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Garbage Collection
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(Continued from previous part...)
I got the following output:
Time Total Free Free Total Act. Dead Over
sec. Mem. Mem. Per. Obj. Obj. Obj. Head
0 1984 1727 87% 0 0 0 257
0 1984 1593 80% 128 128 0 263
1 1984 1464 73% 256 256 0 264
1 1984 1334 67% 384 384 0 266
2 1984 1204 60% 512 512 0 268
2 1984 1074 54% 640 640 0 270
....
15 5256 1265 24% 3840 3840 0 151
16 5256 1135 21% 3968 3968 0 153
16 5256 1005 19% 4096 4096 0 155
17 5256 1003 19% 4096 3968 128 157
17 5256 1002 19% 4096 3840 256 158
....
26 5256 588 11% 4480 2432 2048 188
26 5256 459 8% 4608 2560 2048 189
27 5256 329 6% 4736 2688 2048 191
27 5256 199 3% 4864 2816 2048 193
28 8128 2998 36% 2944 2944 0 2186
28 8128 2868 35% 3072 3072 0 2188
29 8128 2738 33% 3200 3200 0 2190
29 8128 2608 32% 3328 3328 0 2192
....
45 8128 634 7% 5248 3200 2048 2246
45 8128 504 6% 5376 3328 2048 2248
46 8128 375 4% 5504 3456 2048 2249
46 8128 245 3% 5632 3584 2048 2251
47 8128 2230 27% 3712 3712 0 2186
47 8128 2100 25% 3840 3840 0 2188
48 8128 1970 24% 3968 3968 0 2190
48 8128 1840 22% 4096 4096 0 2192
....
61 8128 645 7% 5248 3200 2048 2235
62 8128 515 6% 5376 3328 2048 2237
62 8128 385 4% 5504 3456 2048 2239
63 8128 256 3% 5632 3584 2048 2240
63 8128 2230 27% 3712 3712 0 2186
64 8128 2100 25% 3840 3840 0 2188
64 8128 1970 24% 3968 3968 0 2190
65 8128 1840 22% 4096 4096 0 2192
....
77 8128 645 7% 5248 3200 2048 2235
78 8128 515 6% 5376 3328 2048 2237
78 8128 385 4% 5504 3456 2048 2239
79 8128 256 3% 5632 3584 2048 2240
79 8128 2230 27% 3712 3712 0 2186
80 8128 2100 25% 3840 3840 0 2188
80 8128 1970 24% 3968 3968 0 2190
81 8128 1840 22% 4096 4096 0 2192
....
93 8128 645 7% 5248 3200 2048 2235
94 8128 515 6% 5376 3328 2048 2237
94 8128 385 4% 5504 3456 2048 2239
95 8128 256 3% 5632 3584 2048 2240
95 8128 2230 27% 3712 3712 0 2186
96 8128 2100 25% 3840 3840 0 2188
96 8128 1970 24% 3968 3968 0 2190
97 8128 1840 22% 4096 4096 0 2192
....
109 8128 645 7% 5248 3200 2048 2235
110 8128 515 6% 5376 3328 2048 2237
110 8128 385 4% 5504 3456 2048 2239
111 8128 255 3% 5632 3584 2048 2241
111 8128 2230 27% 3712 3712 0 2186
112 8128 2100 25% 3840 3840 0 2188
112 8128 1970 24% 3968 3968 0 2190
113 8128 1840 22% 4096 4096 0 2192
....
The garbage collection had no problem with the memory requirement changing
between 2048KB and 4096KB.
Notice that the free memory right garbage collection is also 27%.
Then I increased the memory requirement again with:
java -Xms2m -Xmx8m GCTest 16 24 > tail_16_24.out
I got the following output:
Time Total Free Free Total Act. Dead Over
sec. Mem. Mem. Per. Obj. Obj. Obj. Head
0 1984 1727 87% 0 0 0 257
0 1984 1593 80% 128 128 0 263
1 1984 1464 73% 256 256 0 264
1 1984 1334 67% 384 384 0 266
....
10 3124 541 17% 2432 2432 0 151
10 3124 412 13% 2560 2560 0 152
11 3124 282 9% 2688 2688 0 154
11 5256 2303 43% 2816 2816 0 137
12 5256 2173 41% 2944 2944 0 139
....
19 5256 356 6% 4736 4736 0 164
19 5256 226 4% 4864 4864 0 166
20 8128 2998 36% 4992 4992 0 138
20 8128 2868 35% 5120 5120 0 140
21 8128 2866 35% 5120 4992 128 142
21 8128 2864 35% 5120 4864 256 144
22 8128 2863 35% 5120 4736 384 145
22 8128 2861 35% 5120 4608 512 147
23 8128 2859 35% 5120 4480 640 149
23 8128 2858 35% 5120 4352 768 150
24 8128 2856 35% 5120 4224 896 152
24 8128 2854 35% 5120 4096 1024 154
25 8128 2852 35% 5120 3968 1152 156
25 8128 2851 35% 5120 3840 1280 157
26 8128 2849 35% 5120 3712 1408 159
26 8128 2847 35% 5120 3584 1536 161
27 8128 2846 35% 5120 3456 1664 162
27 8128 2844 34% 5120 3328 1792 164
28 8128 2842 34% 5120 3200 1920 166
28 8128 2840 34% 5120 3072 2048 168
29 8128 2839 34% 5120 2944 2176 169
29 8128 2837 34% 5120 2816 2304 171
30 8128 2835 34% 5120 2688 2432 173
30 8128 2834 34% 5120 2560 2560 174
31 8128 2832 34% 5120 2432 2688 176
31 8128 2830 34% 5120 2304 2816 178
32 8128 2828 34% 5120 2176 2944 180
32 8128 2827 34% 5120 2048 3072 181
33 8128 2697 33% 5248 2176 3072 183
33 8128 2567 31% 5376 2304 3072 185
34 8128 2437 29% 5504 2432 3072 187
34 8128 2308 28% 5632 2560 3072 188
35 8128 2178 26% 5760 2688 3072 190
35 8128 2048 25% 5888 2816 3072 192
36 8128 1918 23% 6016 2944 3072 194
36 8128 1788 21% 6144 3072 3072 196
37 8128 1659 20% 6272 3200 3072 197
37 8128 1529 18% 6400 3328 3072 199
38 8128 1399 17% 6528 3456 3072 201
38 8128 1269 15% 6656 3584 3072 203
39 8128 1140 14% 6784 3712 3072 204
39 8128 1010 12% 6912 3840 3072 206
40 8128 880 10% 7040 3968 3072 208
40 8128 750 9% 7168 4096 3072 210
41 8128 620 7% 7296 4224 3072 212
41 8128 491 6% 7424 4352 3072 213
42 8128 361 4% 7552 4480 3072 215
42 8128 231 2% 7680 4608 3072 217
Exception in thread "main" java.lang.OutOfMemoryError
(Continued on next part...)
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