… to see you gave one session on – Extracting Scalability and Performance Metrics from TCP Traffic in Surge Conference 2011. Is there any…
Post: Testing Samsung SSD SATA 256GB 830 - not all SSD created equal
April 25, 2012 By 10 Comments
… the most popular. I do not particularly like its write performance – I wrote about it before, that’s why I am… way in the Linux asynchronous IO library to get time metrics for particular IO block. so my testing command line looks… run You may see I gather metrics every 10 sec to see how stable the performance is, and it really helps to…
Post: Testing STEC SSD MACH16 200GB SLC
April 25, 2012 By 7 Comments
… way in the Linux asynchronous IO library to get time metrics for particular IO block. so my testing command line looks… run You may see I gather metrics every 10 sec to see how stable the performance is, and it really helps to…
Post: The two even more fundamental performance metrics
May 5, 2011 By 6 Comments
… a recent blog post, I wrote about four fundamental metrics for system performance analysis. These are throughput, residence time, “weighted time” (the…. I derived all of these metrics from two “even more fundamental” performance metrics, which I’ll call the “basic” metrics. That’s what this… it. Ladies and gentlemen (drum roll please), the two basic performance metrics: Arrival time Completion time If we know the instant in…
Post: The four fundamental performance metrics
April 27, 2011 By 15 Comments
… are equal. All together, we have the following four fundamental metrics: The observation interval. The number of queries in the interval… powerful. These are the key metrics we need to model scalability with the Universal Scalability Law, perform queueing analysis, and do capacity… more. We derived our four long-term average metrics from the four fundamental metrics, and we derived those in turn from the…
Post: Followup on performance metrics: slides, video
July 11, 2011 By 6 Comments
… extract an amazing amount of information about a system’s performance, scalability, queueing, and more by just measuring request arrivals and… a more complete description of how to analyze MySQL’s performance and scalability through nothing more than TCP/IP packet headers…
Post: Understanding Performance Optimization Terminology
March 2, 2009 By Leave a Comment
…. Performance – The performance comes down to performing up to users expectations (or expectations of your boss) which drills down to two important metrics – response… I would define Scalability as ability to increase or sustain performance as response to the environment changes. Efficiency This is my…
Comment: The four fundamental performance metrics
April 27, 2011 By 15 Comments
… to my blog http://perfdynamics.blogspot.com/2011/05/fundamental-performance-metrics.html They show how to do dimensional analysis and also… all modern hypervisors. The privately defined performance metrics were absolutely incomprehensible; not the least because even conventional metrics, like utilization, were privately redefined…
Comment: The four fundamental performance metrics
April 27, 2011 By 15 Comments
… period (T) that you (the user, sysadm) choose in whatever performance tool you are using. *Period* here means *interval*: the sampling… term “performance metrics” over the oft-used “performance statistics” to remind myself that we first must have reliable and meaningful base metrics or measurements…
Post: Using LoadAvg for Performance Optimization
December 4, 2006 By 4 Comments
… of CPUs and Disks – system may be quite idle and performance still poor because application is not parallel enough. Similar situations… the box it will perform well as soon as you need to do a lot of queuing performance starts to suffer. Let… the task. It is just almost always available unlike other metrics. It is best to have profiling information so you can…
