Spying on the floating point behavior of existing, unmodified scientific applications

Spying on the floating point behavior of existing, unmodified scientific applications Dinda et al., HPDC’20

It’s common knowledge that the IEEE standard floating point number representations used in modern computers have their quirks, for example not being able to accurately represent numbers such as 1/3, or 0.1. The wikipedia page on floating point numbers describes a number of related accuracy problems including the difficulty of testing for equality. In day-to-day usage, beyond judicious use of ‘within’ for equality testing, I suspect most of us ignore the potential difficulties of floating point arithmetic even if we shouldn’t. You’d like to think that scientific computing applications which heavily depend on floating point operations would do better than that, but the results in today’s paper choice give us reason to doubt.

…despite a superficial similarity, floating point arithmetic is not real number arithmetic, and the intuitive framework one might carry forward from real number arithmetic rarely applies. Furthermore, as hardware and compiler optimisations rapidly evolve, it is challenging even for a knowledgeable developer to keep up. In short, floating point and its implementations present sharp edges for its user, and the edges are getting sharper… recent research has determined that the Continue reading

A letter from Cloudflare’s founders (2020)

A letter from Cloudflare’s founders (2020)

To our stakeholders:

Cloudflare launched on September 27, 2010 — 10 years ago today. Stopping to look back over the last 10 years is challenging in some ways because so much of who we are has changed radically. A decade ago when we launched we had a few thousand websites using us, our tiny office was above a nail salon in Palo Alto, our team could be counted on less than two hands, and our data center locations on one hand.

A letter from Cloudflare’s founders (2020)
Outside our first office in Palo Alto in 2010. Photo by Ray Rothrock.

As the company grew, it would have been easy to stick with accelerating and protecting developers and small business websites and not see the broader picture. But, as this year has shown with crystal clarity, we all depend on the Internet for many aspects of our lives: for access to public information and services, to getting work done, for staying in touch with friends and loved ones, and, increasingly, for educating our children, ordering groceries, learning the latest dance moves, and so many other things. The Internet underpins much of what we do every day, and Cloudflare’s mission to help build a better Internet seems more Continue reading

Welcome to Birthday Week 2020

Welcome to Birthday Week 2020

Each year we celebrate our launch on September 27, 2010 with a week of product announcements. We call this Birthday Week, but rather than receiving gifts, we give them away. This year is no different, except that it is… Cloudflare is 10 years old.

Before looking forward to the coming week, let’s take a look back at announcements from previous Birthday Weeks.

Welcome to Birthday Week 2020

A year into Cloudflare’s life (in 2011) we launched automatic support for IPv6. This was the first of a long line of announcements that support our goal of making available to everyone the latest technologies. If you’ve been following Cloudflare’s growth you’ll know those include SPDY/HTTP/2, TLS 1.3, QUIC/HTTP/3, DoH and DoT, WebP, … At two years old we celebrated with a timeline of our first two years and the fact that we’d reached 500,000 domains using the service. A year later that number had tripled.

Welcome to Birthday Week 2020

In 2014 we released Universal SSL and gave all our customers SSL certificates. In one go we massively increased the size of the encrypted web and made it free and simple to go from http:// to https://. Other HTTPS related features we’ve Continue reading

New ACI deployment? Watch out when connecting APICs to Leafs

It’s one of those articles aimed at the people with Cisco ACI experience who don’t bother with reading all the install and other guides again while going through n’th time of building and ACI fabric, like me. When it comes to Cisco ACI, you really should. There’s a small change with the physical build of the third generation of APIC server where 10G SFP interfaces from APIC towards the Leaf switches (used for fabric discovery and later for the in-band controller to fabric communication) where 4x10G card is built in the server and not like 2x10G on M2/L2 and other

The post New ACI deployment? Watch out when connecting APICs to Leafs appeared first on How Does Internet Work.

