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unit systemunit;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Math;
function cpuUtilization: extended;
function numCpus: int64;
function momentanFreieCpus: int64;
function belegterSpeicher: int64;
function minCache: int64;
implementation
var _cpuLastUsed,_cpuLastIdle: int64;
function cpuUtilization: extended;
var
procstat: textfile;
s: string;
used,idle: int64;
i: integer;
begin
result:=0;
s:='';
assignfile(procstat,'/proc/stat');
reset(procstat);
while not eof(procstat) do begin
readln(procstat,s);
if pos('cpu ',s)=1 then break;
end;
closefile(procstat);
if pos('cpu ',s)<>1 then exit;
delete(s,1,pos(' ',s));
s:=trim(s);
used:=0;
idle:=0;
for i:=0 to 3 do begin
used:=used+idle;
idle:=strtoint(copy(s,1,pos(' ',s)-1));
delete(s,1,pos(' ',s));
s:=trim(s);
end;
result:=(used-_cpuLastUsed)/max(1,used-_cpuLastUsed + idle-_cpuLastIdle);
_cpuLastUsed:=used;
_cpuLastIdle:=idle;
end;
function numCpus: int64;
var
procstat: textfile;
s: string;
begin
result:=0;
s:='';
assignfile(procstat,'/proc/stat');
reset(procstat);
while not eof(procstat) do begin
readln(procstat,s);
if (pos('cpu',s)=1) and
(pos('cpu ',s)<>1) then
inc(result);
end;
closefile(procstat);
end;
function momentanFreieCpus: int64;
begin
result:=floor(numCpus*(1-cpuUtilization));
end;
function belegterSpeicher: int64;
var f: textFile;
s: string;
begin
s:='/proc/'+inttostr(getProcessId)+'/smaps';
result:=0;
if not fileexists(s) then exit;
assignfile(f,s);
reset(f);
while not eof(f) do begin
readln(f,s);
if (leftStr(s,4)='Rss:') and (rightStr(s,3)=' kB') then begin
delete(s,1,4);
delete(s,length(s)-2,3);
s:=trim(s);
result:=result+strtoint(s);
end;
end;
closefile(f);
end;
function minCache: int64;
var f: textFile;
s: string;
begin
s:='/proc/cpuinfo';
result:=0;
if not fileexists(s) then exit;
assignfile(f,s);
reset(f);
while not eof(f) do begin
readln(f,s);
if (leftStr(s,10)='cache size') and (rightStr(s,3)=' kB') then begin
delete(s,1,pos(':',s));
delete(s,length(s)-2,3);
s:=trim(s);
if result=0 then result:=strtoint(s)
else result:=min(result,strtoint(s));
end;
end;
closefile(f);
end;
begin
_cpuLastUsed:=0;
_cpuLastIdle:=0;
cpuUtilization;
end.
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