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leoliu / ggtags

Emacs frontend to GNU Global source code tagging system.
http://elpa.gnu.org
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CPU is pinned to 100%, with excessive gtags processes spawned #205

Open someonewithpc opened 4 years ago

someonewithpc commented 4 years ago

I'm not sure if this is the result of any recent change, I hadn't updated my packages in a while, but I'm now noticing that about 12 gtags processes get spawned and pin the CPU to 100%. According to top, each process uses 80% +/- 20% CPU. If I killall gtags, they come back after a small while. This all happens despite the fact that the entire project is (or appears to be) completely mapped already.

The computer is still responsive, but it causes overheating which isn't great in the summer :p

leoliu commented 4 years ago

Is this problem reoccurring? When it happens you may find M-x list-processes useful.

someonewithpc commented 4 years ago

Yes, it happens apparently when I save or switch buffers. list-processes shows

helm-gtags-u... 17519   run     --              /dev/pts/2   global --single-update /home/hugo/software/social/src/Util/Notification/TransportInterface.php
helm-gtags-u... 17901   run     --              /dev/pts/3   global --single-update /home/hugo/software/social/src/Util/Notification/TransportInterface.php
helm-gtags-u... 18475   run     --              /dev/pts/4   global --single-update /home/hugo/software/social/src/Util/Notification/TransportInterface.php

top shows:

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                                                                                                
  19532 hugo      20   0    6452   5040   1864 R  99.7   0.0   7:48.90 gtags                                                                                                                  
  20613 hugo      20   0    6452   4976   1800 R  99.7   0.0   2:40.93 gtags                                                                                                                  
  20769 hugo      20   0    6452   5080   1904 R  99.7   0.0   1:53.77 gtags                                                                                                                  
  19531 hugo      20   0    6452   5032   1856 R  99.3   0.0   7:49.14 gtags                                                                                                                  
  20612 hugo      20   0    6452   5048   1872 R  99.3   0.0   2:40.97 gtags                                                                                                                  
  20844 hugo      20   0    6452   5088   1920 R  99.3   0.0   1:35.62 gtags                                                                                                                  
  20845 hugo      20   0    6452   5052   1888 R  99.3   0.0   1:35.18 gtags

The pids don't match because they were taken at different points

So maybe the problem is with helm-gtags instead? Could also be a global bug, since the processes seem to not terminate.

$ global --version
global (GNU GLOBAL) 6.6.4
leoliu commented 4 years ago

Indeed it may not be ggtags' fault which waits for gtags to finish before another instance.

someonewithpc commented 4 years ago

So, do you think it's helm-gtags's fault, or global's?

someonewithpc commented 4 years ago

I have disabled helm-gtags and I still get the same problem.

list-processes

global          87804   run      *ggtags-def... /dev/pts/1   global --nearness=. --result=grep --path-style=absolute $req

top

     PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                                                                                                
  87714 hugo      20   0    6584   5040   1872 R  47.5   0.0   3:03.74 gtags                                                                                                                  
  84619 hugo      20   0    6452   5036   1872 R  46.8   0.0  16:14.35 gtags                                                                                                                  
  88210 hugo      20   0    6584   5012   1852 R  46.8   0.0   1:46.60 gtags                                                                                                                  
  85465 hugo      20   0    6584   5060   1884 R  46.5   0.0  12:36.41 gtags                                                                                                                  
  85755 hugo      20   0    6584   5056   1884 R  46.2   0.0  11:05.94 gtags                                                                                                                  
  86472 hugo      20   0    6584   4984   1796 R  46.2   0.0   8:11.66 gtags                                                                                                                  
  87381 hugo      20   0    6584   4996   1824 R  46.2   0.0   4:19.81 gtags                                                                                                                  
  88234 hugo      20   0    6584   5000   1832 R  46.2   0.0   1:43.91 gtags                                                                                                                  
  85809 hugo      20   0    6584   5064   1888 R  45.5   0.0  10:48.74 gtags                                                                                                                  
  86276 hugo      20   0    6584   5080   1904 R  45.5   0.0   8:54.09 gtags                                                                                                                  
  87615 hugo      20   0    6584   5080   1896 R  45.5   0.0   3:17.74 gtags                                                                                                                  
  87804 hugo      20   0    6664   5016   1836 R  45.5   0.0   2:54.65 global                                                                                                                 
  87809 hugo      20   0    6584   5060   1884 R  45.5   0.0   2:53.98 gtags                                                                                                                  
  85616 hugo      20   0    6584   4940   1764 R  45.2   0.0  11:39.59 gtags                                                                                                                  
  86203 hugo      20   0    6584   5072   1892 R  45.2   0.0   9:03.52 gtags                                                                                                                  
  86095 hugo      20   0    6584   4996   1824 R  44.9   0.0   9:40.63 gtags                                                                                                                  
  85998 hugo      20   0    6584   5064   1896 R  42.9   0.0  10:04.90 gtags
leoliu commented 4 years ago

Basically it looks like something is starting gtags without checking existing instances.

You can get the full command of gtags and run it in the terminal to see if it completes its execution. This should tell you if gtags itself is buggy. For example ps ax | grep gtags may reveal the full command used.

If gtags is working correctly then there may be some elisp program that is at fault. Try to get a minimal example to reproduce the bug. A good start is to start Emacs without loading your customisations.