Questions tagged [tuning]
The tuning tag has no summary.
23 questions
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NFS v4.2 tuning
https://www.youtube.com/watch?v=JXASmxGrHvY
at 5:30 the statement is made
if you get NFS tuned just right it is incredibly fast for ultra small file transfers*...
at 6:05
I've heard of 4.0GB/sec ...
- 9,092
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2
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569
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How to use vm.overcommit_memory=1 without getting system hung?
I am using vm.overcommit_memory=1 on my linux system which has been helpful to allow starting multiple applications which otherwise wouldn't even start with default value of 0, however, sometimes my ...
- 3
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sysctl prameters seem not working on a VM
I am trying to tune my servers performance. To do so, I wanted to test some sysctl prameters such as net.core.somaxconn, net.ipv4.tcp_max_syn_backlog and net.core.netdev_max_backlog.
Following were my ...
- 11
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How to minimize filesystem overhead
I have an application that uses a lot of space as essentially cache data. The more cache available the better the application performs. We're talking hundreds to thousands of TB. The application can ...
- 138
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Where to get offline documentation/descriptions of individual sysctl kernel tunable parameters?
The NOTES section of $ man 5 sysctl.conf states: The description of individual parameters can be found in the kernel documentation.
But is there a way for me to find this kernel documentation offline? ...
- 145
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7k
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What's the best dirty_background_ratio and dirty_ratio for my usage?
So I'm playing with dirty_background_ratio and dirty_ratio and hoping to find the right parameters with your professional help.
For now I'm using:
vm.dirty_background_ratio = 20
vm.dirty_ratio = 60
...
- 217
1
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1
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883
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How to find max limit of /proc/sys/fs/file-max
I am running Jenkins with lots of jobs which require lots of open files so I have increased file-max limit to 3 million. It still hits 3 million sometimes so I am wondering how far I can go. Can I set ...
- 1,672
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tune2fs for f2fs
Is there a tool for editing (and viewing) the file system features for f2fs just like tune2fs for ext234?
For instance you can get summarized info about the corresponding extX partition:
# tune2fs -...
user252842
16
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2
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20k
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How to change the length of time-slices used by the Linux CPU scheduler?
Is it possible to increase the length of time-slices, which the Linux CPU scheduler allows a process to run for? How could I do this?
Background knowledge
This question asks how to reduce how ...
- 53.5k
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is there any way to increase spawn rate of MinSpareServers in apache prefork
My server faces huge traffic only for short duration every day. And I don't want to waste my resource by running high amount of MaxSpareServers throughout the day.
So, I would like to know is there ...
- 9,252
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1k
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CentOS 7 - When THP is disabled is it safe to ignore defrag setting?
I need to disable THP (Transparent Huge Pages). Many tutorials on the web advise to set never (0 for last one) value for below options.
/sys/kernel/mm/transparent_hugepage/enabled
/sys/kernel/mm/...
- 151
2
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1
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697
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slow/frozen ext4 // task sync blocked on big mostly write only server
We have several 90TB servers (Areca RAID-6 partitioned into 10 ext4 partitions)
The application is basically a ring buffer; continuously writing data and deleting old data. As such, each partition is ...
- 653
2
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1
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2k
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How can I create my own custom progress bar in Conky?
I have started using Conky some days ago, and I'm willing to create my own configuration. I have added some colors, cool ASCII art and learned the basics.
However, I don't like the default progress ...
- 289
4
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509
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systemd slices even with low CPUShare heavily affect system responsiveness
I've created custom slice (so now I have 4 slices user, system, machine, important) and assigned huge number to CPUShares. System felt really unresponsive under high load in this slice, what seems to ...
- 1,363
1
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1
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294
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Fast filesystem for virtual backup environments
I know filesystem supporters war is behind the corner and there are plenty of fine tuning guide for each filesystem in the wild, so please stick to the specifications: I'm asking what would you ...
- 565