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June 12, 2022 23:08
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| doug@doug-dt:~/code/tinymembench$ ./tinymembench | |
| tinymembench v0.4.9 (simple benchmark for memory throughput and latency) | |
| ========================================================================== | |
| == Memory bandwidth tests == | |
| == == | |
| == Note 1: 1MB = 1000000 bytes == | |
| == Note 2: Results for 'copy' tests show how many bytes can be == | |
| == copied per second (adding together read and writen == | |
| == bytes would have provided twice higher numbers) == | |
| == Note 3: 2-pass copy means that we are using a small temporary buffer == | |
| == to first fetch data into it, and only then write it to the == | |
| == destination (source -> L1 cache, L1 cache -> destination) == | |
| == Note 4: If sample standard deviation exceeds 0.1%, it is shown in == | |
| == brackets == | |
| ========================================================================== | |
| C copy backwards : 8616.7 MB/s (1.3%) | |
| C copy backwards (32 byte blocks) : 8620.0 MB/s (2.6%) | |
| C copy backwards (64 byte blocks) : 8680.8 MB/s (1.2%) | |
| C copy : 8516.7 MB/s (1.8%) | |
| C copy prefetched (32 bytes step) : 8782.4 MB/s (1.1%) | |
| C copy prefetched (64 bytes step) : 8747.6 MB/s (3.3%) | |
| C 2-pass copy : 7969.1 MB/s (1.0%) | |
| C 2-pass copy prefetched (32 bytes step) : 8109.7 MB/s (1.1%) | |
| C 2-pass copy prefetched (64 bytes step) : 8250.8 MB/s (3.1%) | |
| C fill : 12834.6 MB/s (0.8%) | |
| C fill (shuffle within 16 byte blocks) : 12822.7 MB/s (1.9%) | |
| C fill (shuffle within 32 byte blocks) : 12826.7 MB/s (2.2%) | |
| C fill (shuffle within 64 byte blocks) : 12806.8 MB/s | |
| --- | |
| standard memcpy : 14974.4 MB/s (0.4%) | |
| standard memset : 13742.2 MB/s (6.3%) | |
| --- | |
| MOVSB copy : 7307.0 MB/s (1.5%) | |
| MOVSD copy : 7290.8 MB/s (1.4%) | |
| SSE2 copy : 9250.9 MB/s (0.9%) | |
| SSE2 nontemporal copy : 15054.3 MB/s (0.7%) | |
| SSE2 copy prefetched (32 bytes step) : 9065.2 MB/s (2.4%) | |
| SSE2 copy prefetched (64 bytes step) : 9003.7 MB/s (1.8%) | |
| SSE2 nontemporal copy prefetched (32 bytes step) : 15406.7 MB/s (1.9%) | |
| SSE2 nontemporal copy prefetched (64 bytes step) : 15389.3 MB/s (1.6%) | |
| SSE2 2-pass copy : 8449.3 MB/s (1.6%) | |
| SSE2 2-pass copy prefetched (32 bytes step) : 8437.4 MB/s (1.6%) | |
| SSE2 2-pass copy prefetched (64 bytes step) : 8513.8 MB/s (1.3%) | |
| SSE2 2-pass nontemporal copy : 4379.0 MB/s (2.2%) | |
| SSE2 fill : 13800.1 MB/s (1.4%) | |
| SSE2 nontemporal fill : 18970.6 MB/s (0.4%) | |
| ========================================================================== | |
| == Memory latency test == | |
| == == | |
| == Average time is measured for random memory accesses in the buffers == | |
| == of different sizes. The larger is the buffer, the more significant == | |
| == are relative contributions of TLB, L1/L2 cache misses and SDRAM == | |
| == accesses. For extremely large buffer sizes we are expecting to see == | |
| == page table walk with several requests to SDRAM for almost every == | |
| == memory access (though 64MiB is not nearly large enough to experience == | |
| == this effect to its fullest). == | |
| == == | |
| == Note 1: All the numbers are representing extra time, which needs to == | |
| == be added to L1 cache latency. The cycle timings for L1 cache == | |
| == latency can be usually found in the processor documentation. == | |
| == Note 2: Dual random read means that we are simultaneously performing == | |
| == two independent memory accesses at a time. In the case if == | |
| == the memory subsystem can't handle multiple outstanding == | |
| == requests, dual random read has the same timings as two == | |
| == single reads performed one after another. == | |
| ========================================================================== | |
| block size : single random read / dual random read, [MADV_NOHUGEPAGE] | |
| 1024 : 0.0 ns / 0.0 ns | |
| 2048 : 0.0 ns / 0.0 ns | |
| 4096 : 0.0 ns / 0.0 ns | |
| 8192 : 0.0 ns / 0.0 ns | |
| 16384 : 0.0 ns / 0.0 ns | |
| 32768 : 0.0 ns / 0.0 ns | |
| 65536 : 1.0 ns / 1.4 ns | |
| 131072 : 1.4 ns / 1.7 ns | |
| 262144 : 1.7 ns / 1.8 ns | |
| 524288 : 3.2 ns / 4.0 ns | |
| 1048576 : 6.3 ns / 7.9 ns | |
| 2097152 : 7.8 ns / 9.0 ns | |
| 4194304 : 8.8 ns / 9.4 ns | |
| 8388608 : 9.7 ns / 9.7 ns | |
| 16777216 : 23.6 ns / 34.9 ns | |
| 33554432 : 67.3 ns / 95.8 ns | |
| 67108864 : 89.4 ns / 117.5 ns | |
| block size : single random read / dual random read, [MADV_HUGEPAGE] | |
| 1024 : 0.0 ns / 0.0 ns | |
| 2048 : 0.0 ns / 0.0 ns | |
| 4096 : 0.0 ns / 0.0 ns | |
| 8192 : 0.0 ns / 0.0 ns | |
| 16384 : 0.0 ns / 0.0 ns | |
| 32768 : 0.0 ns / 0.0 ns | |
| 65536 : 0.9 ns / 1.3 ns | |
| 131072 : 1.4 ns / 1.7 ns | |
| 262144 : 1.6 ns / 1.8 ns | |
| 524288 : 1.8 ns / 1.9 ns | |
| 1048576 : 4.8 ns / 6.4 ns | |
| 2097152 : 6.4 ns / 7.7 ns | |
| 4194304 : 7.5 ns / 8.1 ns | |
| 8388608 : 7.9 ns / 8.7 ns | |
| 16777216 : 11.6 ns / 12.3 ns | |
| 33554432 : 60.2 ns / 86.8 ns | |
| 67108864 : 83.7 ns / 106.9 ns |
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