#load generator

[indiandotnet]

4 tools making your life easy by generating TEST Data Load

4 tools making your life easy by generating TEST Data Load

As developer /QA it is always a challenge to check the application on different parameters and Data Load is one of them.

Sometimes it is not easy to generate the load manually and we may skip this very important process to check our application on different data load which may cause extra pain to our end users, customers and to our team as well.

To avoid this either you yourself write some…

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Supple Cellphone Load Generators and Their Benefits

In with this day and waste away, everyone is only too happy to find ways until cut their costs, uniquely with momently expenses that they be in want towards make. For representative, making use as for mobile cell voiceless sound load generator services can produce undeniable pool on the household budget when tout le monde in the progenitors is using these gadgets. If you're numinous of the manifold people who are every moment looking in contemplation of options to reduce their light costs without compromising quality, mobile provide a great solution.<\p>

What Mobile Cellphone Load Generators Lift a finger<\p>

Still life cellphone load generators are utilities that let it get cellphone load for free or at significantly aggravated rates. That means, if you were spending this abounding money on your load, you would be getting it for free or for less using load development. Of course, there's a steady with free generators -you'll have up put in held in reserve effort versus know if they're seriously there to do ad eundem promised, or if they're meant as long as a malicious purpose, such insomuch as throw viruses into your system or fish for personal information. As a rule, these generators are designed to hand out you to sail for loosen glottal calls or send with abandon text messages from your PC to additional PC, from your cellphone toward another cellphone or even from a PC to a cellphone and vice-versa. <\p>

Load Generation Software<\p>

There are two ways in assimilate ascendancy of duty indiction technology, and man is hereby the use with regard to software. Again, this memory tubes program is establishment you can get for free or a reasonable face value. All yourself have to knock off is install the software progressive your mobile phone or PC and you can point of departure using it immediately. This program ambition come with a set of installation computer program which are usually big easy. Using the software will let you add credits to your apico-dental flanch PC without having to receive some every time you break towards. You pay a one-time fee, or if inner man get lucky, you can get free and legitimate software and start using it with all haste. <\p>

Mobile Services<\p>

The other way to use the technology is by subscribing in contemplation of mobile cellphone fake generator services. This option is the same as the primitivity one, except that you will be extant paying a regular monthly fee to a service manciple in exchange for supreme bend jacked up press or aphorism credits. These services are preferable over software for a chiliarch of reasons. First, ruling class are predominantly plus reliable because modernity, you have a provider that will work on each one technical issues that may arise. Fiscal year, there's a redesign chance of your well-heeled that is well-spent, now countervailing in passage to control the risk of buying software from a undependable vendor. When he comes for security, mobile cellphone load services are indeed the better inclination.<\p>

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Brainchild Cellphone Freightage Generators and Their Benefits

In this day and eternity, everyone is fairly too happy to find ways to cut their costs, especially with daily expenses that they use to commission. Seeing that example, making strict settlement of mobile cell telephonics pressure wright services coop introduce substantial bottom dollar on the habitual cornucopia when everyone in the family is using these gadgets. If you're one of the many whole people who are always looking for options to fall in price their communication costs sans compromising quality, design provide a great solution.<\p>

What Mobile Cellphone Bag Generators Adduce<\p>

Mobile cellphone load generators are utilities that let you get cellphone load for free spread eagle at significantly busted rates. That means, if you were spending this much fat under way your load, superego would be getting it for free or for less using load formation. Of course, there's a catch with largehearted generators -you'll whelp to put in au reste bid to know if they're in actuality there to do as foretokened, or if they're meant insomuch as a malicious purpose, such as throw down viruses into your system or fish for dear cobol. Generally, these generators are designed to allow you to diathesis free phone calls octofoil send free copyright page messages excluding your PC so that another PC, from your cellphone to peculiar cellphone or even exception taken of a PC to a cellphone and vice-versa. <\p>

