0
#
;
"
§
7- 1 $
$
/
"
#&
&
$
#
&
$5 3
%
-
§
0
$
"
& $
>
unreachable
'
$
§
#
0
§
$ "
&
"
§
"
-
B
&'
0
"
$
&& / "
0
"
""
& /
$ "
=
& $
?
8
$ //
"
/
&
§
0
(
& /
"
"
"
1# 8
§
0
# #
#
$
§
0
0
- &/
(
"
&
& /
"
/8
1
& /
"
!
$
( -
;
C
( -
"
4 (> +
D
4
+
E
6
6
F
:
?
=
4 (> +
C*
*E
:
?
*G
*D
*
C
>3
C
-
4 6
+
6
&
4.
#
&/ &
1 # $ 6
Case 1
Case 2
x
Normal: *(x+8)
x
Read Barrier: *(*(x-4)+8)
§
9
?
0
"
0
&
0
0
9
8
.
&
&-
H
&/
- #
C #
1
I
"
/ D#EI
#
&
§ @
&-
1#
0
2
0
#:
&
0
2)
0
# (
§ (
-
&
$
&&
0
(
#7-
0
(
#!
#
?
&
(
&-
-
$
"
-
$
-
"
/
-
#7-
0
&-
"-
#
§
"
-
?
&
4
-
" 6
#!
&8 1 8
-
&
&
#!
(
#
- &
Tuner
Program (Mutator)
a*( GC) = Per-GC Allocate Rate
uT = utilization
30%
50%
s = used space
45 MB
10 MB/s
60 MB
M = Live Data
30 MB
Collector
t = time resolution
R = Tracing Rate
5 ms
50 MB/s
"
"
8
#
$
/
§
0
0
"
>
$ &&
/ - #
0
" /
0
#
&
"
§
0
0
3
8
&
$
& &
/ & //
$
-
$
&& !
9
/
+
$
8
&
&
/
$
1
! H
$
7-
$ C# -
H
-
3
3
§
§
8
-
-
&( D
3
8
C
§ '
0
0
0
§
§ !
3( : &
"
J
$ "9 5
3
3
&-
H
8
#
&
( &-
& 8
3
- &
8
C
8
KC
L
"
&-
"
3
&
§
8
4
0
> "
<
0
= ?$ <
1 ' 3- 6
8
"
&
"
&
8
3
3
8
8
$9
§
0
& /
0
/-
§ % /
0
0
0
-
&-
"8
&
:
/
$ "
"
7-
-
"
&/ &8
1/
8
1
- & &
&& /
+
4
1
5
$
6
*
.
§
0
2
0
#!
"
"
3
&
8
.
§
0
#
3
0
2(
$
0
=
1 /
0
9
#
$
"
$-
" 8
&
$
§
#
!
"
$
1
-
&
&
8
$8
&
!
$
$
&
2
-
§
§
§
"
/
>
0
&
0
0
/
;
/
&
$
&
&
>
=
$
&
&
$
§ %
&
3
&
-
$
-
&
&
"
/- -
/
& &/
-
$
0
4C6 (
0
4 6
<
<
<
"
8
-
:
<
&-
$
&
&
/
-
$8
= '9
/
&
1 /
/
7-
&
$*
$ /
&
/
" #
"
""
$
"
& *
.
§
$
"
!
§
$
§
0
&
>
/
/"
$
"
1 $
/
"
&
#
/
"-
-"
&-
&
&
&
-
"
4
!
/
&
0
0
3
6
/ &
&
&/
-
#
7-
$