copyfile

test.py

import sys
import time
import os
import multiprocessing

SRC_FILE = '/home/myuser/test/cp/orig/a.zip'
DST_FILE = '/home/myuser/test/cp/1/a.zip'

try:
    O_BINARY = os.O_BINARY
except:
    O_BINARY = 0

READ_FLAGS = os.O_RDONLY | O_BINARY
WRITE_FLAGS = os.O_WRONLY | os.O_CREAT | os.O_TRUNC | O_BINARY
BUFFER_SIZE = 128*1024

def copy_file(src, dst=[], progress=None, only_new_file=True):
    out_files = dict.fromkeys(dst)

    if only_new_file:
        # copy only newer files
        out_files = []
        src_modified = time.ctime(os.path.getmtime(src))
        for dest in dst:
            if os.path.exists(dest):
                dest_modified = time.ctime(os.path.getmtime(dest))
                if src_modified > dest_modified:
                    out_files.append(dest)
            else:
                out_files.append(dest)
        out_files = dict.fromkeys(out_files)
    try:
        size = os.path.getsize(src)
        fin = os.open(src, READ_FLAGS)
        stat = os.fstat(fin)
        for dst_file in out_files:
                out_files[dst_file] = os.open(dst_file, WRITE_FLAGS, stat.st_mode)

        for x in iter(lambda: os.read(fin, BUFFER_SIZE), ""):
            workers = []
            for dst_file in out_files:
                workers.append(multiprocessing.Process(target=copy_worker, args=(x,out_files[dst_file],)))
            for worker in  workers:
                worker.start()
            for worker in  workers:
                worker.join()

    finally:
        try: os.close(fin)
        except: pass
        try:
            for key in out_files:
                os.close(out_files[key])
        except: pass


def copy_worker(stream, fout):
    os.write(fout, stream)
    return


if __name__ == '__main__':

    initTime = time.time()
    copy_file(SRC_FILE, [DST_FILE], only_new_file=False)
    print time.time() - initTime

    time.sleep(5)

    from PyQt5.QtWidgets import QApplication, QWidget

    app = QApplication(sys.argv)

    w = QWidget()
    w.resize(250, 150)
    w.move(300, 300)
    w.setWindowTitle('Simple')
    w.show()

    initTime = time.time()
    copy_file(SRC_FILE, [DST_FILE], only_new_file=False)
    print time.time() - initTime

    sys.exit(app.exec_())