top command on multi core processor
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33
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I am using freescale IMX6 quad processor. I want to know if the top command lists the CPU usage of all 4 cores or of a single core. I am seeing an application's CPU usage being the same with 4 cores and with a single core. I was guessing the CPU usage by the application will increase on a single core and decrease on 4 cores but it has not changed.
linux top parallelism cpu-usage
edited Sep 12 '17 at 2:02
Jeff Schaller
38.1k1053124
asked Jul 23 '14 at 10:45
user3818847
331247
|
show 2 more comments
up vote
33
down vote
favorite
I am using freescale IMX6 quad processor. I want to know if the top command lists the CPU usage of all 4 cores or of a single core. I am seeing an application's CPU usage being the same with 4 cores and with a single core. I was guessing the CPU usage by the application will increase on a single core and decrease on 4 cores but it has not changed.
linux top parallelism cpu-usage
edited Sep 12 '17 at 2:02
Jeff Schaller
38.1k1053124
asked Jul 23 '14 at 10:45
user3818847
331247
3
try pressing 1 while top is running
– Dani_l
Jul 23 '14 at 10:57
Could you please elaborate. As in what happens if I press 1. Because I am getting this inconsistent result since 2 days.
– user3818847
Jul 23 '14 at 10:59
you may find this link useful: unix.stackexchange.com/questions/41311/cpu-and-core-usage-stats
– Tejas
Jul 23 '14 at 11:05
1
Which application is that? Why do you think your application should use multiple cores if available? There are many applications out there that work on a single CPU/core and for which nobody bothered to take the time to parallize them.
– Anthon
Jul 23 '14 at 11:05
1
no. if multiple cores, they accumulate to over 100%. 4 cores can get as high as 800% with hyperthreading on each core
– Dani_l
Jul 23 '14 at 11:35
|
show 2 more comments
up vote
33
down vote
favorite
up vote
33
down vote
favorite
I am using freescale IMX6 quad processor. I want to know if the top command lists the CPU usage of all 4 cores or of a single core. I am seeing an application's CPU usage being the same with 4 cores and with a single core. I was guessing the CPU usage by the application will increase on a single core and decrease on 4 cores but it has not changed.
linux top parallelism cpu-usage
edited Sep 12 '17 at 2:02
Jeff Schaller
38.1k1053124
asked Jul 23 '14 at 10:45
user3818847
331247
I am using freescale IMX6 quad processor. I want to know if the top command lists the CPU usage of all 4 cores or of a single core. I am seeing an application's CPU usage being the same with 4 cores and with a single core. I was guessing the CPU usage by the application will increase on a single core and decrease on 4 cores but it has not changed.
linux top parallelism cpu-usage
linux top parallelism cpu-usage
edited Sep 12 '17 at 2:02
Jeff Schaller
38.1k1053124
asked Jul 23 '14 at 10:45
user3818847
331247
edited Sep 12 '17 at 2:02
Jeff Schaller
38.1k1053124
asked Jul 23 '14 at 10:45
user3818847
331247
edited Sep 12 '17 at 2:02
Jeff Schaller
38.1k1053124
edited Sep 12 '17 at 2:02
Jeff Schaller
38.1k1053124
edited Sep 12 '17 at 2:02
Jeff Schaller
38.1k1053124
38.1k1053124
asked Jul 23 '14 at 10:45
user3818847
331247
asked Jul 23 '14 at 10:45
user3818847
331247
asked Jul 23 '14 at 10:45
user3818847
331247
331247
3
try pressing 1 while top is running
– Dani_l
Jul 23 '14 at 10:57
Could you please elaborate. As in what happens if I press 1. Because I am getting this inconsistent result since 2 days.
– user3818847
Jul 23 '14 at 10:59
you may find this link useful: unix.stackexchange.com/questions/41311/cpu-and-core-usage-stats
– Tejas
Jul 23 '14 at 11:05
1
Which application is that? Why do you think your application should use multiple cores if available? There are many applications out there that work on a single CPU/core and for which nobody bothered to take the time to parallize them.
