"Current memory usage" is the phrase that is commonly used to refer to the amount of memory that is currently being used by a device or system.
The phrase "current memory usage" refers to the amount of memory that is being used at the present moment, as opposed to the total amount of memory that is available for use or the amount of memory that has been used in the past.
Here are a few examples of sentences that use the phrase "current memory usage" in context, along with their translations:
"I checked the current memory usage on my computer and saw that it was at 75% capacity." (我检查了电脑的目前内存使用情况，发现它已经达到了75%的容量。)
"The current memory usage on this phone is causing it to run slow." (这手机目前的内存使用情况导致它运行缓慢。)
"I'm trying to free up some space on my device by closing apps and reducing the current memory usage." (我正在通过关闭应用程序并减少目前的内存使用情况来腾出一些空间。)