add fft benchmarks

Author: scivision

fft/check_ram.m

@@ -0,0 +1,27 @@
+function check_ram(expected_bytes, mem_avail)
+arguments
+  expected_bytes (1,1) {mustBeInteger,mustBePositive}
+  mem_avail {mustBeScalarOrEmpty} = []
+end
+
+if isempty(mem_avail)
+  m = memory();
+  mem_avail = m.MaxPossibleArrayBytes; % set available memory to maximum possible
+end
+
+% get user set preference for memory limit
+s = settings;
+ws = s.matlab.desktop.workspace;
+
+% Check if the maximum array size limit is enabled
+if ws.ArraySizeLimitEnabled.ActiveValue
+  limit_bytes = double(ws.ArraySizeLimit.ActiveValue) / 100 * stdlib.ram_total();
+else
+  limit_bytes = inf; % no limit set
+end
+
+limit_bytes = min(limit_bytes, mem_avail);
+
+assert(expected_bytes < limit_bytes, "expected array bytes %d too big for memory %d", expected_bytes, mem_avail)
+
+end