– Anthon
Jul 23 '14 at 11:05
1
no. if multiple cores, they accumulate to over 100%. 4 cores can get as high as 800% with hyperthreading on each core
– Dani_l
Jul 23 '14 at 11:35
|
show 2 more comments
3
try pressing 1 while top is running
– Dani_l
Jul 23 '14 at 10:57
Could you please elaborate. As in what happens if I press 1. Because I am getting this inconsistent result since 2 days.
– user3818847
Jul 23 '14 at 10:59
you may find this link useful: unix.stackexchange.com/questions/41311/cpu-and-core-usage-stats
– Tejas
Jul 23 '14 at 11:05
1
Which application is that? Why do you think your application should use multiple cores if available? There are many applications out there that work on a single CPU/core and for which nobody bothered to take the time to parallize them.
– Anthon
Jul 23 '14 at 11:05
1
no. if multiple cores, they accumulate to over 100%. 4 cores can get as high as 800% with hyperthreading on each core
– Dani_l
Jul 23 '14 at 11:35
3
3
try pressing 1 while top is running
– Dani_l
Jul 23 '14 at 10:57
try pressing 1 while top is running
– Dani_l
Jul 23 '14 at 10:57
Could you please elaborate. As in what happens if I press 1. Because I am getting this inconsistent result since 2 days.
– user3818847
Jul 23 '14 at 10:59
Could you please elaborate. As in what happens if I press 1. Because I am getting this inconsistent result since 2 days.
– user3818847
Jul 23 '14 at 10:59
you may find this link useful: unix.stackexchange.com/questions/41311/cpu-and-core-usage-stats
– Tejas
Jul 23 '14 at 11:05
you may find this link useful: unix.stackexchange.com/questions/41311/cpu-and-core-usage-stats
– Tejas
Jul 23 '14 at 11:05
1
1
Which application is that? Why do you think your application should use multiple cores if available? There are many applications out there that work on a single CPU/core and for which nobody bothered to take the time to parallize them.
– Anthon
Jul 23 '14 at 11:05
Which application is that? Why do you think your application should use multiple cores if available? There are many applications out there that work on a single CPU/core and for which nobody bothered to take the time to parallize them.
– Anthon
Jul 23 '14 at 11:05
1
1
no. if multiple cores, they accumulate to over 100%. 4 cores can get as high as 800% with hyperthreading on each core
– Dani_l
Jul 23 '14 at 11:35
no. if multiple cores, they accumulate to over 100%. 4 cores can get as high as 800% with hyperthreading on each core
– Dani_l
Jul 23 '14 at 11:35
|
show 2 more comments
2 Answers
2
active
oldest
votes
up vote
50
down vote
I'm not entirely sure what you're asking here. Yes, top shows CPU usage as a percentage of a single CPU by default. That's why you can have percentages that are >100. On a system with 4 cores, you can see up to 400% CPU usage.
You can change this behavior by pressing I (that's Shift + i and toggles "Irix mode") while top is running. That will cause it to show the pecentage of available CPU power being used. As explained in man top:
1. %CPU -- CPU Usage
The task's share of the elapsed CPU time since the last screen
update, expressed as a percentage of total CPU time. In a
true SMP environment, if 'Irix mode' is Off, top will operate
in 'Solaris mode' where a task's cpu usage will be divided by
the total number of CPUs. You toggle 'Irix/Solaris' modes
with the 'I' interactive command.
Alternatively, you can press 1 which will show you a breakdown of CPU usage per CPU:
top - 13:12:58 up 21:11, 17 users, load average: 0.69, 0.50, 0.43
Tasks: 248 total, 3 running, 244 sleeping, 0 stopped, 1 zombie
%Cpu0 : 33.3 us, 33.3 sy, 0.0 ni, 33.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 : 16.7 us, 0.0 sy, 0.0 ni, 83.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu2 : 60.0 us, 0.0 sy, 0.0 ni, 40.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 8186416 total, 6267232 used, 1919184 free, 298832 buffers
KiB Swap: 8191996 total, 0 used, 8191996 free, 2833308 cached
answered Jul 23 '14 at 11:13
terdon♦
127k31246423
1
with hyperthread I believe you can see up to 800% as /proc/cpuinfo will show each thread as a cpu
– Dani_l
Jul 23 '14 at 11:37
@Dani_l yes, whether the "core" is physical or virtual is irrelevant, it is treated as a "CPU" bytop. The output I show is from my laptop which has a single physical CPU with two cores, each of which has a 2nd logical core. The result is thattopsees 4 cores.
