Obtaining of virtual memory, RAM and CPU usage by the whole system or by single process.
Currently works on Linux and Windows.
FreeBSD support is partial - only system-wide memory information and per-process CPU usage can be retrieved now.
Ddoc:
dub build --build=docs
Ddox:
dub build --build=ddox
// import moduleimport resusage.memory;
// or the whole packageimport resusage;
// get system memory usage
SystemMemInfo sysMemInfo = systemMemInfo(); // access properties
sysMemInfo.totalRAM;
sysMemInfo.usedRAM;
sysMemInfo.freeRAM;
sysMemInfo.totalVirtMem;
sysMemInfo.usedVirtMem;
sysMemInfo.freeVirtMem;
// actualize values after some amount of time
sysMemInfo.update();
// get memory usage of the current process
ProcessMemInfo procMemInfo = processMemInfo();
// or pass process ID to get info about specific processint pid = ...;
ProcessMemInfo procMemInfo = processMemInfo(pid);
// access properties
procMemInfo.usedVirtMem;
procMemInfo.usedRAM;
// actualize values after some amount of time
procMemInfo.update();
//import moduleimport resusage.cpu;
// create watcher to watch system CPUauto cpuWatcher = new SystemCPUWatcher();
// get actual value when neededdouble percent = cpuWatcher.current();
// create CPU watcher for current processauto cpuWatcher = new ProcessCPUWatcher();
// or for process with given idint pid = ...;
auto cpuWatcher = new ProcessCPUWatcher(pid);
// get actual value when neededdouble percent = cpuWatcher.current();Prints total amount of virtual and physical memory (in bytes) and their current usage in the system (in percents).
dub examples/totalusage.d
Prints amount of virtual and physical memory currently used by process, in bytes.
dub examples/processusage.d `pidof process`
All following examples show CPU time used by a system or by a process in the 0-100% range.
Watch system CPU time:
dub examples/cpuwatcher.d
Watch process CPU time:
dub examples/cpuwatcher.d `pidof process`
Spawn process and watch for its CPU time:
dub examples/cpuwatcher.d --spawn firefox
Adjust the rate of output:
dub examples/cpuwatcher.d --rate=1 --spawn firefox
Consume CPU time and report CPU usage by this process:
dub examples/cpuselfwatcher --threads=2
E.g. if you have 4 cores and run this example with 2 threads it will report 50% CPU time.
In order to provide some functionality resusage dynamically loads the following libraries at startup:
- Psapi.dll for GetProcessMemoryInfo.
- Pdh.dll to calculate CPU time used by system.
If Psapi.dll or Pdh.dll could not be loaded, corresponding functions will always throw WindowsException.
Uses sysinfo, clock_gettime and proc stats.
Uses sysctl to get RAM and libkvm to get swap memory to calculate virtual memory. Uses clock_gettime to evaluate CPU usage.