use java to get RAM free, total and CPU load

Author: scivision

+stdlib/+sys/checkRAM.m

@@ -12,7 +12,7 @@
 end
 
 % get available RAM
-freebytes = stdlib.sys.memfree();
+freebytes = stdlib.sys.ram_free();
 % variable sizing
 switch(myclass)
   case {'single','int32','uint32'}, bits = 32;

+stdlib/+sys/cpu_load.m

@@ -0,0 +1,13 @@
+function L = cpu_load()
+%% CPU_LOAD get total physical CPU load
+% https://docs.oracle.com/javase/9/docs/api/com/sun/management/OperatingSystemMXBean.html#getSystemCpuLoad--
+% Returns the "recent cpu usage" for the whole system.
+% This value is a double in the [0.0,1.0] interval.
+% A value of 0.0 means that all CPUs were idle during the recent period of time observed, while a value of 1.0 means that all CPUs were actively running 100% of the time during the recent period being observed.
+% All values betweens 0.0 and 1.0 are possible depending of the activities going on in the system.
+% If the system recent cpu usage is not available, the method returns a negative value.
+
+b = java.lang.management.ManagementFactory.getOperatingSystemMXBean();
+L = b.getSystemCpuLoad();
+
+end

+stdlib/+sys/memfree.m

@@ -0,0 +1,14 @@
+function freebytes = ram_free()
+%% ram_free()
+% get free physical RAM across operating systems
+% Ref: https://docs.oracle.com/javase/9/docs/api/com/sun/management/OperatingSystemMXBean.html
+%
+%%% Outputs
+% * freebytes: free physical RAM [bytes]
+
+
+b = java.lang.management.ManagementFactory.getOperatingSystemMXBean();
+
+freebytes = b.getFreePhysicalMemorySize();
+
+end

+stdlib/+sys/ram_free.m

@@ -0,0 +1,14 @@
+function bytes = ram_total()
+%% ram_total()
+% get total physical RAM across operating systems
+% Ref: https://docs.oracle.com/javase/9/docs/api/com/sun/management/OperatingSystemMXBean.html
+%
+%%% Outputs
+% * bytes: total physical RAM [bytes]
+
+
+b = java.lang.management.ManagementFactory.getOperatingSystemMXBean();
+
+bytes = b.getTotalPhysicalMemorySize();
+
+end

+stdlib/+sys/ram_total.m

@@ -13,8 +13,6 @@ function setup_path(tc)
 methods (Test)
 
 function test_checkRAM(tc)
-pe = pyenv;
-tc.assumeFalse(pe.Version == "", "Python not available")
 tc.assertTrue(islogical(stdlib.sys.checkRAM(1)))
 end
 
@@ -25,9 +23,7 @@ function test_diskfree(tc)
 end
 
 function test_memory(tc)
-pe = pyenv;
-tc.assumeFalse(pe.Version == "", "Python not available")
-tc.assertTrue(isnumeric(stdlib.sys.memfree))
+tc.assertTrue(isnumeric(stdlib.sys.ram_free))
 end
 
 end