– terdon♦
Jul 23 '14 at 11:44
Sorry for the nitpicking, in my dayjob we have to distinguish between sockets, cores and threads when reserving resources. I guess the habit stuck.
– Dani_l
Jul 23 '14 at 11:48
add a comment |
up vote
2
down vote
just click on '1' while top is running
answered Mar 28 at 7:15
Abdullah
291
1
This answer is in the comments for years now... please add something new.
– yeti
Mar 28 at 12:05
add a comment |
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2 Answers
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2 Answers
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I'm not entirely sure what you're asking here. Yes, top shows CPU usage as a percentage of a single CPU by default. That's why you can have percentages that are >100. On a system with 4 cores, you can see up to 400% CPU usage.
You can change this behavior by pressing I (that's Shift + i and toggles "Irix mode") while top is running. That will cause it to show the pecentage of available CPU power being used. As explained in man top:
1. %CPU -- CPU Usage
The task's share of the elapsed CPU time since the last screen
update, expressed as a percentage of total CPU time. In a
true SMP environment, if 'Irix mode' is Off, top will operate
in 'Solaris mode' where a task's cpu usage will be divided by
the total number of CPUs. You toggle 'Irix/Solaris' modes
with the 'I' interactive command.
Alternatively, you can press 1 which will show you a breakdown of CPU usage per CPU:
top - 13:12:58 up 21:11, 17 users, load average: 0.69, 0.50, 0.43
Tasks: 248 total, 3 running, 244 sleeping, 0 stopped, 1 zombie
%Cpu0 : 33.3 us, 33.3 sy, 0.0 ni, 33.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 : 16.7 us, 0.0 sy, 0.0 ni, 83.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu2 : 60.0 us, 0.0 sy, 0.0 ni, 40.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 8186416 total, 6267232 used, 1919184 free, 298832 buffers
KiB Swap: 8191996 total, 0 used, 8191996 free, 2833308 cached
answered Jul 23 '14 at 11:13
terdon♦
127k31246423
1
with hyperthread I believe you can see up to 800% as /proc/cpuinfo will show each thread as a cpu
– Dani_l
Jul 23 '14 at 11:37
@Dani_l yes, whether the "core" is physical or virtual is irrelevant, it is treated as a "CPU" bytop. The output I show is from my laptop which has a single physical CPU with two cores, each of which has a 2nd logical core. The result is thattopsees 4 cores.
– terdon♦
Jul 23 '14 at 11:44
Sorry for the nitpicking, in my dayjob we have to distinguish between sockets, cores and threads when reserving resources. I guess the habit stuck.
– Dani_l
Jul 23 '14 at 11:48
add a comment |
up vote
50
down vote
I'm not entirely sure what you're asking here. Yes, top shows CPU usage as a percentage of a single CPU by default. That's why you can have percentages that are >100. On a system with 4 cores, you can see up to 400% CPU usage.
You can change this behavior by pressing I (that's Shift + i and toggles "Irix mode") while top is running. That will cause it to show the pecentage of available CPU power being used. As explained in man top:
1. %CPU -- CPU Usage
The task's share of the elapsed CPU time since the last screen
update, expressed as a percentage of total CPU time. In a
true SMP environment, if 'Irix mode' is Off, top will operate
in 'Solaris mode' where a task's cpu usage will be divided by
the total number of CPUs. You toggle 'Irix/Solaris' modes
with the 'I' interactive command.
Alternatively, you can press 1 which will show you a breakdown of CPU usage per CPU:
top - 13:12:58 up 21:11, 17 users, load average: 0.69, 0.50, 0.43
Tasks: 248 total, 3 running, 244 sleeping, 0 stopped, 1 zombie
%Cpu0 : 33.3 us, 33.3 sy, 0.0 ni, 33.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 : 16.7 us, 0.0 sy, 0.0 ni, 83.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu2 : 60.0 us, 0.0 sy, 0.0 ni, 40.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 8186416 total, 6267232 used, 1919184 free, 298832 buffers
KiB Swap: 8191996 total, 0 used, 8191996 free, 2833308 cached
answered Jul 23 '14 at 11:13
terdon♦
127k31246423
1
with hyperthread I believe you can see up to 800% as /proc/cpuinfo will show each thread as a cpu
– Dani_l
Jul 23 '14 at 11:37
@Dani_l yes, whether the "core" is physical or virtual is irrelevant, it is treated as a "CPU" bytop. The output I show is from my laptop which has a single physical CPU with two cores, each of which has a 2nd logical core. The result is thattopsees 4 cores.
