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February 14, 2018 06:56
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| 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 : 1626.6 MB/s (2.6%) | |
| C copy backwards (32 byte blocks) : 1619.8 MB/s (2.1%) | |
| C copy backwards (64 byte blocks) : 1623.2 MB/s (2.4%) | |
| C copy : 1634.7 MB/s (1.4%) | |
| C copy prefetched (32 bytes step) : 1142.4 MB/s (3.3%) | |
| C copy prefetched (64 bytes step) : 1076.1 MB/s (0.1%) | |
| C 2-pass copy : 1289.4 MB/s | |
| C 2-pass copy prefetched (32 bytes step) : 928.6 MB/s | |
| C 2-pass copy prefetched (64 bytes step) : 1044.8 MB/s (0.2%) | |
| C fill : 5389.0 MB/s | |
| C fill (shuffle within 16 byte blocks) : 5391.8 MB/s | |
| C fill (shuffle within 32 byte blocks) : 5391.1 MB/s | |
| C fill (shuffle within 64 byte blocks) : 5391.7 MB/s | |
| --- | |
| standard memcpy : 1718.7 MB/s (0.3%) | |
| standard memset : 5406.8 MB/s | |
| --- | |
| NEON LDP/STP copy : 1734.8 MB/s (0.5%) | |
| NEON LDP/STP copy pldl2strm (32 bytes step) : 1055.0 MB/s (0.8%) | |
| NEON LDP/STP copy pldl2strm (64 bytes step) : 1313.6 MB/s (0.4%) | |
| NEON LDP/STP copy pldl1keep (32 bytes step) : 1866.2 MB/s | |
| NEON LDP/STP copy pldl1keep (64 bytes step) : 1868.8 MB/s | |
| NEON LD1/ST1 copy : 1681.0 MB/s (0.7%) | |
| NEON STP fill : 5405.0 MB/s | |
| NEON STNP fill : 5296.7 MB/s (0.1%) | |
| ARM LDP/STP copy : 1717.2 MB/s (0.3%) | |
| ARM STP fill : 5407.0 MB/s | |
| ARM STNP fill : 5294.4 MB/s (0.3%) | |
| ========================================================================== | |
| == 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 / 0.1 ns | |
| 65536 : 6.8 ns / 11.5 ns | |
| 131072 : 10.4 ns / 15.9 ns | |
| 262144 : 12.3 ns / 17.7 ns | |
| 524288 : 14.2 ns / 19.9 ns | |
| 1048576 : 83.9 ns / 127.2 ns | |
| 2097152 : 121.5 ns / 162.2 ns | |
| 4194304 : 148.8 ns / 185.5 ns | |
| 8388608 : 163.7 ns / 197.5 ns | |
| 16777216 : 173.0 ns / 206.5 ns | |
| 33554432 : 177.5 ns / 212.7 ns | |
| 67108864 : 181.1 ns / 217.3 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 / 0.1 ns | |
| 65536 : 6.8 ns / 11.6 ns | |
| 131072 : 10.4 ns / 16.2 ns | |
| 262144 : 12.2 ns / 18.2 ns | |
| 524288 : 14.2 ns / 19.9 ns | |
| 1048576 : 83.8 ns / 127.2 ns | |
| 2097152 : 121.0 ns / 161.6 ns | |
| 4194304 : 139.5 ns / 173.0 ns | |
| 8388608 : 149.4 ns / 177.3 ns | |
| 16777216 : 154.7 ns / 179.1 ns | |
| 33554432 : 157.2 ns / 179.8 ns | |
| 67108864 : 158.5 ns / 180.2 ns |
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