high load, top shows 70+% I/O wait, iotop shows nothing
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From time to time I experience a strange effect (without any obvious cause):
- My system suddenly gets very slow.
topshows high load (10 to 40 on four cores)topshows I/O wait values mainly from 60% to 80%
Until here it makes sense. But:
topdoes not show a single process inDstate (in CPU usage sort order)iotopshows nearly nothing (<100K/s read from disk, writes are buffered with high commit values anyway), sometimes literally noting.- Nothing interesting in the output of
dmesg.
Now I have closes several applications and half of the tabs in chrome. The system has become usable again – despite a load of 10 and 70% I/O wait. top claims that oon average 1 to 2 processes were running. With 80% I/O wait two processes make a load of ten. So at least that makes sense but where does the load / I/O wait come from?
environment
- This is openSUSE Tumbleweed
- It has been running for 33 days
- The system has 24G RAM, 4 of which are free yet (completely free, in addition to the 6G page cache)
linux top cpu-usage load iotop
asked Apr 19 at 20:41
Hauke Laging
53.2k1282130
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From time to time I experience a strange effect (without any obvious cause):
- My system suddenly gets very slow.
topshows high load (10 to 40 on four cores)topshows I/O wait values mainly from 60% to 80%
Until here it makes sense. But:
topdoes not show a single process inDstate (in CPU usage sort order)iotopshows nearly nothing (<100K/s read from disk, writes are buffered with high commit values anyway), sometimes literally noting.- Nothing interesting in the output of
dmesg.
Now I have closes several applications and half of the tabs in chrome. The system has become usable again – despite a load of 10 and 70% I/O wait. top claims that oon average 1 to 2 processes were running. With 80% I/O wait two processes make a load of ten. So at least that makes sense but where does the load / I/O wait come from?
environment
- This is openSUSE Tumbleweed
- It has been running for 33 days
- The system has 24G RAM, 4 of which are free yet (completely free, in addition to the 6G page cache)
linux top cpu-usage load iotop
asked Apr 19 at 20:41
Hauke Laging
53.2k1282130
"top does not show a single process in D state" -- are you running it astop -Hso you see threads? Also dof,s,q,Shift+Rto sort by process state and putDat the top. Or useps axH | awk '$7 ~ /D/ print '
– Patrick
Apr 20 at 2:51
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
From time to time I experience a strange effect (without any obvious cause):
- My system suddenly gets very slow.
topshows high load (10 to 40 on four cores)topshows I/O wait values mainly from 60% to 80%
Until here it makes sense. But:
topdoes not show a single process inDstate (in CPU usage sort order)iotopshows nearly nothing (<100K/s read from disk, writes are buffered with high commit values anyway), sometimes literally noting.- Nothing interesting in the output of
dmesg.
Now I have closes several applications and half of the tabs in chrome. The system has become usable again – despite a load of 10 and 70% I/O wait. top claims that oon average 1 to 2 processes were running. With 80% I/O wait two processes make a load of ten. So at least that makes sense but where does the load / I/O wait come from?
environment
- This is openSUSE Tumbleweed
- It has been running for 33 days
- The system has 24G RAM, 4 of which are free yet (completely free, in addition to the 6G page cache)
linux top cpu-usage load iotop
asked Apr 19 at 20:41
Hauke Laging
53.2k1282130
From time to time I experience a strange effect (without any obvious cause):
- My system suddenly gets very slow.
topshows high load (10 to 40 on four cores)topshows I/O wait values mainly from 60% to 80%
Until here it makes sense. But:
topdoes not show a single process inDstate (in CPU usage sort order)iotopshows nearly nothing (<100K/s read from disk, writes are buffered with high commit values anyway), sometimes literally noting.- Nothing interesting in the output of
dmesg.
Now I have closes several applications and half of the tabs in chrome. The system has become usable again – despite a load of 10 and 70% I/O wait. top claims that oon average 1 to 2 processes were running. With 80% I/O wait two processes make a load of ten. So at least that makes sense but where does the load / I/O wait come from?
environment
- This is openSUSE Tumbleweed
- It has been running for 33 days
- The system has 24G RAM, 4 of which are free yet (completely free, in addition to the 6G page cache)
linux top cpu-usage load iotop
asked Apr 19 at 20:41
Hauke Laging
53.2k1282130
asked Apr 19 at 20:41
Hauke Laging
53.2k1282130
asked Apr 19 at 20:41
Hauke Laging
53.2k1282130
asked Apr 19 at 20:41
Hauke Laging
53.2k1282130
53.2k1282130
"top does not show a single process in D state" -- are you running it astop -Hso you see threads? Also dof,s,q,Shift+Rto sort by process state and putDat the top. Or useps axH | awk '$7 ~ /D/ print '
– Patrick
Apr 20 at 2:51
add a comment |Â
"top does not show a single process in D state" -- are you running it astop -Hso you see threads? Also dof,s,q,Shift+Rto sort by process state and putDat the top. Or useps axH | awk '$7 ~ /D/ print '
– Patrick
Apr 20 at 2:51
"top does not show a single process in D state" -- are you running it as
top -H so you see threads? Also do f, s, q, Shift+R to sort by process state and put D at the top. Or use ps axH | awk '$7 ~ /D/ print '– Patrick
Apr 20 at 2:51
"top does not show a single process in D state" -- are you running it as
top -H so you see threads? Also do f, s, q, Shift+R to sort by process state and put D at the top. Or use ps axH | awk '$7 ~ /D/ print '– Patrick
Apr 20 at 2:51
add a comment |Â
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"top does not show a single process in D state" -- are you running it as
top -Hso you see threads? Also dof,s,q,Shift+Rto sort by process state and putDat the top. Or useps axH | awk '$7 ~ /D/ print '– Patrick
Apr 20 at 2:51