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docker stats memory lower than top's rss
The Next CEO of Stack Overflow“Used” memory in top larger than the VmSize of all pocesses listed in /proc/?memory difference on top and htopJVM process resident set size “equals” max heap size, not current heap sizeDocker + Apache, how does memory usage work?free shows more memory used than top process totalHow does docker stats output relate to top output?Memory usage in docker container - 600MB for OS only?docker-machine memory allocationAnalyze memory and cpu peaks of docker containerprogram on cluster exceeds RSS memory limit
I created a container, in which I've created ~10 processes. I want to analyze how much memory they're consuming. To achieve that, I ran top inside the container, and docker stats outside.
In top, I see 10 processes, each taking 50MB of resident memory. So I would expect docker stats to show at least 500MB memory used by the container, but it shows only 140 MB.
Where does this discrepancy come from? What is the real memory consumption?
htop output:
docker stats output:
docker memory-usage top htop
asked yesterday
spellerspeller
1061
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speller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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I created a container, in which I've created ~10 processes. I want to analyze how much memory they're consuming. To achieve that, I ran top inside the container, and docker stats outside.
In top, I see 10 processes, each taking 50MB of resident memory. So I would expect docker stats to show at least 500MB memory used by the container, but it shows only 140 MB.
Where does this discrepancy come from? What is the real memory consumption?
htop output:
docker stats output:
docker memory-usage top htop
asked yesterday
spellerspeller
1061
New contributor
speller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Isn't the size in theREScolumn in Bytes?
– Thomas
yesterday
add a comment |
I created a container, in which I've created ~10 processes. I want to analyze how much memory they're consuming. To achieve that, I ran top inside the container, and docker stats outside.
In top, I see 10 processes, each taking 50MB of resident memory. So I would expect docker stats to show at least 500MB memory used by the container, but it shows only 140 MB.
Where does this discrepancy come from? What is the real memory consumption?
htop output:
docker stats output:
docker memory-usage top htop
asked yesterday
spellerspeller
1061
New contributor
speller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I created a container, in which I've created ~10 processes. I want to analyze how much memory they're consuming. To achieve that, I ran top inside the container, and docker stats outside.
In top, I see 10 processes, each taking 50MB of resident memory. So I would expect docker stats to show at least 500MB memory used by the container, but it shows only 140 MB.
Where does this discrepancy come from? What is the real memory consumption?
htop output:
docker stats output:
docker memory-usage top htop
docker memory-usage top htop
asked yesterday
spellerspeller
1061
New contributor
speller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
spellerspeller
1061
New contributor
speller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
spellerspeller
1061
New contributor
speller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
spellerspeller
1061
asked yesterday
spellerspeller
1061
1061
New contributor
speller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
speller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
speller is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Isn't the size in theREScolumn in Bytes?
– Thomas
yesterday
add a comment |
Isn't the size in theREScolumn in Bytes?
– Thomas
yesterday
Isn't the size in the
RES column in Bytes?– Thomas
yesterday
Isn't the size in the
RES column in Bytes?– Thomas
yesterday
add a comment |
1 Answer
1
active
oldest
votes
On Linux, a fork()ed process initially references the same memory pages as its parent, in a copy on write scheme. Running multiple copies of the same thing keeps the deduplication ratio very good.
Container memory use is the exact consumption. Its cgroups implementation uses the kernel to track resources. (Same thing applies to other cgroups users like systemd slices.) But hitting the limit by default will invoke the OOM killer.
A practical limit is somewhere in between the observed container utilization and the sum of resident set size. Conservatively, you could start at 500 MB. That is a lot better than uncapped limit of all your memory at 62,000 MB.
answered 14 hours ago
John MahowaldJohn Mahowald
8,0431713
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
On Linux, a fork()ed process initially references the same memory pages as its parent, in a copy on write scheme. Running multiple copies of the same thing keeps the deduplication ratio very good.
Container memory use is the exact consumption. Its cgroups implementation uses the kernel to track resources. (Same thing applies to other cgroups users like systemd slices.) But hitting the limit by default will invoke the OOM killer.
A practical limit is somewhere in between the observed container utilization and the sum of resident set size. Conservatively, you could start at 500 MB. That is a lot better than uncapped limit of all your memory at 62,000 MB.
answered 14 hours ago
John MahowaldJohn Mahowald
8,0431713
add a comment |
On Linux, a fork()ed process initially references the same memory pages as its parent, in a copy on write scheme. Running multiple copies of the same thing keeps the deduplication ratio very good.
Container memory use is the exact consumption. Its cgroups implementation uses the kernel to track resources. (Same thing applies to other cgroups users like systemd slices.) But hitting the limit by default will invoke the OOM killer.
A practical limit is somewhere in between the observed container utilization and the sum of resident set size. Conservatively, you could start at 500 MB. That is a lot better than uncapped limit of all your memory at 62,000 MB.
answered 14 hours ago
John MahowaldJohn Mahowald
8,0431713
add a comment |
On Linux, a fork()ed process initially references the same memory pages as its parent, in a copy on write scheme. Running multiple copies of the same thing keeps the deduplication ratio very good.
Container memory use is the exact consumption. Its cgroups implementation uses the kernel to track resources. (Same thing applies to other cgroups users like systemd slices.) But hitting the limit by default will invoke the OOM killer.
A practical limit is somewhere in between the observed container utilization and the sum of resident set size. Conservatively, you could start at 500 MB. That is a lot better than uncapped limit of all your memory at 62,000 MB.
answered 14 hours ago
John MahowaldJohn Mahowald
8,0431713
On Linux, a fork()ed process initially references the same memory pages as its parent, in a copy on write scheme. Running multiple copies of the same thing keeps the deduplication ratio very good.
Container memory use is the exact consumption. Its cgroups implementation uses the kernel to track resources. (Same thing applies to other cgroups users like systemd slices.) But hitting the limit by default will invoke the OOM killer.
A practical limit is somewhere in between the observed container utilization and the sum of resident set size. Conservatively, you could start at 500 MB. That is a lot better than uncapped limit of all your memory at 62,000 MB.
answered 14 hours ago
John MahowaldJohn Mahowald
8,0431713
answered 14 hours ago
John MahowaldJohn Mahowald
8,0431713
answered 14 hours ago
John MahowaldJohn Mahowald
8,0431713
answered 14 hours ago
John MahowaldJohn Mahowald
8,0431713
8,0431713
add a comment |
add a comment |
speller is a new contributor. Be nice, and check out our Code of Conduct.
speller is a new contributor. Be nice, and check out our Code of Conduct.
speller is a new contributor. Be nice, and check out our Code of Conduct.
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Isn't the size in the
REScolumn in Bytes?– Thomas
yesterday