如何测量在Android VRAM消费？ [英] How to measure VRAM consumption on Android?
问题描述
我想要获取Android设备VRAM大小。
I want to acquire Android Device VRAM size.
是否有从计划收购的方法？
Is there a method for acquisition from the program?
推荐答案
让我们通过做一些计算的Nexus One：
Let's do some calculation using Nexus One:
屏幕分辨率480x800的是。所以最低要求的显存大小为：结果
400 * 800 * 4 =字节字节1536000
Screen resolution is 480x800. So minimum required video memory size would be:
400 * 800 * 4 bytes = 1536000 bytes
假设驱动程序可能（按理说应该）使用几个缓冲区，我们也应该期望像值：
Assuming that driver may (and normally should) use several buffers, we should also expect values like:
1536000 * 2字节= 3072000字节结果 1536000 * 3字节= 4608000字节结果等等...
这将是不可思议有不在的1536000（或宽x高，一般×4）多个值。
It would be weird to have values that are not multiple of 1536000 (or W x H x 4 in general).
在Android上的内部一些搜索，我发现这个<一个href=\"http://www.netmite.com/android/mydroid/development/pdk/docs/display_drivers.html\">documentation
After some searches on Android internals I've found this documentation :
... Android的使司机的两个要求：可映射内存的线性地址空间，它可以写...直接通过调用在/ dev / fb0设备...
...Android makes two requirements of the driver: a linear address space of mappable memory that it can write to directly...accessing the driver by calling open on /dev/fb0...
所以，我想，采取的/ dev /图形/ FB0 文件的大小（我的设备上没有的/ dev / fb0设备）。
So I tried and take size of /dev/graphics/fb0 file (on my device there is no /dev/fb0).
但直接的方法是行不通的：
But a direct approach doesn't work:
File file = new File("/dev/graphics/fb0");
file.length(); // ==0, doesn't work, no read access
使用下一个技巧，你可以得到的 FB0 实际尺寸：结果
＆GT;亚洲开发银行拉的/ dev /图形/ FB0 结果
1659 KB /秒（在2.712s 4608000字节）
视频内存4MB〜（歌Nexus One）。让我们来看看，如果这是的Nexus屏幕尺寸的多：
Video memory is ~4mb (Nexus One). Let's check if this is multiple of Nexus screen size:
一百五十三万六千分之四百六十万八千= 3
它看起来像一个正确的价值。而且我们也可以说，驱动程序使用的三的屏幕缓冲。
It looks like a right value. And we also can say that driver uses three screen buffers.
所以，作为一个结论，你可以使用亚行检测显存大小，但不能在适当的文件访问限制运行时使用这种方法从你的Android应用程序。
So, as a conclusion, you can detect video memory size using adb, but you can't use this approach from your android application in runtime due to file access restrictions.
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