Browsing articles tagged with "performance - 3/65 - Admins Goodies"
May 28, 2012
tom

Ridiculously slow queries on Microsoft SQL Server 2008 R2

I’m getting really slow queries in MS SQL Server 2008 R2 on my dev machine. This problem has been plaguing me for about a month. Other developers don’t have the same problem, but we all run the same code. It seems to be that any query that includes a JOIN takes >20s, some taking up to a minute. Inserts and updates are fast. The total database size is about 30MB, so it’s hardly huge. During […]

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May 25, 2012
tom

Performance issues with Exchange 2007 and Outlook 2010

In my environment, I have Exchange 2007, ccr environment with 2 MB, 2 HT, and 2 CAS servers. We are currently using Outlook 2010 as our email client for the terminal server. The client is configured to connect directly to exchange, not cached mode. Lately our users have complaints about speeds and performance in Outlook 2010, such as when they select a folder, it takes the server several minutes for the folder to display the […]

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May 21, 2012
tom

Adding extra processor post-installation versus installing on two – 2008 R2

I have a Windows Server 2003 installation which is getting pretty long in the tooth, so I have decided to install Windows Server 2008 R2 Standard instead. I have verified that the server is capable of running the OS, and everything is set. At the same time, I’m considering installing an extra processor, but the delivery takes a few days. And now for the question: Is there a difference in the potential performance of an […]

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May 10, 2012
tom

OS X tools for testing & visualizing network performance between two points

A client of mine has had intermittent network issues between their office and their server hosted on AWS. A speedtest (at speedtest.net) shows their bandwidth is fine. When I test their server, from a different location, the speed is fine – works on my machine. Can you recommend any tools for OS X which will allow them to visualize connection performance between their location and the host? Ease of use is important – they are not command […]

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May 5, 2012
tom

Ngix vs G-WAN for static content?

Can someone point me to recent benchmarks on the two? Also more info about G-WAN would be nice, since up until now I never heard about it. I need the fastest server for static files. Asked by ilija139 This link states that G-WAN can scale better than nginx and it can benefit more from multi-core CPUs and uses less resources. You can have a look at the architecture and performance sections. In my opinion, I […]

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May 2, 2012
tom

Unable to increase the dynamic port range on Windows Server 2008

I’m trying to “tune” the TCP/IP stack on some Windows Server 2008 machines by following the instructions here: http://www.outsystems.com/NetworkForums/ViewTopic.aspx?TopicId=6956&Topic=How-to-tune-the-TCP%2FIP-stack-for-high-volume-of-web-requests One of the suggestions is to increase the dynamic port range and I’ve tried doing so but it fails: C:\Windows\system32>netsh int ipv4 set dynamicportrange tcp start=32767 num=65535 The parameter is incorrect. My question is: which parameter is incorrect? Asked by Lirik You have to run: netsh int ipv4 set dynamicport tcp start=32765 num=32765 This would set […]

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Apr 27, 2012
tom

Apache2 on linux – how to track down performance trouble

I am stuck on this topic for a while now: How can I get more details on where response time burns. My Problem is the extreme variance in response times. Sometimes it takes the server 5 or 10 seconds or more to respond (esp. for the first call). Firebug marks this time mostly as “waiting”. When I check localhost/server-status (where this delay occurs as well), most slots are occupied – but half a second later, […]

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Apr 26, 2012
tom

How to track down uncertain httpd/mysqld activity

I’m running a pretty standard LAMP stack on Fedora 15, mostly in support of some Drupal sites. Things generally seem to be running fine, but occasionally the disk on the machine will start to work noticeably harder than it usually does. My limited system debugging skills have found this: ‘top’ reports that httpd and mysqld are indeed active, taking up maybe 3-4% of what is otherwise a mostly idle machine. There are no changes in […]

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Apr 26, 2012
tom

Iozone is producing false results

I am not sure why this is happening but these are totally false results: Children see throughput for 15 re-readers = 12793134.62 KB/sec Parent sees throughput for 15 re-readers = 12753940.84 KB/sec Min throughput per process = 515695.50 KB/sec Max throughput per process = 1088000.75 KB/sec Avg throughput per process = 852875.64 KB/sec Min xfer = 249856.00 KB Children see throughput for 15 random readers = 12667347.75 KB/sec Parent sees throughput for 15 random readers […]

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Apr 25, 2012
tom

Optimized LAMP/LEMP stack scripts

In the “let’s try not to reinvent the wheel” perspective, I’ve been looking for a packaged LAMP (or LEMP) stack for some time now, not only the basic Mysql, Apache , PHP etc… but ideally stuff like APC, Postfix… basically something that would implement recognized practices & standard for security, general performance. A standard default installation that would work out of the box with all the bells & whistles that one would need to get […]

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