import json
import sys
import pynvml 
import time
import psutil

UNIT = 1024 * 1024 * 1024

def gpu_status(output_path = "./results/gpu_status", print_status = False):
    pynvml.nvmlInit()
    gpuDeviceCount = pynvml.nvmlDeviceGetCount()
    start_time = time.time()
    first_loop = True
    
    while time.time() - start_time < 3600 *24:
        # print(time.time() - start_time)
        all_gpu_status = []
        for i in range(gpuDeviceCount):
            handle = pynvml.nvmlDeviceGetHandleByIndex(i)
            memoryInfo = pynvml.nvmlDeviceGetMemoryInfo(handle)
            all_gpu_status.append(dict(
                device = i,
                total_mem_GB = memoryInfo.total/UNIT,
                used_mem_GB = memoryInfo.used/UNIT,
                powerusage_W = pynvml.nvmlDeviceGetPowerUsage(handle) / 1000
            ))
        
        all_processes_status = []
        pidAllInfo = pynvml.nvmlDeviceGetComputeRunningProcesses(handle)
        for pidInfo in pidAllInfo:
            pidUser = psutil.Process(pidInfo.pid).username()
            pidCreateTime = psutil.Process(pidInfo.pid).create_time()
            pidName = psutil.Process(pidInfo.pid).name()
            all_processes_status.append(dict(
                pid = pidInfo.pid,
                create_time = pidCreateTime,
                name = pidName,
                user = pidUser,
                used_mem_GB = pidInfo.usedGpuMemory/UNIT
            ))

        logs = dict(
            cur_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),
            all_gpu_status = all_gpu_status,
            all_processes_status =  all_processes_status
        )

        with open(f"{output_path}/gpu_status.json", "a", encoding="utf-8") as f:
            f.write(json.dumps(logs) + "\n")
        
        if first_loop:
            print("Start run gpu_status.py")
            first_loop = False
            
        if print_status:
            print(logs)

        time.sleep(60)
        
    pynvml.nvmlShutdown()

def main():
    output_path = sys.argv[1]
    print_status = sys.argv[2]
    gpu_status(output_path, print_status)

if __name__ == "__main__":
    main()