Using Apache Bench for Simple Load Testing #ab #load #testing


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Using Apache Bench for Simple Load Testing

If you have access to a Mac or Linux server, chances are you may already have a really simple http load generating tool installed called Apache Bench, or ab. If you are on windows and have Apache installed, you may also have ab.exe in your apache/bin folder.

Suppose we want to see how fast Yahoo can handle 100 requests, with a maximum of 10 requests running concurrently:

It will then generate output as follows:

As you can see this is very useful information, it returned requests at a rate of 52.94 requests per second, the fastest request was 175ms, the slowest 224ms

So the next time you are tempted to whip out cfloop and GetTickCount to do some benchmarking on a piece of code, give ab a try, it’s easy to use, and will yield much more realistic results.

Because ab supports concurrency, this has two big advantages over cfloop. The main one is that it allows you to test how your code runs concurrently, this can help you identify any possible race conditions, or locking issues. Concurrent requests are also a more natural simulation of load than loops.

Suppose you wanted to test multiple url’s concurrently as well? You can do this by creating a shell script, with multiple ab calls. At the end of each line place an this makes the command run in the background, and lets the next command start execution. You will also want to redirect the output to a file for each url using filename For example:

The usage info from the ab version installed on my Mac (v2.3) is listed below. As you can see there are many useful options for outputting results, and sending additional data in the request.

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Pete, I like your suggestion, by your method is completely incorrect. First, benchmarking Yahoo.com is useless for detecting their performance, as there are too many other variables to take into account. Second, your scripts will not gather correct result for two reasons: 1). You are benchmarking localhost, that will spike the load on the box, making the performance less accurate. and 2). You are running multiple benchmarks concurrently, which will also skew your results. You should always run your benchmarks from another machine, and run one at a time to isolate performance, all you’re doing right now it wasting electricity and getting useless results.

by Jacob Torrey on 02/05/2009 at 4:00:15 PM UTC

by Pete Freitag on 02/06/2009 at 8:40:05 AM UTC

hello pete, while i was trying to use the ab cmd,i could not get my ip addr either by ipconfig or /sbin/ifconfig -a the problem is i get different ip addr’s. how should i check the performance?

by varsee on 06/21/2009 at 8:32:37 PM UTC


15/10/2017

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EBM for Orthopedic Implants – Additive Manufacturing #ab #production


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CAD to Metal®Arcam AB®

EBM ® for Orthopedic Implants

– quality of life built with Additive Manufacturing

Worldwide we see a growing and aging population that leads a more active lifestyle. These demographic changes together with a constant development of new surgical techniques and new products are driving a steady growth of the orthopedic implant market. At the same time increasing competition and eroding margins push the orthopedic implant manufacturers to focus more on product differentiation and cost reduction.

Since many years the EBM technology is used for production of standard as well as custom orthopedic implants. The Arcam EBM technology allows implant industries to manufacture innovative products and at the same time reduce production costs and lead times.

Standard implants

The EBM technology is a cost-efficient production process for both press-fit and cemented implants. It is particularly cost-efficient for volume production of press-fit implants with advanced Trabecular Structures™. Solid and porous sections of the implant are built in the same process step, eliminating the need to apply for example plasma sprayed porous materials through expensive secondary processes.

Custom implants

The EBM technology offers a direct CAD to Metal process that allows production of patient-specific implants using data derived from Computer Tomography (CT ). The CT data is used to create an exact CAD model of the desired implant. This model is then used by the EBM machine to build the actual part.

Trabecular Structures

Develop and manufacture your own unique Trabecular Structures using the EBM technology. The EBM process opens up a completely new possibility to tailor and optimize your trabecular structure design – your trademark porous ”coating”.

Freedom in design is a powerful tool for Product Differentiation .

EBM Trabecular Structures may be optimized for improved primary fit and osseointegration by allowing you to tailor:

  • Pore geometry
  • Pore size
  • Relative density
  • Roughness

EBM in production

The Arcam EBM process is a cost-efficient and robust manufacturing technology for a wide range of implant types. There are a growing number of CE-certified and FDA-cleared implants produced with the Arcam EBM technology on the market.

