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root@pinebook:~# 7z b 7-Zip 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18 p7zip Version 9.20 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,4 CPUs) RAM size: 1989 MB, # CPU hardware threads: 4 RAM usage: 850 MB, # Benchmark threads: 4 Dict Compressing | Decompressing Speed Usage R/U Rating | Speed Usage R/U Rating KB/s % MIPS MIPS | KB/s % MIPS MIPS 22: 1363 290 456 1326 | 40210 389 933 3627 23: 1312 290 461 1336 | 38584 380 929 3530 24: 1305 299 469 1404 | 38616 387 926 3582 25: 1265 304 475 1445 | 37719 386 918 3547 ---------------------------------------------------------------- Avr: 296 465 1378 385 926 3572 Tot: 341 696 2475 root@pinebook:~/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 : 971.2 MB/s (3.6%) C copy backwards (32 byte blocks) : 973.5 MB/s (2.1%) C copy backwards (64 byte blocks) : 973.5 MB/s (2.8%) C copy : 974.6 MB/s (2.5%) C copy prefetched (32 bytes step) : 769.2 MB/s (2.0%) C copy prefetched (64 bytes step) : 894.2 MB/s (1.8%) C 2-pass copy : 934.8 MB/s C 2-pass copy prefetched (32 bytes step) : 692.0 MB/s (2.0%) C 2-pass copy prefetched (64 bytes step) : 469.0 MB/s (3.5%) C fill : 3092.4 MB/s (1.2%) C fill (shuffle within 16 byte blocks) : 3093.2 MB/s (1.3%) C fill (shuffle within 32 byte blocks) : 3092.7 MB/s C fill (shuffle within 64 byte blocks) : 3090.2 MB/s (3.7%) --- standard memcpy : 887.4 MB/s (2.8%) standard memset : 3087.6 MB/s (4.3%) --- NEON LDP/STP copy : 991.9 MB/s (1.9%) NEON LDP/STP copy pldl2strm (32 bytes step) : 720.8 MB/s (1.5%) NEON LDP/STP copy pldl2strm (64 bytes step) : 883.1 MB/s NEON LDP/STP copy pldl1keep (32 bytes step) : 1036.8 MB/s (2.3%) NEON LDP/STP copy pldl1keep (64 bytes step) : 1035.9 MB/s (1.4%) NEON LD1/ST1 copy : 994.8 MB/s (1.1%) NEON STP fill : 3094.3 MB/s (0.9%) NEON STNP fill : 2138.6 MB/s (11.3%) ARM LDP/STP copy : 994.5 MB/s (2.0%) ARM STP fill : 3095.2 MB/s (1.0%) ARM STNP fill : 2182.0 MB/s (6.5%) ========================================================================== == Framebuffer read tests. == == == == Many ARM devices use a part of the system memory as the framebuffer, == == typically mapped as uncached but with write-combining enabled. == == Writes to such framebuffers are quite fast, but reads are much == == slower and very sensitive to the alignment and the selection of == == CPU instructions which are used for accessing memory. == == == == Many x86 systems allocate the framebuffer in the GPU memory, == == accessible for the CPU via a relatively slow PCI-E bus. Moreover, == == PCI-E is asymmetric and handles reads a lot worse than writes. == == == == If uncached framebuffer reads are reasonably fast (at least 100 MB/s == == or preferably >300 MB/s), then using the shadow framebuffer layer == == is not necessary in Xorg DDX drivers, resulting in a nice overall == == performance improvement. For example, the xf86-video-fbturbo DDX == == uses this trick. == ========================================================================== NEON LDP/STP copy (from framebuffer) : 148.4 MB/s NEON LDP/STP 2-pass copy (from framebuffer) : 142.2 MB/s (0.4%) NEON LD1/ST1 copy (from framebuffer) : 37.8 MB/s NEON LD1/ST1 2-pass copy (from framebuffer) : 37.4 MB/s (0.3%) ARM LDP/STP copy (from framebuffer) : 75.2 MB/s (0.5%) ARM LDP/STP 2-pass copy (from framebuffer) : 73.5 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 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 : 5.9 ns / 10.0 ns 131072 : 9.1 ns / 13.9 ns 262144 : 10.7 ns / 15.5 ns 524288 : 13.0 ns / 18.1 ns 1048576 : 111.9 ns / 174.1 ns 2097152 : 162.3 ns / 225.3 ns 4194304 : 196.0 ns / 250.0 ns 8388608 : 215.2 ns / 259.8 ns 16777216 : 227.1 ns / 264.8 ns 33554432 : 234.0 ns / 268.1 ns 67108864 : 238.6 ns / 270.3 ns
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