12
votes
1answer
399 views

ext4 listing of files very slow in one specific directory that contained lots of files before

Background I had a small logrotate misshap... Logrotate would rotate the archived logs by misstake causing a quadratic growth of files in my /var/log/. And by the time I caught wind that something ...
0
votes
1answer
161 views

strace vs. log4cxx performance hit?

I need to debug some issue on a production server, and I'm trying to decide whether to use strace or the log4cxx logging library; one crucial characteristic I need to know before, is which of the two ...
4
votes
3answers
3k views

How can I find out where a file is physically located on the disk (block numbers)?

This is an obscure question, I know. I'm trying to do some performance testing of some disks on a Linux box. I'm getting some inconsistent results, running the same test on the same disk. I know ...
1
vote
1answer
455 views

Debug tips for intermittent slow responses from Confluence

I've started seeing a situation on our internal Atlassian Confluence instance where we get snappy performance most of the time, but a couple of times an hour requests (both read and write operations) ...
0
votes
1answer
290 views

Simple MySQL query locking up until database restart

I have a very simple query that runs in 216ms on my development machine but was taking more than 45 seconds on my production server, that is, until I restarted MySQL there: UPDATE `forum_categories` ...
1
vote
3answers
4k views

How do I identify slow queries in sql server?

I've found long, complicated instructions like this when googling for the answer to this question, an brief reference links such as in this post. I'm looking for a succinct a procedure as possible to ...
0
votes
1answer
75 views

Will logging debugging incur a performance hit if I don't turn debugging on?

On a Cisco device, I know that enabling debugging can incur a performance hit since debugging has such a high priority on the CPU. I know that to log debugging, you have to set logging up to the ...
5
votes
4answers
6k views

How can I find out what is causing interrupts on Windows?

Occasionally I come across servers (Windows 2003 and 2008) with high processor % interrupt time. Is there a way to see what program or device is causing the interrupts?
1
vote
2answers
236 views

OpenSolaris/x86 responding sluggishly - frequent freezing

The system starts up fine, and for about 5 minutes (est.) things are fine. Then the system starts to get very sluggish ("choppy"): the mouse will freeze for two or three seconds, then release for ...