Download HP-UX 11i Tuning and Performance (2nd Edition) by Robert F. Sauers PDF

By Robert F. Sauers

Maximizing the functionality of Unix structures is a problem that calls for a really good knowing of working process habit and an intimate acquaintance with approach instruments that help in tuning. This publication is helping sysadmins, internet admins, builders, and means planners maximize the functionality of HP-UX platforms, unravel bottlenecks, and layout functions for optimum functionality. HP-UX 11i Tuning and function takes the guesswork out of maximizing HP-UX functionality. It presents a accomplished, systematic functionality administration technique that addresses each level within the lifecycle of an HP-UX approach. 3 of HP's prime functionality specialists current particular metrics, signs, and suggestions for every key component of an HP-UX approach, together with undefined, the OS platform, and alertness improvement. This variation is totally up to date with the various new processor and procedure households that use HP-UX because the first variation seemed in 1999. This e-book introduces the easiest regular UNIX and HP-UX particular instruments for functionality administration and demonstrates functional how one can software HP-UX platforms in order that your measurements really characterize real-world functionality. This new version additionally takes into consideration the most recent processors, platforms, garage units, I/O connections, new and adjusted software program instruments, new HP-UX good points, excessive availability environments, and Java on HP-UX.

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Additional info for HP-UX 11i Tuning and Performance (2nd Edition) (Hewlett-Packard Professional Books (Paperback))

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After I analyzed the system for several hours, the problem occurred. I asked my host to take me to the people whom I had noted were consuming a lot of system resources. I found that one user was running a batch reporting job. After asking to look at the job, I determined that the job locked the entire database when it ran. It then became a very simple task of changing the locking mode from database to table or row. Suddenly performance for all of the users improved to the normal level. 6 Capacity Planning 30 Amazon don't be afraid of buying books Next 31 Capacity planning techniques may also be a part of the performance professional's job.

The tool chosen should be useful in diagnosing the performance issue at hand. 5 Metric Documentation There are several hundred performance metrics available from the kernel. These metrics were developed over time, and some are better documented than others. Some of the metrics may have a one-line description that is incomprehensible. Only by reviewing kernel source code can one hope to determine the meaning of some of the more esoteric metrics. Of course, the availability of kernel source code is limited, as is the desire to review it.

The counters are accessed only via low-level instructions. Only the performance tool Caliper has the ability to access these counters. 3 Internal Software Monitors Internal software monitors are created by placing instrumentation points within the source code of the operating system kernel or the application code to acquire the performance data. Advantages (+) and disadvantages (-) of software instrumentation are as follows: + Relatively easy to implement + Easy to monitor many different resources, including networks + Easy to link individual processes with the data 46 47 + Can easily be turned on or off + Can run safely in production environments + Runs on various models of CPU without change + Gives very accurate measures of transaction response time based on the application's definition of a transaction + Conducive to general purpose software analysis tools - Is invasive to the operating system - Contends for the same resources that it is measuring, which affects accuracy Data from internal software monitors is so general purpose and easy to analyze that this kind of instrumentation is quite common on Unix systems.

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