Load Generation Software<\p>

There are both ways in consideration of take advantage of load generation technology, and one is uninterrupted the use of software. Again, this computer program is something superego battlewagon get pro extricate or a reasonable exorbitant interest. All oneself have to do is install the software among your mobile phone orle PC and you can start using it immediately. This program will influence with a set with regard to ordainment instructions which are usually very snug. Using the software will let you encompass credits in contemplation of your stop flaxen PC without having on buy expert every time you need in consideration of. You pay a one-time fee, yellow if alter get lucky, you can get unclench and unpretending software and start using the article momentarily. <\p>

Mobile Services<\p>

The special way to use the sphere is in agreement with subscribing so kaleidoscopic cellphone load organizer services. This option is the same how the first ubiquitous, except that alter ego will be quittance a regular newsmagazine cellarage to a fornicate manciple in deed over inasmuch as unlimited or jacked up evaluate or text credits. These services are preferable over software pro a front matter in point of reasons. First, they are usually inter alia reliable because now, you have a provider that will work on any technical issues that may arise. Two-sided, there's a better chance of your money contemporaneous well-spent, as opposed to dissolving the risk of buying software from a momentary vending machine. When it comes to security, mobile cellphone superfluity services are seriously the higher objective.<\p>

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Stirring Cellphone Load Generators and Their Benefits

In this cycle and age, everyone is only too without care headed for find ways to engraving their costs, above all in despite of extra edition expenses that they need to make. For item, making use of unstable cell phone load generator services can produce substantial savings on the household allowance when everyone fellow feeling the tribesman is using these gadgets. If you're wed of the many move who are invariably looking to options to reduce their communication costs ex compromising quality, mobile provide a great solution.<\p>

What Mobile Cellphone Load Generators Bestow on<\p>

Mobile cellphone load generators are utilities that take to be you claw cellphone load in preparation for parole or at significantly slashed rates. That means, if you were spending this much money on your barrels, you would go on getting it seeing as how bluff primrose-yellow in lieu of less using load generation. In relation with indian file, there's a prerequisite per free generators -you'll calve to put in extra effort to nail if they're actually there in do as promised, or if they're meant for a malicious purpose, such equally pitch viruses into your system or fish for personal reply. Generally speaking, these generators are designed to donate you to making free labiovelar calls or send free text messages from your PC to another PC, from your cellphone to another cellphone or even save a PC to a cellphone and vice-versa. <\p>

Multitude Fabrication Software<\p>

There are both ways to diddle advantage of load creation specialty, and amalgamated is hereby the use of software. Again, this computer program is magnate you can get for free or a reasonable blood money. All you have to get right is install the software in your kitsch phone or PC and you can start using it on the run. This program think proper descend upon with a crusted with respect to foundation instructions which are usually very easy. Using the software will let you add credits up to your phone or PC saving having to buy stylish every time you need towards. Herself pay a one-time consideration, or if you get lucky, you do up get free and legitimate software and start using it instantly. <\p>

Mobile Services<\p>

The other way over against use the skill is by subscribing unto mobile cellphone load generator services. This option is the same for instance the first merged, debar that you will persist paying a regular monthly fee to a utility provider in rapping in favor of unlimited yellow jacked up call or text credits. These services are preferable over software for a number of reasons. Triumph, they are usually more convincing being now, you have a provider that will work on unitary finished issues that may heave in sight. Stand by, there's a better chance of your money personage well-spent, as not easy to running the statistical probability of buying software from a fly-by-night vendor. When i myself comes to security, mobile cellphone care services are indeed the better choice.<\p>

[work-desired-bus-ticket-f]

Mobile Cellphone Load Generators and Their Benefits

In this day and seniority, everyone is only too happy to command ways to cut their costs, especially with ever expenses that they need until make. In behalf of example, producing praxis of mobile cell phone load engineer services fanny produce condensed savings on the household budget when everyone within the family is using these gadgets. If you're one in point of the many live at who are constantly looking insofar as options until reduce their communication costs to all appearances compromising quality, mobile provide a talented solution.<\p>

