Top Tweets for #WeekendDevPuzzle

@championswimmer

over 2 years ago

Had been missing the very gripping #WeekendDevPuzzle series that @amodm had started last year. Thought I will try to make a few myself. Here's one 👇 if you'd like :)

@championswimmer

over 2 years ago

Let's have some fun with concurrency. Here is some example Go code Basically just calculates the time taken to run a loop and prints it. To slow down the loop, I calculate the time after every 10000 iterations, and in every iteration I divide two random numbers. And this is what the output looks like. About ~150us per printed everytime I calculate. When this runs, if I look at CPU usage I'll see that this program is using 100% of CPU (100% means it is using 1 core of the CPU 100% of the time) Sounds about right?

championswimmer's tweet photo. Let's have some fun with concurrency.
Here is some example Go code

Basically just calculates the time taken to run a loop and prints it.
To slow down the loop, I calculate the time after every 10000 iterations, and in every iteration I divide two random numbers.

And this is what the output looks like. About ~150us per printed everytime I calculate.

When this runs, if I look at CPU usage I'll see that this program is using 100% of CPU (100% means it is using 1 core of the CPU 100% of the time)

Sounds about right?

championswimmer's tweet photo. Let's have some fun with concurrency.
Here is some example Go code

Basically just calculates the time taken to run a loop and prints it.
To slow down the loop, I calculate the time after every 10000 iterations, and in every iteration I divide two random numbers.

And this is what the output looks like. About ~150us per printed everytime I calculate.

When this runs, if I look at CPU usage I'll see that this program is using 100% of CPU (100% means it is using 1 core of the CPU 100% of the time)

Sounds about right?

championswimmer's tweet photo. Let's have some fun with concurrency.
Here is some example Go code

Basically just calculates the time taken to run a loop and prints it.
To slow down the loop, I calculate the time after every 10000 iterations, and in every iteration I divide two random numbers.

And this is what the output looks like. About ~150us per printed everytime I calculate.

When this runs, if I look at CPU usage I'll see that this program is using 100% of CPU (100% means it is using 1 core of the CPU 100% of the time)

Sounds about right?

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Amod Malviya @amodm

over 4 years ago

Full list of my #WeekendDevPuzzle series: https://t.co/bs1yyHyy6m

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Amod Malviya @amodm

over 4 years ago

My (delayed) response to the last puzzle in this series.I'll be pausing #WeekendDevPuzzle for now, until I build a good pipeline again. https://t.co/iB2a7yuVuf *You can find the full list of puzzles here: https://t.co/bs1yyHyy6m

Amod Malviya @amodm

over 4 years ago

Today's #WeekendDevPuzzle: You've written code to play an arcade style space shooter game on a computer. You put sensors to observe the screen & feed data to your program, which then sends signals to kb+mouse. As speed of the game increases, what would become a bottleneck? 1/2

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Amod Malviya @amodm

over 4 years ago

Today's #WeekendDevPuzzle: You've written code to play an arcade style space shooter game on a computer. You put sensors to observe the screen & feed data to your program, which then sends signals to kb+mouse. As speed of the game increases, what would become a bottleneck? 1/2

Amod Malviya @amodm

over 4 years ago

In today's #WeekendDevPuzzle: You have a program that iterates over an (unordered) array of integers, to count how many of them are below a certain threshold. Pretty straight logic. Both the array and and the threshold are provided at runtime (so, not hardcoded). 1/3

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Amod Malviya @amodm

over 4 years ago

In today's #WeekendDevPuzzle: You have a program that iterates over an (unordered) array of integers, to count how many of them are below a certain threshold. Pretty straight logic. Both the array and and the threshold are provided at runtime (so, not hardcoded). 1/3

Amod Malviya @amodm

over 4 years ago

We'll keep today's #WeekendDevPuzzle simple: Scenario A: You have a set of web servers, sitting behind an LB (Load Balancer), and hit a DB for some of their requests. LB has never gone down since deployment, while web servers have issues for ~3hrs per month, and DB ~1hr/mo 1/4

amodm's tweet photo. We'll keep today's #WeekendDevPuzzle simple:

Scenario A: You have a set of web servers, sitting behind an LB (Load Balancer), and hit a DB for some of their requests.

