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本文來源電子發(fā)燒友社區(qū)，作者：李先生，帖子地址：https://bbs.elecfans.com/jishu_2308803_1_1.html

前言

嵌入式平臺(tái)存儲(chǔ)是影響綜合性能的重要因素，所以本次對(duì)RAM和EMM性能進(jìn)行測試，RAM壓力測試也是一個(gè)重要的測試用例，尤其是在高低溫等情況下測試，可以考察系統(tǒng)的穩(wěn)定性。

過程RAM性能測試

WSL中

下載代碼

git clonehttps://github.com/qinyunti/STREAM.git

cd STREAM/

編譯

ARM-linux-gnueabihf-gcc -O3 stream.c -o stream

導(dǎo)出到windows下

cp stream /mnt/d

然后通過串口rz導(dǎo)入到開發(fā)板

添加可執(zhí)行權(quán)限

chmod +x stream

運(yùn)行

./stream

結(jié)果如下

[root@EASY-EAI-NANO:/]# ./stream
-------------------------------------------------------------
STREAM version $Revision: 5.10 $
-------------------------------------------------------------
This system uses 8 bytes per array element.
-------------------------------------------------------------
Array size = 10000000 (elements), Offset = 0 (elements)
Memory per array = 76.3 MiB (= 0.1 GiB).
Total memory required = 228.9 MiB (= 0.2 GiB).
Each kernel will be executed 10times.
The *best* time for each kernel (excluding the first iteration)
will be used to compute the reported bandwidth.
-------------------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds.
Each test below will take on the order of 74402 microseconds.
(= 74402 clock ticks)
Increase the size of the arrays if this shows that
you are not getting at least 20 clock ticks per test.
-------------------------------------------------------------
WARNING -- The above is only a rough guideline.
For best results, please be sure you know the
precision of your system timer.
-------------------------------------------------------------
Function Best Rate MB/sAvg time Min time Max time
Copy: 2213.1 0.072951 0.072296 0.073413
Scale: 1526.0 0.105517 0.104846 0.108350
Add: 1181.8 0.203954 0.203082 0.205791
Triad: 954.5 0.253434 0.251431 0.255541
-------------------------------------------------------------
Solution Validates: avg error less than 1.000000e-13 on all three arrays
-------------------------------------------------------------
[root@EASY-EAI-NANO:/]#

復(fù)制代碼

參考https://www.cs.virginia.edu/stream/ref.html

RAM壓力測試

參考https://pyropus.ca./software/memtester/

WSL中

下載代碼

wgethttps://pyropus.ca./software/mem ... tester-4.5.1.tar.gz

tar -xvf memtester-4.5.1.tar.gz

cd memtester-4.5.1/

編譯

arm-linux-gnueabihf-gcc -O3 memtester.c tests.c -o memtester

導(dǎo)出到WINDOWS下,下載到開發(fā)板

cp memtester /mnt/d

chmod +x memtester

運(yùn)行

./memtester

運(yùn)行結(jié)果如下,默認(rèn)一直測試下去,可以最后指定測試次數(shù)

比如

./memtester128M 1

128M表示測試RAM大小

1表示測試一次

另外也可以-p直接指定物理地址,適合在板子開發(fā)階段裸機(jī)代碼直接指定物理地址測試。

[root@EASY-EAI-NANO:/]# ./memtester 128M 1
memtester version 4.5.1 (32-bit)
Copyright (C) 2001-2020 Charles Cazabon.
Licensed under the GNU General Public License version 2 (only).
pagesize is 4096
pagesizemask is 0xfffff000
want 128MB (134217728 bytes)
got128MB (134217728 bytes), trying mlock ...locked.
Loop 1/1:
Stuck Address : ok
Random Value : ok
Compare XOR : ok
Compare SUB : ok
Compare MUL : ok
Compare DIV : ok
Compare OR : ok
Compare AND : ok
Sequential Increment: ok
Solid Bits : ok
Block Sequential : ok
Checkerboard : ok
Bit Spread : ok
Bit Flip : ok
Walking Ones : ok
Walking Zeroes : ok
Done.

復(fù)制代碼

EMMC性能測試

dmesg | grep mmc

4GEMMC

[ 0.626234] mmc0: new HS200 MMC card at address 0001

[ 0.628264] mmcblk0: mmc0:0001 8GTF4R 7.28 GiB

EMMC速度為HS200

Speed Mode	clock (MHz)
Default Speed	26
Hight Speed SDR	52
Hight Speed DDR	52
HS200	200
HS400	200

df查看,使用/userdata目錄進(jìn)行讀寫測試

[root@EASY-EAI-NANO:/]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 1531442 593804 86391741% /
devtmpfs 456488 0 456488 0% /dev
tmpfs 457000 0 457000 0% /dev/shm
tmpfs 457000 204 456796 0% /tmp
tmpfs 457000 380 456620 0% /run
/dev/mmcblk0p7 127955 1684 122289 1% /oem
/dev/mmcblk0p8 5632783 38040 5370524 1% /userdata

復(fù)制代碼

	bs/count1GB	指令	結(jié)果
讀	16k/65536	timedd if=/userdata/test.bin of=/dev/null bs=16k count=65536	109MB/S
	4k/262144
	1k/1048576
寫	16k/65536	timedd if=/dev/zero of=/userdata/test.bin bs=16k count=65536	38MB/S
	4k/262144
	1k/1048576

[root@EASY-EAI-NANO:/]# time dd if=/dev/zero of=/userdata/test.bin bs=16k count=
65536
65536+0 records in
65536+0 records out
real 0m 26.85s
user 0m 0.08s
sys 0m 16.77s
[root@EASY-EAI-NANO:/]# time dd if=/userdata/test.bin of=/dev/null bs=16k count=
65536
65536+0 records in
65536+0 records out
real 0m 9.36s
user 0m 0.10s
sys 0m 4.54s
[root@EASY-EAI-NANO:/]#

復(fù)制代碼

以上僅作參考，實(shí)際欸有考慮緩存的影響。

SD卡性能測試

同EMMC測試,測試過程略。

SD卡自動(dòng)掛載在/mnt/sdcard

總結(jié)

以上測試來看，性能是不錯(cuò)的，測試方法不是完全科學(xué)，比如EMMC讀寫沒有考慮緩存，所以測試結(jié)果僅作參考。不同測試環(huán)境結(jié)果也可能不一樣。

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