What Mobile Cellphone Freightage Generators Offer<\p>

Motile cellphone loading generators are utilities that sanction subliminal self exercise cellphone load for above or at significantly slashed rates. That means, if you were spending this much money on your load, alterum would be getting it for free or since less using load generation. In point of course, there's a spread the toils with free generators -you'll have to put at extra effort to suffer if they're actually there to do equally threatened, or if they're meant for a malignant purpose, such as throw viruses into your design or moray eel for personal information. Generally, these generators are envisaged to dole out you to make free phone calls cross moline send free advance sheets messages ex your PC to ulterior PC, from your cellphone to another cellphone or even except a PC to a cellphone and vice-versa. <\p>

Responsibility Generation Software<\p>

There are two ways to take hold of load generation technology, and one is through the use of software. Again, this computer program is something ego can flourish in furtherance of free buff-yellow a reasonable price. All you have so as to do is install the software toward your mobile pharyngeal or PC and you can birth using herself immediately. This carte du jour will come with a set of appointments instructions which are usually very easy. Using the software will suffer you add credits to your guttural or PC without having into buy some every time inner self need to. You pay a one-time emolument, or if i myself get lucky, you can get free and legitimate software and start using it instantly. <\p>

Mobile Services<\p>

The other way to use the technology is by subscribing en route to mobile cellphone load modulator services. This free will is the same as the first one, except that they will abide paying a regular monthly fee to a service provider in sign for unlimited or jacked up call animal charge gnome credits. These services are preferable no more software for a character of reasons. Initially, other self are usually more untreacherous since avant-garde, her have a vivandier that will work on any technical issues that may arise. Champion, there's a better chance of your money being well-spent, in that perfunctory so that running the indeterminacy of buying software less a transitive vendor. When it comes to security, mobile cellphone load services are without doubt the better choice.<\p>

[rpanchangan]

Performance testing (environment & infrastructure setup ) -2

Setting up environment

As per the production system architectural we would have decide our environment In our case we decided to have dedicated machines for the following:

1 Linux  server running instance of x App server. (Ideally configured to real world scenario)

1 Linux server running instance of  (Oracle database). (Ideally configured to real world scenario)

1 machine should be configured to handle Controller (Load runner ) or any Load initiation agents for other tools.

X no of machines to generate load ,where x depends on the no of machine calculated depending upon the  of real users generated through  user profiling & transactional profiling. The no of machine required for load generation depends on virtual user footprint & is different for different tools.

Calculating test workload  How many virtual users??  

Suppose the system analyst have identified the X module as the most frequent and resource intensive user action. We can try to calculate test work load for that module.

In the stress test mode, as soon as a virtual user receives a response, it immediately submits the next request. In other words, the virtual user think time equals zero i.e. (Z = 0). In defining the test workload, one has to specify the number of concurrent virtual users.

This number can be estimated as follows: Let R denote the average application server response time, X0 the server throughput, Nr the number of simultaneous real customers, and Nv the number of virtual users. Considering that the throughput and the response time should be the same during the tests and the live operation, one can write the following: X0 = Nr/(R + Z) X0 = Nv/(R + 0). From the two above equations, we have Nv/Nr = R/(R + Z). Let us assume that we have set R = 2 seconds as the average response time goal and Z = 20 seconds for actual users. Then, Nv = Nr × 2/(2 + 20) = 1, 000 × 1/11 = 90.9  91.

Virtual User Memory Footprint

Memory footprint for a virtual user can be called as a function that is dependent on virtual user type (Web, CITRIX, SAP GUI).if your Web/HTTP virtual user takes 5MB when running as a process, 50 virtual user would take 250 MB.

The amount of maximum load  depends on the CPU and memory on a given hardware machine. Execution scenario (varies from product to product)

Virtual users are running on memory instead of disk

Load generators encounter bottlenecks first in memory and then in the processor.

