<pre style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", Courier, monospace; font-size: 12px; white-space: pre; margin: 0px; padding: 12px; display: block; overflow: auto; line-height: 1.4;">m = memory_map(filen...
import mmap with open('test.txt', "r+b") as f: # memory-map the file, size 0 means whole file with mmap.mmap(f.fileno(), 0) as mm: # read content via standard file methods print(mm.read()) # read content via slice notation snippet = mm[0:10] print(snippet.decode('utf-8...
This is where memory mapping comes into play. Remove ads Memory Mapping Optimizations One way to avoid this overhead is to use a memory-mapped file. You can picture memory mapping as a process in which read and write operations skip many of the layers mentioned above and map the requested ...
# memory-map the file, size 0 means whole file map = mmap.mmap(f.fileno(), length=0, access=mmap.ACCESS_READ) count = 0 while map.readline(): count += 1 print(count) map.close() print(time.time() - start) 输出: 5000 0.023865938186645508 6、可以不按行读取,而是按块读取,然后分析\...
importmmapimportostargetfile=r'd:\dev\gotoolkits\resources\mmapshare.txt'defmemory_map(filename,access=mmap.ACCESS_WRITE):size=os.path.getsize(filename)fd=os.open(filename,os.O_RDWR)returnmmap.mmap(fd,size,access=access)mp=memory_map(targetfile)mp.seek(round(mp.size()/2))whileTrue:job...
classFile:def__init__(self,filename):self.filename=filename def__enter__(self):print('Enter')self.file=open(self.filename,'r')returnself.file def__exit__(self,exc_type,exc_value,traceback):print('Exit')self.file.close()withFile('file.txt')as f:data=f.read() ...
thousands=None, decimal=b'.', lineterminator=None, quotechar='"', quoting=0, doublequote=True, escapechar=None, comment=None, encoding=None, dialect=None, tupleize_cols=None, error_bad_lines=True, warn_bad_lines=True, delim_whitespace=False, low_memory=True, memory_map=False, float_precis...
内存映射(Memory Map) 内存映射就是把物理内存映射到进程的地址空间之内,这些应用程序就可以直接使用输入输出的地址空间。 使用内存映射文件处理存储于磁盘上的文件时,将不需要由应用程序对文件执行I/O操作,这意味着在对文件进行处理时将不必再为文件申请并分配缓存,所有的文件缓存操作均由系统直接管理,由于取消了将文...
memory_maps() [pmmap_grouped(path='/lib/x8664-linux-gnu/libutil-2.15.so', rss=32768, size=2125824, pss=32768, shared_clean=0, shared_dirty=0, private_clean=20480, private_dirty=12288, referenced=32768, anonymous=12288, swap=0), pmmap_grouped(path='/lib/x8664-linux-gnu/libc-2.15....
file = open("./ip.txt", "r") line = file.readlines() for i in range(len(line)): print("对IP: %s 执行"%line[i].strip('\n')) 代码语言:javascript 复制 ssh.connect(hostname=line[i].strip('\n'),port=port,username=user,password=passwd)stdin,stdout,stderr=ssh.exec_command(cmd)...