What is the difference between "DRAM" and "Gl

Dear All,

In order to get information of my application memory bandwidth between GPU chip
and Global Device memory on my GPU using pgprof command,
I typed “pgprof --query-metrics” and I found out as follows.

dram_read_throughput: Device memory read throughput

dram_write_throughput: Device memory write throughput

gst_throughput: Global memory store throughput

gld_throughput: Global memory load throughput

What is the difference between “dram_read_throughput” and “gld_throughput” ?
Which should I use to get the information ?

Sincerely yours,