– terdon♦
Jul 23 '14 at 11:44
Sorry for the nitpicking, in my dayjob we have to distinguish between sockets, cores and threads when reserving resources. I guess the habit stuck.
– Dani_l
Jul 23 '14 at 11:48
add a comment |
up vote
50
down vote
up vote
50
down vote
I'm not entirely sure what you're asking here. Yes, top shows CPU usage as a percentage of a single CPU by default. That's why you can have percentages that are >100. On a system with 4 cores, you can see up to 400% CPU usage.
You can change this behavior by pressing I (that's Shift + i and toggles "Irix mode") while top is running. That will cause it to show the pecentage of available CPU power being used. As explained in man top:
1. %CPU -- CPU Usage
The task's share of the elapsed CPU time since the last screen
update, expressed as a percentage of total CPU time. In a
true SMP environment, if 'Irix mode' is Off, top will operate
in 'Solaris mode' where a task's cpu usage will be divided by
the total number of CPUs. You toggle 'Irix/Solaris' modes
with the 'I' interactive command.
Alternatively, you can press 1 which will show you a breakdown of CPU usage per CPU:
top - 13:12:58 up 21:11, 17 users, load average: 0.69, 0.50, 0.43
Tasks: 248 total, 3 running, 244 sleeping, 0 stopped, 1 zombie
%Cpu0 : 33.3 us, 33.3 sy, 0.0 ni, 33.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 : 16.7 us, 0.0 sy, 0.0 ni, 83.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu2 : 60.0 us, 0.0 sy, 0.0 ni, 40.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 8186416 total, 6267232 used, 1919184 free, 298832 buffers
KiB Swap: 8191996 total, 0 used, 8191996 free, 2833308 cached
answered Jul 23 '14 at 11:13
terdon♦
127k31246423
I'm not entirely sure what you're asking here. Yes, top shows CPU usage as a percentage of a single CPU by default. That's why you can have percentages that are >100. On a system with 4 cores, you can see up to 400% CPU usage.
You can change this behavior by pressing I (that's Shift + i and toggles "Irix mode") while top is running. That will cause it to show the pecentage of available CPU power being used. As explained in man top:
1. %CPU -- CPU Usage
The task's share of the elapsed CPU time since the last screen
update, expressed as a percentage of total CPU time. In a
true SMP environment, if 'Irix mode' is Off, top will operate
in 'Solaris mode' where a task's cpu usage will be divided by
the total number of CPUs. You toggle 'Irix/Solaris' modes
with the 'I' interactive command.
Alternatively, you can press 1 which will show you a breakdown of CPU usage per CPU:
top - 13:12:58 up 21:11, 17 users, load average: 0.69, 0.50, 0.43
Tasks: 248 total, 3 running, 244 sleeping, 0 stopped, 1 zombie
%Cpu0 : 33.3 us, 33.3 sy, 0.0 ni, 33.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 : 16.7 us, 0.0 sy, 0.0 ni, 83.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu2 : 60.0 us, 0.0 sy, 0.0 ni, 40.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 8186416 total, 6267232 used, 1919184 free, 298832 buffers
KiB Swap: 8191996 total, 0 used, 8191996 free, 2833308 cached
answered Jul 23 '14 at 11:13
terdon♦
127k31246423
answered Jul 23 '14 at 11:13
terdon♦
127k31246423
answered Jul 23 '14 at 11:13
terdon♦
127k31246423
answered Jul 23 '14 at 11:13
terdon♦
127k31246423
127k31246423
1
with hyperthread I believe you can see up to 800% as /proc/cpuinfo will show each thread as a cpu
– Dani_l
Jul 23 '14 at 11:37
@Dani_l yes, whether the "core" is physical or virtual is irrelevant, it is treated as a "CPU" bytop. The output I show is from my laptop which has a single physical CPU with two cores, each of which has a 2nd logical core. The result is thattopsees 4 cores.
