Why memory usage not change when add different input with GGML format

[SiraHaruethaipree]

I don't know too much about GGML format. But I know memory usage in vram GPU was changed depending on input sequence if input is long sequence it will increase the memory usage like when I test with load_8_bit or load_4_bit method from huggingface. So I need to know how memory usage is always the same value when use GGML format with GPU. Please someone explain.
Thanks