VM v Physical Server Speeds Post: 302924533

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Top Forums UNIX for Dummies Questions & Answers VM v Physical Server Speeds Post 302924533 by drl on Monday 10th of November 2014 11:06:46 AM

11-10-2014

Registered User

Hi.

The only benchmark that makes any sense to me is your normal workload.

Suppose IT gave you a VM that allowed twice as many CPUs and/or a worderful array of SSD disks as you have on your physical machine, and that it allowed your workload to be processed in far less time on the VM. That would be a definite plus.

At a university computer center, whenever we would make changes, we would run a sample of user applications. If we saw a large increase or decrease in real time, we would look closely to try to determine the cause (it was almost always a failure of new code, many cases would crash, decreasing the real time, etc.).

Running benchmarks for a few megabytes would not be meaningful for me. I have run bonnie++ on different configurations (various RAID combinations, for example), so that might be useful if you let it run long enough -- 20-60 minutes on your physical machine, then compare it to runs on the VM.

Synthetic benchmarks are useful if they are similar to your day-to-day work, otherwise, they are perhaps better suited for water-cooler discussions.

While working at an NSF-funded lab, one book I referred to was The Art of Computer Systems Performance Analysis: Techniques for Experimental Design, Measurement, Simulation, and Modeling: Raj Jain: 9780471503361: Amazon.com: Books
See especially chapter 4, techniques and tools, but note that this is quite an old book.

Best wishes ... cheers, drl

drl

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filebench

filebench(1)							   USER COMMANDS						      filebench(1)

NAME

       filebench - interprets WML script and generates appropriate filesystem workload

SYNOPSIS

       filebench [-f <filename>] [-h]

DESCRIPTION

       Filebench is a file system and storage benchmark that allows to generate a large variety of workloads. Unlike typical benchmarks it is very
       flexible and allows to minutely specify (any) applications' behaviour using extensive Workload Model Language (WML). Filebench  uses  load-
       able  workload  personalities  to  allow easy emulation of complex applications (e.g., mail, web, file, and database servers). Filebench is
       quick to set up and easy to use compared to deploying real applications. It is also a handy tool for micro-benchmarking.

       Filebench includes many features to facilitate file system benchmarking:

       o Multiple workload types support via loadable personalities

       o Ships with more than 40 pre-defined personalities, including the one that describe mail, web, file, and database servers behaviour

       o Easy to add new personalities using reach Workload Model Language (WML)

       o Multi-process and multi-thread workload support

       o Configurable directory hierarchies with depth, width, and file sizes set to given statistical distributions

       o Support of asynchronous I/O and process synchronization primitives

       o Integrated statistics for throughput, latency, and CPU cycle counts per system call

OPTIONS

       -f <filename>
	      use specified file as an input instead of stdin

       -h     Display verbose help

EXAMPLES

       Run filebench interactively:

       $ filebench
	      Start filebench interactive shell, filebench prompt will appear after that.

       filebench> load fileserver
	      Load fileserver personality using load command.

       filebench> set $dir=/mnt
	      After personality is loaded, tunables of the workload personality can be set. Here we change the benchmark directory to  /mnt  where
	      the file system we want to benchmark is presumably mounted.

       filebench> run 60
	      Start workload for 60 seconds. After 60 seconds of the run the statistics is printed and Filebench exits.

       Run filebench non-interactively:

       filebench -f /usr/share/filebench/workloads/fileserver.f
	      Run  filebench  non-interactively,  however, you need to add 'run <time>' to the end of the workload personality file before calling
	      filebench.

EXIT STATUS

       0 if OK,

       1 if workload file is not found.

REPORTING BUGS

       http://sourceforge.net/tracker/?group_id=133644&atid=727883

revision 01							    Sep 1, 2011 						      filebench(1)

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