– terdon♦
Jul 23 '14 at 11:44
Sorry for the nitpicking, in my dayjob we have to distinguish between sockets, cores and threads when reserving resources. I guess the habit stuck.
– Dani_l
Jul 23 '14 at 11:48
add a comment |
1
with hyperthread I believe you can see up to 800% as /proc/cpuinfo will show each thread as a cpu
– Dani_l
Jul 23 '14 at 11:37
@Dani_l yes, whether the "core" is physical or virtual is irrelevant, it is treated as a "CPU" bytop. The output I show is from my laptop which has a single physical CPU with two cores, each of which has a 2nd logical core. The result is thattopsees 4 cores.
– terdon♦
Jul 23 '14 at 11:44
Sorry for the nitpicking, in my dayjob we have to distinguish between sockets, cores and threads when reserving resources. I guess the habit stuck.
– Dani_l
Jul 23 '14 at 11:48
1
1
with hyperthread I believe you can see up to 800% as /proc/cpuinfo will show each thread as a cpu
– Dani_l
Jul 23 '14 at 11:37
with hyperthread I believe you can see up to 800% as /proc/cpuinfo will show each thread as a cpu
– Dani_l
Jul 23 '14 at 11:37
@Dani_l yes, whether the "core" is physical or virtual is irrelevant, it is treated as a "CPU" by
top. The output I show is from my laptop which has a single physical CPU with two cores, each of which has a 2nd logical core. The result is that top sees 4 cores.– terdon♦
Jul 23 '14 at 11:44
@Dani_l yes, whether the "core" is physical or virtual is irrelevant, it is treated as a "CPU" by
top. The output I show is from my laptop which has a single physical CPU with two cores, each of which has a 2nd logical core. The result is that top sees 4 cores.– terdon♦
Jul 23 '14 at 11:44
Sorry for the nitpicking, in my dayjob we have to distinguish between sockets, cores and threads when reserving resources. I guess the habit stuck.
– Dani_l
Jul 23 '14 at 11:48
Sorry for the nitpicking, in my dayjob we have to distinguish between sockets, cores and threads when reserving resources. I guess the habit stuck.
– Dani_l
Jul 23 '14 at 11:48
add a comment |
up vote
2
down vote
just click on '1' while top is running
answered Mar 28 at 7:15
Abdullah
291
1
This answer is in the comments for years now... please add something new.
– yeti
Mar 28 at 12:05
add a comment |
up vote
2
down vote
just click on '1' while top is running
answered Mar 28 at 7:15
Abdullah
291
1
This answer is in the comments for years now... please add something new.
– yeti
Mar 28 at 12:05
add a comment |
up vote
2
down vote
up vote
2
down vote
just click on '1' while top is running
answered Mar 28 at 7:15
Abdullah
291
just click on '1' while top is running
answered Mar 28 at 7:15
Abdullah
291
answered Mar 28 at 7:15
Abdullah
291
answered Mar 28 at 7:15
Abdullah
291
answered Mar 28 at 7:15
Abdullah
291
291
1
This answer is in the comments for years now... please add something new.
– yeti
Mar 28 at 12:05
add a comment |
1
This answer is in the comments for years now... please add something new.
– yeti
Mar 28 at 12:05
1
1
This answer is in the comments for years now... please add something new.
– yeti
Mar 28 at 12:05
This answer is in the comments for years now... please add something new.
– yeti
Mar 28 at 12:05
add a comment |
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3
try pressing 1 while top is running
– Dani_l
Jul 23 '14 at 10:57
Could you please elaborate. As in what happens if I press 1. Because I am getting this inconsistent result since 2 days.
– user3818847
Jul 23 '14 at 10:59
you may find this link useful: unix.stackexchange.com/questions/41311/cpu-and-core-usage-stats
– Tejas
Jul 23 '14 at 11:05
1
Which application is that? Why do you think your application should use multiple cores if available? There are many applications out there that work on a single CPU/core and for which nobody bothered to take the time to parallize them.
– Anthon
Jul 23 '14 at 11:05
1
no. if multiple cores, they accumulate to over 100%. 4 cores can get as high as 800% with hyperthreading on each core
– Dani_l
Jul 23 '14 at 11:35