37 lines
1.4 KiB
C
37 lines
1.4 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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int main() {
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printf("=== HAKMEM Tiny Pool Memory Overhead Analysis ===\n\n");
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// 1M allocations of 16B
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const int num_allocs = 1000000;
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const int alloc_size = 16;
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const int slab_size = 65536; // 64KB
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const int blocks_per_slab = slab_size / alloc_size; // 4096
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printf("Data:\n");
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printf(" Total allocations: %d\n", num_allocs);
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printf(" Allocation size: %d bytes\n", alloc_size);
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printf(" Actual data: %d MB\n\n", num_allocs * alloc_size / 1024 / 1024);
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printf("Slab overhead:\n");
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printf(" Slab size: %d KB\n", slab_size / 1024);
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printf(" Blocks per slab: %d\n", blocks_per_slab);
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printf(" Slabs needed: %d\n", (num_allocs + blocks_per_slab - 1) / blocks_per_slab);
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printf(" Total slab memory: %d MB\n",
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((num_allocs + blocks_per_slab - 1) / blocks_per_slab) * slab_size / 1024 / 1024);
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printf("\nTLS Magazine overhead:\n");
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printf(" Magazine capacity: 2048 items\n");
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printf(" Size classes: 8\n");
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printf(" Pointer size: 8 bytes\n");
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printf(" Per-thread overhead: %d KB\n", 2048 * 8 * 8 / 1024);
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printf("\nBitmap overhead per slab:\n");
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printf(" Bitmap size: %d bytes (1 bit per block)\n", blocks_per_slab / 8);
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printf(" Summary bitmap: ~%d bytes\n", (blocks_per_slab / 8) / 64);
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return 0;
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}
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