High Scalability - Comments

Charl comments on Stuff The Internet Says On Scalability For May 24, 2013

Charl — Fri, 24 May 2013 20:37:47 +0000

When I follow the link about 100 million hours of uploads per minute on youtube, the article says only 100 hours per minute. Still very impressive, but a massive difference...

Uli comments on Stuff The Internet Says On Scalability For May 24, 2013

Uli — Fri, 24 May 2013 18:50:56 +0000

I think it is "just" 100 Hours uploaded on Youtube each minute :) Still crazy ;)

Best Regards,
Uli

Lawrence Kesteloot comments on Stuff The Internet Says On Scalability For May 24, 2013

Lawrence Kesteloot — Fri, 24 May 2013 18:12:00 +0000

That's 100 hours, not 100 million hours (YouTube). What does it say that I originally believed the numbers?!

vdp comments on Stuff The Internet Says On Scalability For May 24, 2013

vdp — Fri, 24 May 2013 16:05:30 +0000

s/100 million hours/100 hours/

Jason Gordon comments on The Tumblr Architecture Yahoo Bought for a Cool Billion Dollars

Jason Gordon — Fri, 24 May 2013 15:06:13 +0000

Just want to say thank you to Blake and Todd for taking the time to deliver this article. I got some validation out of the tumblr interviewing process. I believe irrelevant brain teaser gauntlets can intimidate and discourage potentially solid developers. Good to know other people doing real work think that way too!

DB comments on Strategy: Stop Using Linked-Lists

DB — Thu, 23 May 2013 17:57:37 +0000

It's funny that there's so many people butthurt over the suggestion that Linked Lists aren't performant. Probably because none of them have ever designed a system at scale.

Age and pimple (or pimple free) has nothing to do with how good the idea is, and in this case, the author is correct.

LInked lists have a ton of pointers, and a ton of them are bad for the branching lookahead units. ArrayLists are always in contiguous memory, and pay an amortized growth penalty.

It's not hard to code up an example that thrashes both array types from multiple threads on multiple cores. Spend the 5 minutes and look for yourself.

Isuru comments on Start Here

Isuru — Thu, 23 May 2013 12:21:11 +0000

Almost 3 years of experienced Software guy here. But I'm fairly new to all things web but I've always been amazed and intrigued by how huge sites operate and everything. Although I don't understand (yet) half of the information in these articles, I love reading them. Hopefully one day, I'll be able to make my own contributions as well.

JB comments on Strategy: Stop Using Linked-Lists

JB — Thu, 23 May 2013 12:19:07 +0000

It's good advice that many people don't seem to have yet got and is worth repeating.
There are few situations where the performance of linked lists is better than a simple vector. Even the ones that it's supposed to be good for like inserting at the start a vector will often outperform a list.

The main time I use them is when I have to splice together multiple lists quickly. It still seems to have some advantage there,.

Andreas comments on Grace Hopper to Programmers: Mind Your Nanoseconds!

Andreas — Thu, 23 May 2013 11:22:29 +0000

|Please correct this sentence:
|"... a nanosecond, a billionth of a second, which was the speed of their new computer circuits."
|
|(because, of course, the nanosecond is a unit of time not speed)

Why? "one billionth of a second" equals 1 GHz, which is the clock speed of (still some) CPUs

Vomitorium comments on Strategy: Stop Using Linked-Lists

Vomitorium — Thu, 23 May 2013 10:08:12 +0000

OK, interesting, didn even thought about that.
But, all modern frameworks & APIs (and yes, IDEs) and laguages make it *fairly* easy to use linked-lists, because all functions are returing usually some type of linked list :-(