Configure NXOS with Napalm

Napalm offers an easy way to configure and gather information from network devices using a unified API. No matter what vendor it is used against the input task and returned output will be the same. The only thing that will not be vendor neutral is the actual commands run and configuration being applied. This post documents experiences of trying to replace the whole configuration on NXOS using Napalm with Ansible.

Aws Deeplens – meet the devil dog – part 1

Now on first look she is so adorable, don’t be fooled by looks this dog is responsible for destruction of usb cables, foot wear , headphones, trash can openings and garden destruction.

Idea inspired from : https://youtu.be/ALKz1eKj4n0

Aws deeplens – https://aws.amazon.com/deeplens/

So here is the idea, over the course of next few days to months, I will start capturing many constructive and destructive images of my dog and start training a AI model which will give us a reasonable idea on what exactly she is up to when we leave her alone and alert us accordingly.

Am not a ML developer let alone be an expert, but aws makes it easy to train and deploy models and you don’t have to know much to get started. I developed another ML model with aws rekognition which identifies unwanted plants and shrubs in a raised bed.

I got set up this deeplens and deployed a model project in no less than 5 minutes and am being honest. Here is a sample model which identifies cat vs dog , this model comes is among example models.

It has a Mqtt topic which you can subscribe as well

-Rakesh

Worth Reading: Iron Chef – Certification Edition

In one of his recent blog posts Tom Hollingsworth described what I semi-consciously felt about the CCIE lab exam for at least 25 years: it’s full of contrived scenarios that look more like Iron Chef than real life.

I understand they had to make the lab harder and harder to stop cheating (because talking with candidates and flunking the incompetents is obviously not an option), and there’s only so much one can do with a limited set of technologies… but forcing networking engineers to find ever-more-devious ways to solve overly-complex problems is nothing else but fuel for rampant MacGyverism.

Anyway, I don’t think this mess will ever be fixed, so the only thing we can do is to enjoy the rant.

Weekend Reads 092520

Cybercrime rewards innovative organizations. These can innovate at the tactical level (e.g. new or updated tactics, techniques, and procedures (TTP)), the strategic level (e.g. new monetisation methods), or at the operational level—the management of resources and personnel to achieve strategic objectives. This is operational art.

Enterprises cannot afford to ignore the threat posed by encrypted inbound network traffic. Adversaries now commonly use encrypted traffic flows to cloak cyberattacks, slipping malware, ransomware, and other malicious content past perimeter detection systems.

Major cloud services providers are about half as likely (46%) to experience a data breach compared with large enterprises, a new study suggests.

In short: The Trolley Problem is not the kind of a problem that is open to a solution. The Trolley Problem is not for solving, it’s for teaching—for stimulating, for illustrating, for provoking, for exposing predilections and contradictions. It’s a thought experiment. (Philosophy also performs thought experiments with zombies.) The point is not to work out the answer to a riddle; the point is to think about the implications of the circumstances. We open Pandora’s Box, but we don’t intend to catch the demons and stuff them back in; we let them fly around wreaking Continue reading

Government cybersecurity agency warns of Windows Server exploit

The federal government's Cybersecurity and Infrastructure Security Agency (CISA) has issued a rare emergency directive to federal government agencies to roll out a Windows Server patch within days, an indication of the severity of the exploit.The directive was issued on September 18, and agencies were given four days to apply the security update. It demands that executive agencies take "immediate and emergency action" to patch CVE-2020-1472, issued August 11.The vulnerability is in Microsoft Windows Netlogon Remote Protocol (MS-NRPC), a core authentication component of Active Directory from Windows Server 2008 to Server 2019. It has been named "Zerologon" because of how it works.To read this article in full, please click here

Government cybersecurity agency warns of Windows Server exploit

The federal government's Cybersecurity and Infrastructure Security Agency (CISA) has issued a rare emergency directive to federal government agencies to roll out a Windows Server patch within days, an indication of the severity of the exploit.The directive was issued on September 18, and agencies were given four days to apply the security update. It demands that executive agencies take "immediate and emergency action" to patch CVE-2020-1472, issued August 11.The vulnerability is in Microsoft Windows Netlogon Remote Protocol (MS-NRPC), a core authentication component of Active Directory from Windows Server 2008 to Server 2019. It has been named "Zerologon" because of how it works.To read this article in full, please click here