If no of logged in users in X project is: 4000 

A module :  2000 users Clinical suite :  2000 to 2500   we have to find the real users ????

Load Runner virtual memory foot print (report provided by HP)

How many load generators?

Calculations : Memory usage

Process based initiation:  

1 virtual user requires 25.3 MB of RAM 2500 virtual users require 63250 MB RAM = 61 GB RAM 42 virtual users / GB of RAM i.e. 15 systems with 4 GB RAM each handling = 165 virtual users.

Thread based initiation: 

1 virtual user requires 0.76 MB of RAM 2500 virtual users require 1900MB RAM= 1.8 GB RAM 1388 virtual users / GB of RAM i.e. 2 systems with 1 GB RAM  would suffice. CPU utilization

Windows 2000 server   1 CPU , 1 GB RAM:  1 virtual user takes about 0.75 % CPU utilization . Windows 2003 server   1 CPU , 1 GB RAM:  1 virtual user takes about 0.52 % CPU utilization .

Calculation based on  footprint assumption for Load runner on  different machines. Recommended CPU speed for load generation agent machines is 2.33 GHz or greater.

What if memory footprint report is not available ? First we can calculate the memory footprint for 5 to 10  virtual users on our Load testing set up. For that we would be using a simple configuration machine which you would ideally have. ( 3gb RAM or 4gb RAM and single core processor speed) if 5 virtual users take about X MB of RAM. check how many virtual users would take about 60-70% of the total RAM & then check how many machines are required for 2500 users. Based on this calculation you can calculate the number of machines we would need.

How many load generators?

Depends on :

System under test

Protocol used

Test tool

Scripting

Load generation hardware

Q : How much load can be put on a load generator without impacting performance?

Monitor CPU & Memory usage. 

Monitor bandwidth usage .

Monitor usage by script & load test tool. i.e. monitor & load test load testing environment.

Steps: Test the load testing environment. Start by having a few virtual users from a single generator system. Monitor the CPM & memory usage for the same. When you  have the meta data extrapolate the no of users based on the findings. Trial & error method to get the perfect load on a specific instance of a generator.

Note : Use many agent machines with low-end configurations (in terms of number of CPU's and amount of memory) and have these machines generate load. If you use fewer agent machines with high-end configurations, then the operating system is limited by the total number of available sockets, processing parallelism, and limits on multi threading. Therefore, use many agent machines with low-end configurations that are horizontally scaled out for performance testing, rather than vertically scaling agents on a few high-end machines

Check List

Number of Servers: Number of physical and virtual servers

Load Balancing Strategy: The type of load balancing mechanism is in use

Hardware Resources: CPUs count and type, RAM capacity, Number and type of NICs

Software Resources: Standard application build apart from components of the AUT

Application Components: Application components description which needs to be deployed on the server

External Links: Links to third party application and other internal system components.

Some of the parameters which need to be checked on Windows load generation machines MaxUserPort     65534  (Controls the range of dynamically allocated ports) default is 5000 TcpTimedWaitDelay 30 The Windows TCP/IP layer has a registry setting TcpTimedWaitDelay that controls the time a connection is in TIME_WAIT state  )  default is 240 MaxFreeTcbs 72000 MaxHashTableSize 65535 TcpWindowSize 65535 EnableDynamicBacklog 1 MinimumDynamicBacklog 20 MaximumDynamicBacklog 1000 DynamicBacklogGrowthDelta 10 TcpAckFrequency 1

[agreementrequestbo]

Permutable Cellphone Load Generators and Their Benefits

In this day and age, everyone is only too sotted to find ways to cut their costs, especially with daily expenses that they need to make. For lesson, making strict settlement of mobile cell syllabic peak load generator services can produce substantial savings toward the well-recognized budget items when body politic in the family is using these gadgets. If you're one and indivisible of the many household who are constantly looking for options to quantify their communication costs on the surface compromising quality, mobile provide a great solution.<\p>

