lsof仅列出进程ID.要获取有关线程的信息,您应该使用ps -eLf.根据

man proc：

/proc/[pid]/task (since Linux 2.6.0-test6)

This is a directory that contains one subdirectory for each

thread in the process. The name of each subdirectory is the

numerical thread ID ([tid]) of the thread (see 07001).

Within each of these subdirectories,there is a set of files

with the same names and contents as under the /proc/[pid]

directories. For attributes that are shared by all threads,the contents for each of the files under the task/[tid]

subdirectories will be the same as in the corresponding file

in the parent /proc/[pid] directory (e.g.,in a multithreaded

process,all of the task/[tid]/cwd files will have the same

value as the /proc/[pid]/cwd file in the parent directory,since all of the threads in a process share a working

directory). For attributes that are distinct for each thread,the corresponding files under task/[tid] may have different

values (e.g.,varIoUs fields in each of the task/[tid]/status

files may be different for each thread).@H_301_37@

In a multithreaded process,the contents of the

/proc/[pid]/task directory are not available if the main

thread has already terminated (typically by calling

07002).

我会通过运行来计算打开文件描述符的数量：

ps -eL | awk 'NR > 1 { print $1,$2 }' | \

while read x; do \

find /proc/${x% *}/task/${x#* }/fd/ -type l; \

done | wc -l

结果是17270.

让我们看看自启动以来分配了多少文件描述符：

cat /proc/sys/fs/file-nr

11616 0 398855

为什么/ proc / [pid] / task / [tid] / fd中的文件描述符数量超过/ proc / sys / fs / file-nr中分配的文件句柄数？我想它们是由分叉的子进程创建的：

The child inherits copies of the parent’s set of open file@H_301_37@ descriptors.

POSIX.1 also requires that threads share a range of other@H_301_37@ attributes (i.e.,these attributes are process-wide rather than@H_301_37@ per-thread):@H_301_37@ – process ID

parent process ID

process group ID and session ID

controlling terminal

user and group IDs

open file descriptors