On 04/08/2018 08:21 PM, Ken Moffat wrote:
On Sun, Apr 08, 2018 at 08:01:43PM -0500, Bruce Dubbs wrote:
On 04/08/2018 06:39 PM, Ken Moffat wrote:


While watching rust build/test, I've been running top.  My past
experience suggests that a process will normally max out at 100%
(i.e. all of _one_ core), but with rust I'm seeing percentages of
250-300%.  Is that normal ?

Do you know that for top pressing 1 (one) will show individual cores?
Pressing t will make them into a pseudo graphical (curses) display. I've
seen a load of over 13 for some long builds using ninja.

I normally have top set to show loadavg, whatever is on the next
line, a %Cpu line for each core, with a line of '|' after the
percentage, memory, swap, and then the old-style details (running
processes rather than trees of threads).

But I think you are talking about loadavg on your 12 core machine ?
I was seeing loadavgs of 4 or 5 from time to time while rust was
running.

The diference here is that I'm used to individual processes each
going up to 100%, but here the main process is/was running at 400%
(only 4 cores on this machine).

I'm not sure what you mean by 'the main process'.  What I mean is:

top - 20:33:33 up 26 days, 1:53, 4 users, load average: 0.02, 0.01, 0.00
Tasks: 224 total,   1 running, 131 sleeping,   0 stopped,   0 zombie
%Cpu0  :   0.7/0.0     1[                              ]
%Cpu1  :   0.0/0.0     0[                              ]
%Cpu2  :   0.0/0.0     0[                              ]
%Cpu3  :   0.0/0.0     0[                              ]
%Cpu4  :   0.0/0.0     0[                              ]
%Cpu5  :   0.0/0.0     0[                              ]
%Cpu6  :   0.0/0.0     0[                              ]
%Cpu7  :   0.0/0.0     0[                              ]
%Cpu8  :   0.0/0.0     0[                              ]
%Cpu9  :   0.0/0.0     0[                              ]
%Cpu10 :   0.0/0.0     0[                              ]
%Cpu11 :   0.0/0.0     0[                              ]
MiB Mem :  2.7/15943.78+[                              ]
MiB Swap:  0.0/20479.99+[                              ]

Of course that is idle right now, but I have seen 14 on the top line where is says load average: (Last minute, Last 5 minutes, last 15 minutes). And yes, I've seen over 12 for that last number.

  -- Bruce
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