What Does Normal Look Like Now? COVID’s Impact on the Internet

Six months ago, when the World Health Organization declared COVID-19 a pandemic, it accelerated the shift out of offices and schools and onto the Internet. Back then, we asked if the Internet was resilient enough to withstand Coronavirus. After several months of observations, we confirmed that it is, thanks to the strength, resilience and success of the open architecture that underpins it. Since then, concerns about the Internet’s ability to handle the increase in lockdown-driven traffic seem to have abated, resulting in fewer articles and blog posts on the topic.

Getting Back to Normal

As we head into the final months of 2020, some businesses have reopened in a limited capacity, allowing employees to return to their brick-and-mortar workplaces. Many students are also returning to school, whether in person or online. Yet, the lack of affordable and available Internet access remains a significant issue. Earlier this year, we heard stories about students sitting outside schools and libraries in search of reliable WiFi in order to attend classes. As the new school year starts in North America, we heard about students using WiFi signals from a local fast food chain restaurant to complete their homework. And with students now needing to Continue reading

TAYGA: Bridge an IPv6 Network Back to IPv4 using NAT64

Every network admin on the planet knows this dirty little secret: We’re running out of IPv4 addresses. This was an inevitability, given how wide-spread the network and network devices have become. Even on your LAN, you sometimes have to use subnetting, simply because you’ve found the devices on your massive enterprise network have gobbled up all the 192.68.1.x addresses. It’s a problem. Which is why IPv6 was developed. IPv6 offers a larger pool of addresses from which to use. The problem is that IPv6 isn’t nearly as easy to employ as IPv4. After all, 192.168.1.1 is much easier to remember than 0:0:0:0:0:ffff:c0a8:101. But what’s a network administrator to do? Migrate all of those servers and various hardware devices from IPv4 to IPv6? In theory, yes, that is exactly what should happen. However, that’s not nearly as easy as one would like to think it would be. After all, you might have hundreds upon hundreds of devices and numerous locations. On top of which, there’s always that pesky DNS that must be updated (which could equate to downtime). Oh, and let’s not forget that IPv6 is not backward compatible with IPv4. Why was this decision Continue reading

Cisco turns out security patches 25 high-threat flaws for IOS, IOS XE

If you are a security admin with lots of systems running Cisco IOS and IOS XE software today is decidedly not your day.Cisco this week posted 25 “High” rated security advisories that stem from 34 vulnerabilities the company suggests should be fixed as soon as possible. The vulnerabilities impact a wide-range of Cisco gear as IOS and IOS XE are the company’s most widely used operating systems. The warnings affect firewalls, wireless access points and switches.Network pros react to new Cisco certification curriculum For example, one of the highest rated threats--with an 8.6 out of 10 threat level, are multiple vulnerabilities in the Zone-Based Firewall feature of Cisco IOS XE Software that could let an remote attacker to cause the device to reload or stop forwarding traffic through the firewall,resulting in a denial of service (DoS).To read this article in full, please click here

Cisco turns out security patches 25 high-threat flaws for IOS, IOS XE

If you are a security admin with lots of systems running Cisco IOS and IOS XE software today is decidedly not your day.Cisco this week posted 25 “High” rated security advisories that stem from 34 vulnerabilities the company suggests should be fixed as soon as possible. The vulnerabilities impact a wide-range of Cisco gear as IOS and IOS XE are the company’s most widely used operating systems. The warnings affect firewalls, wireless access points and switches.Network pros react to new Cisco certification curriculum For example, one of the highest rated threats--with an 8.6 out of 10 threat level, are multiple vulnerabilities in the Zone-Based Firewall feature of Cisco IOS XE Software that could let an remote attacker to cause the device to reload or stop forwarding traffic through the firewall,resulting in a denial of service (DoS).To read this article in full, please click here

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