Arcam AB, Headquarters

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06/10/2017

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Barrhead Travel Guide: Barrhead, Alberta (AB) #travel #credit #cards

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01/08/2017

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Highest Tax Saving Bank Fixed Deposit Rates 80C – May 2017


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Highest Tax Saving Bank Fixed Deposit Rates U/S 80C May 2017

Highest Tax Saving Bank Fixed Deposit Rates 80C May 2017

Tax Saving Fixed Deposits one of the most popular way to save taxes u/s 80C of income tax. These are like normal Fixed Deposit with banks but is labeled as “Tax Saving FD” while making the deposit.

Why you Should Invest?

  1. Convenient to invest. ICICI Bank, SBI, HDFC Bank, etc offers online facility for Tax Saving FD
  2. Redemption on maturity comes directly to your bank account
  3. High Safety FD up to Rs 1 Lakh is insured

Why you Should Not Invest?

  1. There are lot of competing products like EPF, PPF, ELSS to exaust the investment of Rs 1.5 Lakh u/s 80C
  2. The interest earned is taxable
  3. Cannot be withdrawn prematurely
  4. Cannot be pledged to secure loan or as security

Tax Saving Fixed Deposit Interest Rate

Bandhan Bank and Bank of India have reduced their interest rates (compared to last month) on tax Saving FDs.

Also State Bank of Bikaner and Jaipur, State Bank of Hyderabad, State Bank of Mysore, State Bank of Patiala and State Bank of Travancore have merged with State Bank of India effective April 1, 2017.

As of May 1, 2017 banks are offering 6.00% 7.50% for general public and 7.00% 8.00% for Senior Citizens.

  1. The best Tax Saving Fixed Deposit Interest offered is 7.50% for General Public byThe Ratnakar Bank
  2. The best Senior citizens Tax Saving Fixed Deposit Interest offered is 8.00% by The Ratnakar Bank

The table below lists the banks in alphabetical order with their respective interest rate offer on Tax Saving FDs for General and Senior Citizens.

The highest Interest Rates have been highlighted :

Taxation TDS Tax Saving Fixed Deposits:

The interest received on tax Saving Fixed Deposit is fully taxable. The interest income is considered as income from other sources for Tax filing and taxed at marginal tax rates applicable.

TDS would be deducted at the rate of 10% of the interest paid, if the interest paid exceeds Rs 10,000 in a financial year. You can see the same in Form 26AS .

In case your income does not exceed taxable slab and so want to avoid TDS, you can submit Form 15G or 15H when making the deposit. You would also need to submit the form at the start of every financial year to the concerned bank branch.

Key Points – Tax Saving FD:

Below are some of points to keep in mind while investing in Tax Saving Deposits:

  1. As the Tax Saving FD scheme was introduced in Budget of 2006, it s also known as Tax Saving Deposit scheme 2006 (Notification Number 203/2006 and SO1220 (E) dated 28/07/2006)
  2. Most of the banks accept deposit of 5 Years only. However there are banks with deposit tenures of more than 5 Years
  3. You can deposit on either Single or Joint name. However benefit of tax deduction is available for first holder only.
  4. Most banks offer interest rate which is similar to their 5 years term deposits. Only a few banks give slightly higher interest rate for their Tax Saving Fixed Deposits
  5. Most banks give Senior citizens and their staff members additional interest of 0.25% to 0.5%
  6. Depositor can opt for either cumulative or non-cumulative way of crediting periodical interest
  7. Don’t be mislead by banks advertisements about their yield on Tax Saving FDs. Those are manipulative calculations
  8. Be cautious of small co-operative banks as they have higher risk than bigger private and public sector banks
  9. Depositor gets benefit U/s.80C of the Income Tax Act. 1961
  10. Minimum deposit is Rs.100 and in multiples thereof
  11. Maximum deposit in a Financial Year Rs.1,50,000/- [i.e. 1st April to 31st March of the following calendar year]
  12. Deposits cannot be withdrawn prematurely
  13. Deposits cannot be pledged to secure loan or as security

Disclaimer:We have tried to keep interest rates up to date, but as these change frequently you are advised to check with the bank before investing. Also it would be great if you can point out any errors through comments or email!

Direct link for Interest Rates on FDs of Banks:

Below is the direct link for Interest Rates of Major Banks. You might want to check the interest rates before doing your FD.


10/07/2017

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Barrhead Travel Guide: Barrhead, Alberta (AB) #airline #travel #tickets

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11/06/2017

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Barrhead Travel Guide: Barrhead, Alberta (AB) #hotels #cheap

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13/02/2017

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