The performance tag has no wiki summary.
2
votes
2answers
79 views
+250
rsyslog drops messages excessively
We have a CentOS machine acting as our syslog server. I recently noticed that the machine has been dropping large numbers of syslog messages at times. We have over 250 routers and switches, as well ...
2
votes
1answer
345 views
What could cause a NAS mount to respond slowly?
I've a directory on a NAS mount (from NetApp), that contains ~6300 image files, total size of this directory is ~ 300 MB. I get two different performances of time ls:
First time (or after waiting 5-7 ...
6
votes
5answers
286 views
Processor usage increases with 4GB RAM installed
I have an Intel Atom D2700 (Synology NAS DS412+) with 4GB RAM running kernel 3.2.30 x86_64. This unit has a single DIMM slot.
One thing I, and other's have found, is that when adding a 4GB DIMM ...
3
votes
1answer
29 views
How does irqbalance determine which package to use?
irqbalance --debug shows the following:
Package 0: Core 0, 2, 4, 6, 8, 10, 12, 14
Package 1: Core 1, 3, 5, 7, 9, 11, 13
When I run network applications, it seems like IRQs are being handled by ...
1
vote
2answers
53 views
why is filesystem intensive script not faster on ram disk
I have a script which creates a lot of files and directories. The script does black box tests for a program which works with a lot of files and directories. The test count grew and the tests were ...
17
votes
6answers
3k views
Force directory to always be in cache
I've been testing out different methods to improve the time it takes to compile my entire c++ project. Currently it takes ~5 minutes. I experimented with distcc, ccache, and others. Recently, I ...
2
votes
1answer
48 views
Does encrypting my whole Lubuntu slow running programs down?
During the installation of Lubuntu I chose to encrypt my whole HDD (not just the /home folder). Now it feels like my system has slowed down a lot. Especially the startup time of programs increased.
...
2
votes
1answer
102 views
Best way to encrypt my system on an ssd
I consider to buy an ssd for my laptop (something like Samsung 830 or 840) to make the system more responsive. I want my system (at least my home partition) to be encrypted. However I know about ...
0
votes
1answer
30 views
udevadm slow boot
After I upgraded from Slackware 13.70 to 14.0, when the machine is booting, it takes it 15 seconds to execute this line:
/sbin/udevadm trigger --action=add
I understand, that it tries to detect ...
0
votes
1answer
40 views
Open screen in terminal after user login [duplicate]
When a user logins to my Debian server using e.g. Putty, I need to perform the following:
It will automatically execute command screen -r MyWindow, and
the user won't be able to leave the screen ...
4
votes
2answers
227 views
Replace require statements by autoload in .emacs file to improve performance
According to these posts:
How can I make emacs start-up faster
a-nickels-worth.blogspot.de/effective emacs
one can somehow replace require and load statements in the .emacs file to speed up the ...
2
votes
1answer
380 views
Linux disk I/O performance issue — what config options to look at?
We discovered an I/O related performance problem when using the default SLES11 SP2 kernel. Our same application on the same hardware had no issue with (the admittedly ancient SLES9 SP3).
We had a ...
4
votes
1answer
141 views
Linux mutex spins [closed]
On Solaris I can use mpstat to see the smtx (i.e., spins on mutex or in other words locks not acquired on the first try) value. This value increasing indicates that swap is being hit too frequently ...
2
votes
2answers
574 views
slow media - disk cache tuning?
Is there any way to make the system more consistent when using LUKS? (or slow storage in general) as it is everything is snappy until the write buffer is full, then everything grinds to a halt as the ...
4
votes
1answer
62 views
Determining LVM Extent numbers for given file
I'm currently engaged in a non-work related homework exercise. I have an ext4 filesystem sitting on a logical volume. I'm testing different performance tuning strategies and this idea occurred to me. ...
