Comments on: Bottlenecks: Part 1 of 4 http://www.performanceengineer.com/blog/bottlenecks-part-1-of-4/ Software Performance Engineering & Testing Fri, 13 Aug 2010 19:46:16 -0700 http://wordpress.org/?v=2.8.4 hourly 1 By: Bikash http://www.performanceengineer.com/blog/bottlenecks-part-1-of-4/comment-page-1/#comment-287 Bikash Mon, 18 Aug 2008 09:09:28 +0000 #comment-287 Hi, Really it is good one. can u plz send me some material or name of the sites where i can find all the bottlenecks that an application have faced and how to fixed that type of problems. I am using loadruner tool as for performance testing. Hi,
Really it is good one. can u plz send me some material or name of the sites where i can find all the bottlenecks that an application have faced and how to fixed that type of problems. I am using loadruner tool as for performance testing.

]]> By: joychester http://www.performanceengineer.com/blog/bottlenecks-part-1-of-4/comment-page-1/#comment-47 joychester Fri, 21 Dec 2007 09:22:01 +0000 #comment-47 When I found some CPU bottleneck which is over 90% utilization, then I will monitor which part of class or method is called most frequently and cost most of time to process. so adding CPU is an easiest way but we cover some potiential issue by that way :) Cheng Chi Performance engineer When I found some CPU bottleneck which is over 90% utilization, then I will monitor which part of class or method is called most frequently and cost most of time to process.

so adding CPU is an easiest way but we cover some potiential issue by that way :)

Cheng Chi
Performance engineer

]]> By: Chuck http://www.performanceengineer.com/blog/bottlenecks-part-1-of-4/comment-page-1/#comment-3 Chuck Sat, 21 Apr 2007 02:01:00 +0000 #comment-3 Thanks, Martin, you bring up some interesting points. I will clarify the article to say that bottlenecks fall in 4 different <i>areas</i> rather than types. The bottlenecks you mentioned would fall into one of the 4 areas mentioned. For example, on Solaris, OS interrupts are handled by a single CPU (or hardware thread for T1 architecture) as you point out, but this would be detected as a CPU bottleneck when you monitor the individual CPU utilization. Thanks, Martin, you bring up some interesting points. I will clarify the article to say that bottlenecks fall in 4 different areas rather than types. The bottlenecks you mentioned would fall into one of the 4 areas mentioned. For example, on Solaris, OS interrupts are handled by a single CPU (or hardware thread for T1 architecture) as you point out, but this would be detected as a CPU bottleneck when you monitor the individual CPU utilization.

]]> By: Martin Roth http://www.performanceengineer.com/blog/bottlenecks-part-1-of-4/comment-page-1/#comment-2 Martin Roth Fri, 20 Apr 2007 07:21:49 +0000 #comment-2 Actually, there are also more CPU bottlenecks than exceeding 80% on a SMP machine. E.g. on SUN Solaris clusters, the network driver is handled by a single CPU (in order to ensure that packets are handled in proper order), which leads to overload of a this CPU when there are many packets / s - even though the average CPU load is below 60%. Actually, there are also more CPU bottlenecks than exceeding 80% on a SMP machine. E.g. on SUN Solaris clusters, the network driver is handled by a single CPU (in order to ensure that packets are handled in proper order), which leads to overload of a this CPU when there are many packets / s – even though the average CPU load is below 60%.

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