Hardware fails, applications fail, our code... well, it fails too (at least mine). To prevent software failure we test. Hardware failures are inevitable, so we write code that tolerates them, then we test. From tests we gather metrics and act upon them by improving parts that perform inadequately. Measuring right things at right places in an application is as much about good engineering practices and maintaining SLAs as it is about end user experience and may differentiate successful product from a failure.
In order to act on performance metrics such as max latency and consistent response times we need to know their accurate value. The problem with such metrics is that when using popular tools we get results that are not only inaccurate but also too optimistic.
During my presentation I will simulate services that require monitoring and show how gathered metrics differ from real numbers. All this while using what currently seems to be most popular metric pipeline - Graphite together with metrics.dropwizard.io library - and get completely false results. We will learn to tune it and get much better accuracy. We will use JMeter to measure latency and observe how falsely reassuring the results are. Finally I will show how HdrHistogram helps in gathering reliable metrics. We will also run tests measuring performance of different metric classes.
Hardware fails, applications fail, our code... well, it fails too (at least mine). To prevent software failure we test. Hardware failures are inevitable, so we write code that tolerates them, then we test. From tests we gather metrics and act upon them by improving parts that perform inadequately. Measuring right things at right places in an application is as much about good engineering practices and maintaining SLAs as it is about end user experience and may differentiate successful product from a failure.
In order to act on performance metrics such as max latency and consistent response times we need to know their accurate value. The problem with such metrics is that when using popular tools we get results that are not only inaccurate but also too optimistic.
During my presentation I will simulate services that require monitoring and show how gathered metrics differ from real numbers. All this while using what currently seems to be most popular metric pipeline - Graphite together with metrics.dropwizard.io library - and get completely false results. We will learn to tune it and get much better accuracy. We will use JMeter to measure latency and observe how falsely reassuring the results are. Finally I will show how HdrHistogram helps in gathering reliable metrics. We will also run tests measuring performance of different metric classes.
LinkedIn is more than just a networking site for job searches. The popular social media site is also a source for prospecting for qualified leads. Learn how in this e-book from LyntonWeb.
Time Travel Hotel by Clive Birnie - SampleBurning Eye
Black McCarthy is despatched to INTERFOLD – The Time Travel Hotel Republic to track down “Eugenides”. His client, the Wolf, is on his back demanding progress as INTERFOLD keeps shifting time and place, throwing up residency and immigration anomalies as it does so. Help of a kind is on hand via the Dwarf with the Horse, the Man Who Fell Through Floors, the Girl With Nine Lives, the Nurse With The Curse, and Joylin – the INTERFOLD receptionist. But who is Eugenides? The ManWho Lived in a Vacuum Cleaner? The Man Who Dreamt He Was Dreaming? One of the other oddball residents? Is winding up naked in a sauna elevator in the Car Park at Infinity really going to help track him down? Unfortunately for Black, his client is not the only one who wants Eugenides found, Black is possibly the worst detective money can buy and time is not only against him but ignoring all the usual rules. Beneath the black humour, Time Travel Hotel is an exploration of identity and whether we are defined by a place of origin, residence, citizenship or by the decisions that propel us through life. It is a book about regret and missed opportunities. A book about going back – if only you could.
Vi forsøger her at få helikopterblikket på nogle tendenser, som vi for øjeblikket ser inden for sociale medier. De 5 trends er:
1. In-house kompetencer
2. Content Strategy
3. Social shopping & Lokation
4. Influencer
5. Social Gaming
6. Ekstra: Augmenter reality
5 social media mega trends.
LinkedIn is more than just a networking site for job searches. The popular social media site is also a source for prospecting for qualified leads. Learn how in this e-book from LyntonWeb.
Time Travel Hotel by Clive Birnie - SampleBurning Eye
Black McCarthy is despatched to INTERFOLD – The Time Travel Hotel Republic to track down “Eugenides”. His client, the Wolf, is on his back demanding progress as INTERFOLD keeps shifting time and place, throwing up residency and immigration anomalies as it does so. Help of a kind is on hand via the Dwarf with the Horse, the Man Who Fell Through Floors, the Girl With Nine Lives, the Nurse With The Curse, and Joylin – the INTERFOLD receptionist. But who is Eugenides? The ManWho Lived in a Vacuum Cleaner? The Man Who Dreamt He Was Dreaming? One of the other oddball residents? Is winding up naked in a sauna elevator in the Car Park at Infinity really going to help track him down? Unfortunately for Black, his client is not the only one who wants Eugenides found, Black is possibly the worst detective money can buy and time is not only against him but ignoring all the usual rules. Beneath the black humour, Time Travel Hotel is an exploration of identity and whether we are defined by a place of origin, residence, citizenship or by the decisions that propel us through life. It is a book about regret and missed opportunities. A book about going back – if only you could.
Vi forsøger her at få helikopterblikket på nogle tendenser, som vi for øjeblikket ser inden for sociale medier. De 5 trends er:
1. In-house kompetencer
2. Content Strategy
3. Social shopping & Lokation
4. Influencer
5. Social Gaming
6. Ekstra: Augmenter reality
5 social media mega trends.
Social media @Billund Airport by Henrik Meisel - Community Manager Billund L...Henrik Meisel
Skal din virksomhed på sociale medier? Hvordan får jeg min virksomhed i gang på sociale medier? Hvad er værdien ved at være på sociale medier for min virksomhed?
Social media @Billund Airport by Henrik Meisel - Community Manager Billund Lufthavn
Oplæg om sociale platforme i det offentlige, herunder social business tanker og kollboration.
Indhold:
Digitalt øjebliksbillede
1. Skab en platform, som alle kan bygge videre på
2. Styrk relationer og netværk
3. Arbejd med nye digitale redskaber
4. Vær mere eksplorativ
Afrunding