gvim 程序在打开任何文件之前卡住了 3 秒。这个问题与gvim无关,vim打开得很好。因此,原因一定是 X 或某些相关服务中的某个地方,而不是 vim。
我尝试禁用所有 vim 插件和 vimrc 文件。
这是症状:
$ time strace -o strace.gvim -f -yy -T gvim -c q
time: Real 0m3.5s User 0m0.0s System 0m0.1s
虽然 vim 运行良好:
$ time strace -o strace.vim -f -yy -T vim -c q
time: Real 0m0.2s User 0m0.0s System 0m0.0s
为了弄清楚这一点,我正在寻找花费了这么长时间的原因:
...看起来它与 dbus 服务有某种关系。
$ grep '<3\.[0-9]' -C 2 strace.gvim
-
4907 exit_group(0) = ?
4907 +++ exited with 0 +++
4848 <... nanosleep resumed> 0x7ffcaa8f8670) = 0 <3.000198>
4848 kill(4907, SIGKILL) = -1 ESRCH (No such process) <0.000061>
4848 write(1<pipe:[29773]>, "unix:abstract=/tmp/dbus-8t4OQuvB"..., 73) = 73 <0.000071>
@@@@@@@@ 4586 <... read resumed> "unix:abstract=/tmp/dbus-8t4OQuvB"..., 1024) = 73 <3.038342>
4848 write(1<pipe:[29773]>, "+\23\0\0", 4 <unfinished ...>
4586 read(7<pipe:[29773]>, <unfinished ...>
--
4586 <... read resumed> "", 1024) = 0 <0.000038>
4586 wait4(4848, <unfinished ...>
@@@@@@@@ 4900 <... read resumed> "", 4) = 0 <3.017352>
4848 +++ exited with 0 +++
4900 write(2</dev/null<char 1:3>>, "EOF in dbus-launch reading PID f"..., 47) = 47 <0.000003>
--
4586 close(4<pipe:[30791]>) = 0 <0.000003>
4586 poll([{fd=5<UNIX:[29772]>, events=POLLIN}, {fd=6<anon_inode:[eventfd]>, events=POLLIN}], 2, 0 <unfinished ...>
@@@@@@@@ 4579 <... read resumed> "ok\0", 9) = 3 <3.368490>
4586 <... poll resumed> ) = 0 (Timeout) <0.000006>
4586 poll([{fd=5<UNIX:[29772]>, events=POLLIN}, {fd=6<anon_inode:[eventfd]>, events=POLLIN}], 2, 0 <unfinished ...>
进一步查看,我发现该~/.dbus
文件夹归 root 所有:
4848 mkdir("/home/jaroslav/.dbus", 0700) = -1 EEXIST (File exists) <0.000005>
4848 mkdir("/home/jaroslav/.dbus/session-bus", 0700) = -1 EACCES (Permission denied) <0.000003>
4848 write(2<pipe:[29774]>, "Unable to create /home/jaroslav/"..., 50) = 50 <0.000004>
-
$ ls -ld ~/.dbus
drwx------ 1 root root 1 191206 18:50 /home/jaroslav/.dbus
更改所有者解决了问题,gvim 立即启动。
strace 很好,但是
是否有可能以某种方式跟踪所有耗时超过 3 秒的内核调用并打印其堆栈(Linux 4.19.72)?