LB has never gone down since deployment, while web servers have issues for ~3hrs per month, and DB ~1hr/mo

1/4 https://t.co/xlyKA0KRcx

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Amod Malviya @amodm

over 4 years ago

We'll keep today's #WeekendDevPuzzle simple: Scenario A: You have a set of web servers, sitting behind an LB (Load Balancer), and hit a DB for some of their requests. LB has never gone down since deployment, while web servers have issues for ~3hrs per month, and DB ~1hr/mo 1/4

amodm's tweet photo. We'll keep today's #WeekendDevPuzzle simple:

Scenario A: You have a set of web servers, sitting behind an LB (Load Balancer), and hit a DB for some of their requests.

LB has never gone down since deployment, while web servers have issues for ~3hrs per month, and DB ~1hr/mo

1/4 https://t.co/xlyKA0KRcx

Amod Malviya @amodm

over 4 years ago

In today's #WeekendDevPuzzle: Most modern programming languages have something called a "closure", usually closely coupled with lambda functions. Can closures+lambdas be implemented irrespective of whether the language is garbage collected or not? Why/not? 1/3

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Amod Malviya @amodm

over 4 years ago

In today's #WeekendDevPuzzle: Most modern programming languages have something called a "closure", usually closely coupled with lambda functions. Can closures+lambdas be implemented irrespective of whether the language is garbage collected or not? Why/not? 1/3

Amod Malviya @amodm

over 4 years ago

Today's #WeekendDevPuzzle: You've attached a debugger to your pre-running program and set a breakpoint, but your debugger crashed before it was hit. What happens to your program & why? If your answer is "it depends", then on what? 1/2

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Amod Malviya @amodm

over 4 years ago

Today's #WeekendDevPuzzle: You've attached a debugger to your pre-running program and set a breakpoint, but your debugger crashed before it was hit. What happens to your program & why? If your answer is "it depends", then on what? 1/2

Amod Malviya @amodm

over 4 years ago

No #WeekendDevPuzzle for this week as I’m traveling.

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Amod Malviya @amodm

over 4 years ago

No #WeekendDevPuzzle for this week as I’m traveling.

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Ram Parameswaran

over 4 years ago

Absolutely love the #WeekendDevPuzzle from @amodm - what a great hiring technique.

Amod Malviya @amodm

over 4 years ago

Today's #WeekendDevPuzzle is a short one, given the holidays. While a CPU is waiting for data to load from RAM, is it seen as idle or busy by the OS? How does the "uptime" command in the unix world see this? Bonus qstn: Implication of the above on Apple M1 Max Pro's performance?

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Amod Malviya @amodm

over 4 years ago

In today's #WeekendDevPuzzle: what's your guess at relative CPU performance of a process running A. natively B. in a docker container on the same host C. in a virtual machine on the same host How would you compare their network performance? Memory performance? 1/2

Amod Malviya @amodm

over 4 years ago

Today's #WeekendDevPuzzle is a short one, given the holidays. While a CPU is waiting for data to load from RAM, is it seen as idle or busy by the OS? How does the "uptime" command in the unix world see this? Bonus qstn: Implication of the above on Apple M1 Max Pro's performance?

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Amod Malviya @amodm

over 4 years ago

Today's #WeekendDevPuzzle is a short one, given the holidays. While a CPU is waiting for data to load from RAM, is it seen as idle or busy by the OS? How does the "uptime" command in the unix world see this? Bonus qstn: Implication of the above on Apple M1 Max Pro's performance?

Amod Malviya @amodm

over 4 years ago

In today's #WeekendDevPuzzle: You're building a JWT token issuer, which uses random numbers for some of its activities. The process will run on a Linux VM in the cloud, which runs no other server process. 1/2

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Amod Malviya @amodm

over 4 years ago

In today's #WeekendDevPuzzle: You're building a JWT token issuer, which uses random numbers for some of its activities. The process will run on a Linux VM in the cloud, which runs no other server process. 1/2

Amod Malviya @amodm

over 4 years ago

In today's #WeekendDevPuzzle: You've been asked to sum a series of numbers in a matrix of 10k rows and 20k cols (each cell is int64). Which is faster? 1. Adding up the 3rd cell in each row? 2. Adding up the 5th row? Depends on implementation? What factors determine outcome?

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Amod Malviya @amodm

over 4 years ago

In today's #WeekendDevPuzzle: You've been asked to sum a series of numbers in a matrix of 10k rows and 20k cols (each cell is int64). Which is faster? 1. Adding up the 3rd cell in each row? 2. Adding up the 5th row? Depends on implementation? What factors determine outcome?

Amod Malviya @amodm

over 4 years ago

In today's weekend dev puzzle: on what kind of code flows (or operations) specifically, do you believe a JIT JVM will perform better than a precompiled C code. Both running on x64. You don't have to send me answers, but do share if you enjoyed mulling over this.

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