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JavaCC Buffer location strategy
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| /* | |
| Licensed under the Apache License, Version 2.0 (the "License"); | |
| you may not use this file except in compliance with the License. | |
| You may obtain a copy of the License at | |
| https://xgjvouic68.proxynodejs.usequeue.com/licenses/LICENSE-2.0 | |
| Unless required by applicable law or agreed to in writing, software | |
| distributed under the License is distributed on an "AS IS" BASIS, | |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| See the License for the specific language governing permissions and | |
| limitations under the License. | |
| */ | |
| package dev; | |
| import java.util.function.Function; | |
| public class BufferAlloc { | |
| public static void main(String...args) { | |
| run(1024); | |
| run(2048); | |
| run(2*2048); | |
| run(64*1048); | |
| run(1024*1024); | |
| } | |
| public static void run(int N) { | |
| Function<Long, Long> f1 = x -> x + 2048; | |
| Function<Long, Long> f2 = x -> (x == 2048) ? x+2048 : x+(x>>1); | |
| run("Alloc +2k ", N, f1); | |
| run("Alloc *1.5", N, f2); | |
| System.out.println(); | |
| } | |
| public static void run(String label, int N, Function<Long, Long> growth) { | |
| long size = 2*1024; | |
| long copy = 0; | |
| for ( int i = 0 ; i < 1000 ; i++ ) { | |
| if ( size >= N ) | |
| break; | |
| copy = copy+size; | |
| long x2 = growth.apply(size); | |
| //System.out.printf("%,10d\n", x2); | |
| size = x2; | |
| } | |
| System.out.printf("%s : N = %-,10d, Size = %-,10d Copy = %,d \n", label, N, size, copy); | |
| } | |
| } |
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