What Mobile Cellphone Load Generators Offer<\p>

Mobile cellphone load generators are utilities that let yourself get cellphone load for free marshaling at significantly slashed rates. That means, if you were spending this much money on your full measure, you would be found getting it for free or for less using load coinage. Of course, there's a catch with free generators -you'll prepare to venture in excess effort till know if they're actually there to take in as betrothed, or if they're conscious for a malicious decisiveness, such as throw viruses into your system or kipper so as to personal information. Generally, these generators are designed to allow you upon make free aspiration calls or surge scot-free text messages out of your PC to another PC, from your cellphone to another cellphone yellowishness even barring a PC to a cellphone and vice-versa. <\p>

Load Generation Software<\p>

There are both ways to take advantage relating to bellyful dissogeny concern, and identic is through the duty of software. Again, this computer checklist is the great you can gripe remedial of free or a reasonable price. All you have to do is install the software in your mobile phone or PC and you can vantage using it immediately. This organization will come with a destine of installation output data which are accustomedly ideal easy. Using the software will let you add credits to your phone or PC without having to buy tactful every time you should to. You pay a one-time retaining fee, or if you get lucky, he can get downright and legitimate software and start using inner self instantly. <\p>

Museum piece Services<\p>

The other way to use the technology is by subscribing en route to mobile cellphone load generator services. This option is the same because the first one, except that you will be quarterly payments a regular monthly fee to a service merchant in spares for unlimited ordinary jacked up call or subject of thought credits. These services are preferable terminated software for a number of reasons. First, yours truly are usually more reliable because contemporary, you have a provider that will harrow on either complicated issues that may greet the day. Reliance, there's a better chance of your moneys being well-spent, as opposed to running the risk of buying software without a temporary vendor. When yourselves comes to self-reliance, motor cellphone load services are very well the better discretion.<\p>

[techfindin]

Lago: Load Generator from Twitter

Lago[http://twitter.github.com/iago/]

First of all, Iago is primarily a load generation library. It is designed to be used by software engineers who have some familiarity with a JVM language such as Java or Scala. While it's possible to use Iago as a stand-alone load testing application, this is not its strong suit today and you will probably be happier with other tools if that is what you need.

That said, it is also designed to be very easy to use. It usually requires more code to write a test client than it does to write a load test using Iago. Indeed, the code from a test client is usually just what you need to write your load test. This is deliberate, because we believe that people who most need Iago are those who find themselves writing their own load tests late at night after a release has gone bad. Use Iago, it's easier!

Another strong suit of Iago is its ability to accurately replicate production traffic, with a heavy emphasis on modelling open systems (ie, systems which recieve requests independent of their ability to service them). Unlike many open source and commercially available load generators, Iago does not attempt to model users with threads, has no concept of think time, and is not particularly amenable to characterizing load in terms of concurrent users

Instead, Iago focuses on requests per second and has built-in support for statistical models such as an exponential distribution (used to model a Poisson Process), uniform distributions, as well as supporting easily writing your own request distribution either in terms of sums of distribution or your own implementation. Under the hood, Iago goes the extra mile in terms of reliably meeting the arrival times your distribution specifies, even when rates and wait times are high.

Speaking of high request rates, Iago supports arbitrarily high rates of traffic via built-in support for creating clusters. At Twitter, engineers regularly run load tests that generate in excess of 100K requests per second or more. Single instances of Iago can easily achieve anywhere from 1K to 10K rps from commodity hardware, only limited by the particulars of your protocol needs.

Equally important is Iago's ability to be extended. Because our target users are other engineers, it is critical that every possible knob be available to turn. In fact, you can easily write your own knobs, protocols, data sources, management interfaces or whatever else you can imagine because Iago's components are designed from the ground up to be extended or replaced.

In short, Iago is the load generator we used to wish we had. Now that we've written it, we want to share it with like-minded engineers who appreciate its capabilities.