If R (runqueue) is greater in B (waitqueue) in vmstat, is is I/O bound?
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If the runqueue is the number of processes waiting for their turn on the CPU + processes currently running, and waitqueue is the number of processes waiting for I/O, then wouldn’t B in the vmstat output being greater than R mean that there is an I/O bound, not CPU bound? I am confused because the link below says the opposite ...
From http://nonfunctionaltestingtools.blogspot.com/2013/03/vmstat-output-explained.html?m=1
“If runnable threads (r) divided by the number of CPU is greater than one -> possible CPU bottleneck (The (r) coulmn should be compared with number of CPUs (logical CPUs as in uptime) if we have enough CPUs or we have more threads.) High numbers in the blocked processes column (b) indicates slow disks. (r) should always be higher than (b); if it is not, it usually means you have a CPU bottleneckâ€Â
cpu-usage
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John Alvarez
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If the runqueue is the number of processes waiting for their turn on the CPU + processes currently running, and waitqueue is the number of processes waiting for I/O, then wouldn’t B in the vmstat output being greater than R mean that there is an I/O bound, not CPU bound? I am confused because the link below says the opposite ...
From http://nonfunctionaltestingtools.blogspot.com/2013/03/vmstat-output-explained.html?m=1
“If runnable threads (r) divided by the number of CPU is greater than one -> possible CPU bottleneck (The (r) coulmn should be compared with number of CPUs (logical CPUs as in uptime) if we have enough CPUs or we have more threads.) High numbers in the blocked processes column (b) indicates slow disks. (r) should always be higher than (b); if it is not, it usually means you have a CPU bottleneckâ€Â
cpu-usage
asked 3 mins ago
John Alvarez
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John Alvarez is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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up vote
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down vote
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up vote
0
down vote
favorite
If the runqueue is the number of processes waiting for their turn on the CPU + processes currently running, and waitqueue is the number of processes waiting for I/O, then wouldn’t B in the vmstat output being greater than R mean that there is an I/O bound, not CPU bound? I am confused because the link below says the opposite ...
From http://nonfunctionaltestingtools.blogspot.com/2013/03/vmstat-output-explained.html?m=1
“If runnable threads (r) divided by the number of CPU is greater than one -> possible CPU bottleneck (The (r) coulmn should be compared with number of CPUs (logical CPUs as in uptime) if we have enough CPUs or we have more threads.) High numbers in the blocked processes column (b) indicates slow disks. (r) should always be higher than (b); if it is not, it usually means you have a CPU bottleneckâ€Â
cpu-usage
asked 3 mins ago
John Alvarez
1
New contributor
John Alvarez is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
If the runqueue is the number of processes waiting for their turn on the CPU + processes currently running, and waitqueue is the number of processes waiting for I/O, then wouldn’t B in the vmstat output being greater than R mean that there is an I/O bound, not CPU bound? I am confused because the link below says the opposite ...
From http://nonfunctionaltestingtools.blogspot.com/2013/03/vmstat-output-explained.html?m=1
“If runnable threads (r) divided by the number of CPU is greater than one -> possible CPU bottleneck (The (r) coulmn should be compared with number of CPUs (logical CPUs as in uptime) if we have enough CPUs or we have more threads.) High numbers in the blocked processes column (b) indicates slow disks. (r) should always be higher than (b); if it is not, it usually means you have a CPU bottleneckâ€Â
cpu-usage
cpu-usage
asked 3 mins ago
John Alvarez
1
New contributor
John Alvarez is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
John Alvarez
1
New contributor
John Alvarez is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
John Alvarez
1
New contributor
John Alvarez is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
John Alvarez
1
asked 3 mins ago
John Alvarez
1
1
New contributor
John Alvarez is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
John Alvarez is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
John Alvarez is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
add a comment |Â
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John Alvarez is a new contributor. Be nice, and check out our Code of Conduct.
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