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Commands taking very long time to execute on ssh
sudo taking long timeLinux freezes every few secondsMySQL Binary Log activated = high-end server damn slowMysqld increases the load on the CPU and drops after flush-tablesHow can I prevent a DDOS attack on Amazon EC2?SSH - set env vairables by every connection - godaddy shared hostHadoop commands are taking a very long time to returnSSH unresponsive after stopping Tomcat, many ksoftirqd CPU usageMySQL gradually slows down until server rebootsudden peak in cpu usage
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Strangely on few on my linux servers, intermittently, when i try to login through ssh and run commands, they take about 15-30 secs to execute every command. Every commands is executed very slow.
But as soon as the command executes, then it performs normal funtion, (i mean does not slows down).
I have checked, CPU, RAM, IO, Network, everything is in normal condition. so what could be the issue?
linux performance
asked Sep 12 '14 at 18:15
FarhanFarhan
3,32843567
|
show 1 more comment
Strangely on few on my linux servers, intermittently, when i try to login through ssh and run commands, they take about 15-30 secs to execute every command. Every commands is executed very slow.
But as soon as the command executes, then it performs normal funtion, (i mean does not slows down).
I have checked, CPU, RAM, IO, Network, everything is in normal condition. so what could be the issue?
linux performance
asked Sep 12 '14 at 18:15
FarhanFarhan
3,32843567
Are you doing a "ssh server command" or do you first login, and then run the command?
– andol
Sep 12 '14 at 18:20
3
Please post the output ofstrace -r command(where command is the simplest command you can think of that is hanging like that, ls?)
– Giovanni Tirloni
Sep 12 '14 at 18:23
even when i run strace,its skeeps for long time
– Farhan
Sep 12 '14 at 18:29
1
strace doesn't make it go faster, strace is a diagnostic tool that shows you what is going slow. You actually should look at the output and see what part is slow. If you don't know how to interpret the output then add it to your question.
– Zoredache
Sep 12 '14 at 18:46
1
If you're running CentOS or RHEL 6, try stickingoptions single-request-reopeninto /etc/resolv.conf on your systems. I had a similar problem and it turned out to be caused by DNS lookups timing out. Background
– yoonix
Sep 12 '14 at 18:49
|
show 1 more comment
Strangely on few on my linux servers, intermittently, when i try to login through ssh and run commands, they take about 15-30 secs to execute every command. Every commands is executed very slow.
But as soon as the command executes, then it performs normal funtion, (i mean does not slows down).
I have checked, CPU, RAM, IO, Network, everything is in normal condition. so what could be the issue?
linux performance
asked Sep 12 '14 at 18:15
FarhanFarhan
3,32843567
Strangely on few on my linux servers, intermittently, when i try to login through ssh and run commands, they take about 15-30 secs to execute every command. Every commands is executed very slow.
But as soon as the command executes, then it performs normal funtion, (i mean does not slows down).
I have checked, CPU, RAM, IO, Network, everything is in normal condition. so what could be the issue?
linux performance
linux performance
asked Sep 12 '14 at 18:15
FarhanFarhan
3,32843567
asked Sep 12 '14 at 18:15
FarhanFarhan
3,32843567
asked Sep 12 '14 at 18:15
FarhanFarhan
3,32843567
asked Sep 12 '14 at 18:15
FarhanFarhan
3,32843567
asked Sep 12 '14 at 18:15
FarhanFarhan
3,32843567
3,32843567
Are you doing a "ssh server command" or do you first login, and then run the command?
– andol
Sep 12 '14 at 18:20
3
Please post the output ofstrace -r command(where command is the simplest command you can think of that is hanging like that, ls?)
– Giovanni Tirloni
Sep 12 '14 at 18:23
even when i run strace,its skeeps for long time
– Farhan
Sep 12 '14 at 18:29
1
strace doesn't make it go faster, strace is a diagnostic tool that shows you what is going slow. You actually should look at the output and see what part is slow. If you don't know how to interpret the output then add it to your question.
– Zoredache
Sep 12 '14 at 18:46
1
If you're running CentOS or RHEL 6, try stickingoptions single-request-reopeninto /etc/resolv.conf on your systems. I had a similar problem and it turned out to be caused by DNS lookups timing out. Background
– yoonix
Sep 12 '14 at 18:49
|
show 1 more comment
Are you doing a "ssh server command" or do you first login, and then run the command?
– andol
Sep 12 '14 at 18:20
3
Please post the output ofstrace -r command(where command is the simplest command you can think of that is hanging like that, ls?)
– Giovanni Tirloni
Sep 12 '14 at 18:23
even when i run strace,its skeeps for long time
– Farhan
Sep 12 '14 at 18:29
1
strace doesn't make it go faster, strace is a diagnostic tool that shows you what is going slow. You actually should look at the output and see what part is slow. If you don't know how to interpret the output then add it to your question.
– Zoredache
Sep 12 '14 at 18:46
1
If you're running CentOS or RHEL 6, try stickingoptions single-request-reopeninto /etc/resolv.conf on your systems. I had a similar problem and it turned out to be caused by DNS lookups timing out. Background
– yoonix
Sep 12 '14 at 18:49
Are you doing a "ssh server command" or do you first login, and then run the command?
– andol
Sep 12 '14 at 18:20
Are you doing a "ssh server command" or do you first login, and then run the command?
– andol
Sep 12 '14 at 18:20
3
3
Please post the output of
strace -r command (where command is the simplest command you can think of that is hanging like that, ls?)– Giovanni Tirloni
Sep 12 '14 at 18:23
Please post the output of
strace -r command (where command is the simplest command you can think of that is hanging like that, ls?)– Giovanni Tirloni
Sep 12 '14 at 18:23
even when i run strace,its skeeps for long time
– Farhan
Sep 12 '14 at 18:29
even when i run strace,its skeeps for long time
– Farhan
Sep 12 '14 at 18:29
1
1
strace doesn't make it go faster, strace is a diagnostic tool that shows you what is going slow. You actually should look at the output and see what part is slow. If you don't know how to interpret the output then add it to your question.
– Zoredache
Sep 12 '14 at 18:46
strace doesn't make it go faster, strace is a diagnostic tool that shows you what is going slow. You actually should look at the output and see what part is slow. If you don't know how to interpret the output then add it to your question.
– Zoredache
Sep 12 '14 at 18:46
1
1
If you're running CentOS or RHEL 6, try sticking
options single-request-reopen into /etc/resolv.conf on your systems. I had a similar problem and it turned out to be caused by DNS lookups timing out. Background– yoonix
Sep 12 '14 at 18:49
If you're running CentOS or RHEL 6, try sticking
options single-request-reopen into /etc/resolv.conf on your systems. I had a similar problem and it turned out to be caused by DNS lookups timing out. Background– yoonix
Sep 12 '14 at 18:49
|
show 1 more comment
1 Answer
1
active
oldest
votes
Check swap memory(free -h) utilization.
If some processes consume high amounts of swap memory this may cause slowness of the system which in turn takes more time to execute commands.
edited Mar 26 at 12:37
Tommiie
4,1812637
answered Mar 26 at 1:51
user9219304user9219304
1
add a comment |
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Check swap memory(free -h) utilization.
If some processes consume high amounts of swap memory this may cause slowness of the system which in turn takes more time to execute commands.
edited Mar 26 at 12:37
Tommiie
4,1812637
answered Mar 26 at 1:51
user9219304user9219304
1
add a comment |
Check swap memory(free -h) utilization.
If some processes consume high amounts of swap memory this may cause slowness of the system which in turn takes more time to execute commands.
edited Mar 26 at 12:37
Tommiie
4,1812637
answered Mar 26 at 1:51
user9219304user9219304
1
add a comment |
Check swap memory(free -h) utilization.
If some processes consume high amounts of swap memory this may cause slowness of the system which in turn takes more time to execute commands.
edited Mar 26 at 12:37
Tommiie
4,1812637
answered Mar 26 at 1:51
user9219304user9219304
1
Check swap memory(free -h) utilization.
If some processes consume high amounts of swap memory this may cause slowness of the system which in turn takes more time to execute commands.
edited Mar 26 at 12:37
Tommiie
4,1812637
answered Mar 26 at 1:51
user9219304user9219304
1
edited Mar 26 at 12:37
Tommiie
4,1812637
edited Mar 26 at 12:37
Tommiie
4,1812637
edited Mar 26 at 12:37
Tommiie
4,1812637
4,1812637
answered Mar 26 at 1:51
user9219304user9219304
1
answered Mar 26 at 1:51
user9219304user9219304
1
answered Mar 26 at 1:51
user9219304user9219304
1
1
add a comment |
add a comment |
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Are you doing a "ssh server command" or do you first login, and then run the command?
– andol
Sep 12 '14 at 18:20
3
Please post the output of
strace -r command(where command is the simplest command you can think of that is hanging like that, ls?)– Giovanni Tirloni
Sep 12 '14 at 18:23
even when i run strace,its skeeps for long time
– Farhan
Sep 12 '14 at 18:29
1
strace doesn't make it go faster, strace is a diagnostic tool that shows you what is going slow. You actually should look at the output and see what part is slow. If you don't know how to interpret the output then add it to your question.
– Zoredache
Sep 12 '14 at 18:46
1
If you're running CentOS or RHEL 6, try sticking
options single-request-reopeninto /etc/resolv.conf on your systems. I had a similar problem and it turned out to be caused by DNS lookups timing out. Background– yoonix
Sep 12 '14 at 18:49